chore(master): release 1.5.2

fix: tab characters breaking the layout
build: use reusable go-release workflow
2026-05-18 01:29:05 +00:00 · 2026-01-24 02:05:28 +02:00 · 2026-01-24 02:03:50 +02:00 · 2026-01-22 23:21:49 +02:00 · 2026-01-22 21:26:42 +02:00 · 2026-01-07 22:57:55 +02:00
17 changed files with 2481 additions and 413 deletions
--- a/.editorconfig
+++ b/.editorconfig
@@ -0,0 +1,4 @@
+[Makefile]
+indent_style = tab
+indent_size = 4
+tab_width = 4
--- a/.github/workflows/manual-homebrew-release.yml
+++ b/.github/workflows/manual-homebrew-release.yml
@@ -15,12 +15,19 @@ jobs:
      - name: Checkout repository
        uses: actions/checkout@v4

-      - name: Get latest tag
+      - name: Get latest release info
        id: latest
        run: |
          tag=$(gh release view --json tagName -q .tagName)
          echo "Latest release tag: $tag"
          echo "tag=$tag" >> "$GITHUB_OUTPUT"
+
+          # Get release body and escape for JSON
+          body=$(gh release view --json body -q .body)
+          # Use delimiter for multiline output
+          echo "body<<EOF" >> "$GITHUB_OUTPUT"
+          echo "$body" >> "$GITHUB_OUTPUT"
+          echo "EOF" >> "$GITHUB_OUTPUT"
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

@@ -30,7 +37,16 @@ jobs:
        run: |
          tag="${{ steps.latest.outputs.tag }}"
          repo="${{ github.event.repository.name }}"
-          data="{\"event_type\":\"trigger-from-release\",\"client_payload\":{\"tag\":\"$tag\",\"repo\":\"$repo\"}}"
+          # Use jq to properly escape the body for JSON
+          body=$(cat <<'BODY_EOF'
+          ${{ steps.latest.outputs.body }}
+          BODY_EOF
+          )
+          data=$(jq -n \
+            --arg tag "$tag" \
+            --arg repo "$repo" \
+            --arg body "$body" \
+            '{event_type: "trigger-from-release", client_payload: {tag: $tag, repo: $repo, body: $body}}')
          echo "Dispatching tag $tag from $repo"
          echo "Data: $data"
          curl -X POST \
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -11,114 +11,10 @@ permissions:
  pull-requests: write

 jobs:
-  test:
-    name: Test
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Set up Go
-        uses: actions/setup-go@v4
-        with:
-          go-version: '1.23'
-      - name: Test
-        run: go test -v ./...
-
-  generate:
-    name: Build for ${{ matrix.platform }}
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        include:
-          - platform: linux/amd64
-            label: linux-amd64
-          - platform: darwin/amd64
-            label: darwin-amd64
-          - platform: darwin/arm64
-            label: darwin-arm64
-          - platform: windows/amd64
-            label: windows-amd64
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Build for ${{ matrix.label }}
-        uses: chenasraf/go-cross-build@v1
-        with:
-          platforms: ${{ matrix.platform }}
-          package: ''
-          name: 'watchr'
-          compress: 'true'
-          dest: dist
-
-      - name: Upload build
-        uses: actions/upload-artifact@v4
-        with:
-          name: "dist-${{ matrix.label }}"
-          path: dist
-
-  release-please:
-    name: Release
-    if: github.ref == 'refs/heads/master'
-    runs-on: ubuntu-latest
-    outputs:
-      release_created: ${{ steps.release.outputs.release_created }}
-      tag_name: ${{ steps.release.outputs.tag_name }}
-    needs:
-      - test
-      - generate
-    steps:
-      - name: Checkout repository
-        uses: actions/checkout@v4
-
-      - name: Download all builds
-        uses: actions/download-artifact@v4
-        with:
-          path: dist
-
-      - name: Verify Release Artifacts
-        run: |
-          ls -la dist
-          for i in "linux-amd64" "darwin-amd64" "windows-amd64" "darwin-arm64"; do
-            if [[ ! -f ./dist/dist-$i/watchr-$i.tar.gz ]]; then
-              echo "File not found: ./dist/dist-$i/watchr-$i.tar.gz"
-              exit 1
-            fi
-          done
-
-      - name: Run Release Please
-        uses: googleapis/release-please-action@v4
-        id: release
-        with:
-          release-type: simple
-
-      - name: Upload Release Artifacts
-        if: ${{ steps.release.outputs.release_created }}
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        run: |
-          for i in "linux-amd64" "darwin-amd64" "darwin-arm64" "windows-amd64"; do
-            gh release upload "${{ steps.release.outputs.tag_name }}" "./dist/dist-$i/watchr-$i.tar.gz"
-          done
-
-  release-homebrew:
-    name: Homebrew Release
-    needs: [release-please]
-    if: ${{ needs.release-please.outputs.release_created }}
-    runs-on: ubuntu-latest
-    steps:
-      - name: Send dispatch to homebrew-tap
-        env:
-          GH_TOKEN: ${{ secrets.REPO_DISPATCH_PAT }}
-        run: |
-          repo="${{ github.event.repository.name }}"
-          tag="${{ needs.release-please.outputs.tag_name }}"
-          data="{\"event_type\":\"trigger-from-release\",\"client_payload\":{\"tag\":\"$tag\",\"repo\":\"$repo\"}}"
-          echo "Dispatching tag $tag from $repo"
-          echo "Data: $data"
-          curl -X POST \
-            -H "Accept: application/vnd.github+json" \
-            -H "Authorization: Bearer $GH_TOKEN" \
-            https://api.github.com/repos/chenasraf/homebrew-tap/dispatches \
-            -d "$data"
-          echo "Dispatched tag $tag from $repo"
-          echo "Created job on https://github.com/chenasraf/homebrew-tap/actions"
+  release:
+    uses: chenasraf/workflows/.github/workflows/go-release.yml@master
+    with:
+      name: watchr
+      homebrew-tap-repo: chenasraf/homebrew-tap
+    secrets:
+      REPO_DISPATCH_PAT: ${{ secrets.REPO_DISPATCH_PAT }}
--- a/.golangci.yml
+++ b/.golangci.yml
@@ -0,0 +1,12 @@
+version: "2"
+
+linters:
+  enable:
+    - staticcheck
+    - govet
+    - errcheck
+    - ineffassign
+    - unused
+    - gocritic
+    - intrange
+    - modernize
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,66 @@
 # Changelog

+## [1.5.2](https://github.com/chenasraf/watchr/compare/v1.5.1...v1.5.2) (2026-01-24)
+
+
+### Bug Fixes
+
+* tab characters breaking the layout ([c09d3e4](https://github.com/chenasraf/watchr/commit/c09d3e41ddd69c44ea0546cb0608abe8b0c50334))
+
+## [1.5.1](https://github.com/chenasraf/watchr/compare/v1.5.0...v1.5.1) (2025-12-31)
+
+
+### Bug Fixes
+
+* esc button behavior ([5703a61](https://github.com/chenasraf/watchr/commit/5703a61ddb3ee25e58470c537d53bf4a463bc632))
+
+## [1.5.0](https://github.com/chenasraf/watchr/compare/v1.4.0...v1.5.0) (2025-12-14)
+
+
+### Features
+
+* add more refresh duration options & formats ([f15b9e2](https://github.com/chenasraf/watchr/commit/f15b9e255988b5b754c377e3ae29f9eb4c8a1925))
+
+## [1.4.0](https://github.com/chenasraf/watchr/compare/v1.3.0...v1.4.0) (2025-12-08)
+
+
+### Features
+
+* add -i/--interactive mode ([9ecf9f7](https://github.com/chenasraf/watchr/commit/9ecf9f74b7e8271dc8f8d2e6e2fc562e87be9953))
+* add spinning loader animation ([ed2f24c](https://github.com/chenasraf/watchr/commit/ed2f24c0e820ebaa37f46cc2407648c3e8b1cbbd))
+* properly support streaming commands ([66c6599](https://github.com/chenasraf/watchr/commit/66c65995068181d4b4ae74087eb0c15e1ab0edb4))
+
+## [1.3.0](https://github.com/chenasraf/watchr/compare/v1.2.0...v1.3.0) (2025-12-04)
+
+
+### Features
+
+* add exit status to command header ([51b9e92](https://github.com/chenasraf/watchr/commit/51b9e92ddd9766d109429878cc706761e1f46e47))
+* help overlay window ([cdd895d](https://github.com/chenasraf/watchr/commit/cdd895d19ac78b3bc34ccde7da9f2136b6661abd))
+
+
+### Bug Fixes
+
+* current line style ([5e1b807](https://github.com/chenasraf/watchr/commit/5e1b8071054c9727a5a8c3db85c88e1ede8e27d0))
+
+## [1.2.0](https://github.com/chenasraf/watchr/compare/v1.1.0...v1.2.0) (2025-12-03)
+
+
+### Features
+
+* add --config/-c argument ([ab94ceb](https://github.com/chenasraf/watchr/commit/ab94ceb228ec59135d103b4f4cf3c1e391e82304))
+* add --show-config/-C argument ([c9affe8](https://github.com/chenasraf/watchr/commit/c9affe8375c60531d7489f937ab5aec4d9c73811))
+* update ui with panes & borders ([2d76e43](https://github.com/chenasraf/watchr/commit/2d76e4351968670339e9518b9a74c207a5600de8))
+* yank line ([2619708](https://github.com/chenasraf/watchr/commit/261970824412b32cfbbe46f642fb25864fa07510))
+
+## [1.1.0](https://github.com/chenasraf/watchr/compare/v1.0.1...v1.1.0) (2025-12-03)
+
+
+### Features
+
+* global/project-local config files ([9353705](https://github.com/chenasraf/watchr/commit/9353705f5291584452fd0403575211b16f3c0cd2))
+* support fixed/percent preview sizes ([c2b0bc5](https://github.com/chenasraf/watchr/commit/c2b0bc51d0f9bbc0f9bb8bd449c00c2cf9ad89b5))
+
 ## [1.0.1](https://github.com/chenasraf/watchr/compare/v1.0.0...v1.0.1) (2025-12-03)


--- a/22
+++ b/22
@@ -1,12 +1,19 @@
-all: run
+BIN := $(notdir $(CURDIR))
+
+all:
+	@if [ ! -f ".git/hooks/pre-commit" ]; then \
+		$(MAKE) precommit-install; \
+	fi
+	$(MAKE) build
+	$(MAKE) run

 .PHONY: build
 build:
-	go build
+	go build -o $(BIN)

 .PHONY: run
 run: build
-	./watchr
+	./$(BIN)

 .PHONY: test
 test:
@@ -14,11 +21,15 @@ test:

 .PHONY: install
 install: build
-	cp watchr ~/.local/bin
+	cp $(BIN) ~/.local/bin/

 .PHONY: uninstall
 uninstall:
-	rm -f ~/.local/bin/watchr
+	rm -f ~/.local/bin/$(BIN)
+
+.PHONY: lint
+lint:
+	golangci-lint run ./...

 .PHONY: precommit-install
 precommit-install:
@@ -33,6 +44,7 @@ precommit:
 	if [ -z "$$STAGED_FILES" ]; then \
 		echo "No staged Go files to check."; \
 	else \
+		set -e; \
 		echo "Running pre-commit checks..."; \
 		echo "go fmt"; \
 		go fmt ./...; \
--- a/README.md
+++ b/README.md
@@ -16,6 +16,7 @@ provides vim-style navigation, filtering, and a preview pane—all without leavi
 - **Preview pane**: Toggle a preview panel (bottom, top, left, or right)
 - **Auto-refresh**: Optionally re-run commands at specified intervals
 - **Line numbers**: Optional line numbering with configurable width
+- **Config files**: YAML, TOML, or JSON config files for persistent settings
 - **Full-screen TUI**: Clean, distraction-free interface using your entire terminal

 ---
@@ -75,6 +76,18 @@ watchr "ps aux"
 # Refresh every 2 seconds
 watchr -r 2 "docker ps"

+# Refresh every 500 milliseconds
+watchr -r 500ms "date"
+
+# Refresh every 1.5 seconds
+watchr -r 1.5s "kubectl get pods"
+
+# Refresh every 5 minutes
+watchr -r 5m "df -h"
+
+# Refresh every hour
+watchr -r 1h "curl -s https://api.example.com/status"
+
 # Watch file changes
 watchr -r 5 "find . -name '*.go' -mmin -1"
 ```
@@ -85,19 +98,89 @@ watchr -r 5 "find . -name '*.go' -mmin -1"
 Usage: watchr [options] <command to run>

 Options:
-  -h, --help                      Show help
-  -v, --version                   Show version
-  -r, --refresh int               Auto-refresh interval in seconds (0 = disabled)
-  -p, --prompt string             Prompt string (default "watchr> ")
-  -s, --shell string              Shell to use for executing commands (default "sh")
-  -n, --no-line-numbers           Disable line numbers
-  -w, --line-width int            Line number width (default 6)
-  -P, --preview-height int        Preview window height/width percentage (default 40)
-      --preview-position string   Preview position: bottom, top, left, right (default "bottom")
+  -h, --help                       Show help
+  -v, --version                    Show version
+  -c, --config string              Load config from specified path
+  -C, --show-config                Show loaded configuration and exit
+  -r, --refresh string             Auto-refresh interval (e.g., 1, 1.5, 500ms, 2s, 5m, 1h; default unit: seconds, 0 = disabled)
+  -p, --prompt string              Prompt string (default "watchr> ")
+  -s, --shell string               Shell to use for executing commands (default "sh")
+  -n, --no-line-numbers            Disable line numbers
+  -w, --line-width int             Line number width (default 6)
+  -P, --preview-size string        Preview size: number for lines/cols, or number% for percentage (default "40%")
+  -o, --preview-position string    Preview position: bottom, top, left, right (default "bottom")
+  -i, --interactive                Run shell in interactive mode (sources ~/.bashrc, ~/.zshrc, etc.)
 ```

 ---

+## 📁 Configuration File
+
+`watchr` supports configuration files in YAML, TOML, or JSON format. Settings in config files serve as defaults that can be overridden by command-line flags.
+
+### Config File Locations
+
+Config files are searched in the following order (later files override earlier ones):
+
+1. **XDG config directory** (Linux/macOS): `~/.config/watchr/watchr.{yaml,toml,json}`
+2. **Windows**: `%APPDATA%\watchr\watchr.{yaml,toml,json}`
+3. **Current directory** (project-local): `./watchr.{yaml,toml,json}`
+
+### Example Configurations
+
+**YAML** (`watchr.yaml`):
+```yaml
+shell: bash
+preview-size: "50%"
+preview-position: right
+line-numbers: true
+line-width: 4
+prompt: "> "
+refresh: 0           # disabled; or use: 2, 1.5, "500ms", "2s", "5m", "1h"
+interactive: false
+```
+
+**TOML** (`watchr.toml`):
+```toml
+shell = "bash"
+preview-size = "50%"
+preview-position = "right"
+line-numbers = true
+line-width = 4
+prompt = "> "
+refresh = 0          # disabled; or use: 2, 1.5, "500ms", "2s", "5m", "1h"
+interactive = false
+```
+
+**JSON** (`watchr.json`):
+```json
+{
+  "shell": "bash",
+  "preview-size": "50%",
+  "preview-position": "right",
+  "line-numbers": true,
+  "line-width": 4,
+  "prompt": "> ",
+  "refresh": 0,
+  "interactive": false
+}
+```
+
+The `refresh` option accepts:
+- Numbers: `2` or `1.5` (interpreted as seconds)
+- Explicit units: `"500ms"`, `"2s"`, `"5m"`, `"1h"`
+
+### Priority Order
+
+Configuration values are applied in this order (later sources override earlier ones):
+
+1. Built-in defaults
+2. XDG/system config file
+3. Project-local config file (current directory)
+4. Command-line flags
+
+---
+
 ## ⌨️ Keybindings

 | Key                | Action                          |
@@ -113,6 +196,8 @@ Options:
 | `p`                | Toggle preview pane             |
 | `/`                | Enter filter mode               |
 | `Esc`              | Exit filter mode / clear filter |
+| `y`                | Yank (copy) selected line       |
+| `?`                | Show help overlay               |

 ---

--- a/go.mod
+++ b/go.mod
@@ -8,6 +8,7 @@ require (
 	github.com/charmbracelet/bubbletea v1.3.10
 	github.com/charmbracelet/lipgloss v1.1.0
 	github.com/spf13/pflag v1.0.10
+	github.com/spf13/viper v1.21.0
 )

 require (
@@ -17,6 +18,8 @@ require (
 	github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd // indirect
 	github.com/charmbracelet/x/term v0.2.1 // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
+	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
 	github.com/lucasb-eyer/go-colorful v1.2.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
 	github.com/mattn/go-localereader v0.0.1 // indirect
@@ -24,8 +27,15 @@ require (
 	github.com/muesli/ansi v0.0.0-20230316100256-276c6243b2f6 // indirect
 	github.com/muesli/cancelreader v0.2.2 // indirect
 	github.com/muesli/termenv v0.16.0 // indirect
+	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/sagikazarmark/locafero v0.11.0 // indirect
+	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
+	github.com/spf13/afero v1.15.0 // indirect
+	github.com/spf13/cast v1.10.0 // indirect
+	github.com/subosito/gotenv v1.6.0 // indirect
 	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
 	golang.org/x/sys v0.36.0 // indirect
-	golang.org/x/text v0.3.8 // indirect
+	golang.org/x/text v0.28.0 // indirect
 )
--- a/go.sum
+++ b/go.sum
@@ -12,8 +12,22 @@ github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd h1:vy0G
 github.com/charmbracelet/x/cellbuf v0.0.13-0.20250311204145-2c3ea96c31dd/go.mod h1:xe0nKWGd3eJgtqZRaN9RjMtK7xUYchjzPr7q6kcvCCs=
 github.com/charmbracelet/x/term v0.2.1 h1:AQeHeLZ1OqSXhrAWpYUtZyX1T3zVxfpZuEQMIQaGIAQ=
 github.com/charmbracelet/x/term v0.2.1/go.mod h1:oQ4enTYFV7QN4m0i9mzHrViD7TQKvNEEkHUMCmsxdUg=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f h1:Y/CXytFA4m6baUTXGLOoWe4PQhGxaX0KpnayAqC48p4=
 github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f/go.mod h1:vw97MGsxSvLiUE2X8qFplwetxpGLQrlU1Q9AUEIzCaM=
+github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
+github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
+github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
+github.com/fsnotify/fsnotify v1.9.0/go.mod h1:8jBTzvmWwFyi3Pb8djgCCO5IBqzKJ/Jwo8TRcHyHii0=
+github.com/go-viper/mapstructure/v2 v2.4.0 h1:EBsztssimR/CONLSZZ04E8qAkxNYq4Qp9LvH92wZUgs=
+github.com/go-viper/mapstructure/v2 v2.4.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
+github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
+github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
+github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
+github.com/kr/pretty v0.3.1/go.mod h1:hoEshYVHaxMs3cyo3Yncou5ZscifuDolrwPKZanG3xk=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/lucasb-eyer/go-colorful v1.2.0 h1:1nnpGOrhyZZuNyfu1QjKiUICQ74+3FNCN69Aj6K7nkY=
 github.com/lucasb-eyer/go-colorful v1.2.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
@@ -28,18 +42,45 @@ github.com/muesli/cancelreader v0.2.2 h1:3I4Kt4BQjOR54NavqnDogx/MIoWBFa0StPA8ELU
 github.com/muesli/cancelreader v0.2.2/go.mod h1:3XuTXfFS2VjM+HTLZY9Ak0l6eUKfijIfMUZ4EgX0QYo=
 github.com/muesli/termenv v0.16.0 h1:S5AlUN9dENB57rsbnkPyfdGuWIlkmzJjbFf0Tf5FWUc=
 github.com/muesli/termenv v0.16.0/go.mod h1:ZRfOIKPFDYQoDFF4Olj7/QJbW60Ol/kL1pU3VfY/Cnk=
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--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -0,0 +1,208 @@
+package config
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"regexp"
+	"runtime"
+	"strconv"
+	"time"
+
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+// Config keys
+const (
+	KeyShell           = "shell"
+	KeyPreviewSize     = "preview-size"
+	KeyPreviewPosition = "preview-position"
+	KeyLineNumbers     = "line-numbers"
+	KeyLineWidth       = "line-width"
+	KeyPrompt          = "prompt"
+	KeyRefresh         = "refresh"
+	KeyInteractive     = "interactive"
+)
+
+// setDefaults sets the default configuration values.
+func setDefaults() {
+	viper.SetDefault(KeyShell, "sh")
+	viper.SetDefault(KeyPreviewSize, "40%")
+	viper.SetDefault(KeyPreviewPosition, "bottom")
+	viper.SetDefault(KeyLineNumbers, true)
+	viper.SetDefault(KeyLineWidth, 6)
+	viper.SetDefault(KeyPrompt, "watchr> ")
+	viper.SetDefault(KeyRefresh, "0")
+	viper.SetDefault(KeyInteractive, false)
+}
+
+// Init initializes Viper with config file paths and defaults.
+func Init() {
+	setDefaults()
+
+	// Config file name (without extension)
+	viper.SetConfigName("watchr")
+
+	// Add config paths in reverse priority order (last added = highest priority)
+	// 1. XDG config dir (lowest priority for files)
+	if configDir := getConfigDir(); configDir != "" {
+		watchrConfigDir := filepath.Join(configDir, "watchr")
+		viper.AddConfigPath(watchrConfigDir)
+	}
+
+	// 2. Current directory (highest priority for files)
+	viper.AddConfigPath(".")
+
+	// Try to read config file (errors are ignored if file doesn't exist)
+	_ = viper.ReadInConfig()
+}
+
+// InitWithFile initializes Viper with a specific config file path.
+func InitWithFile(path string) error {
+	setDefaults()
+
+	viper.SetConfigFile(path)
+	if err := viper.ReadInConfig(); err != nil {
+		return err
+	}
+	return nil
+}
+
+// BindFlags binds pflags to Viper. Should be called after flag definitions
+// but before accessing config values.
+func BindFlags(flags *pflag.FlagSet) {
+	// Bind each flag to its viper key
+	_ = viper.BindPFlag(KeyShell, flags.Lookup("shell"))
+	_ = viper.BindPFlag(KeyPreviewSize, flags.Lookup("preview-size"))
+	_ = viper.BindPFlag(KeyPreviewPosition, flags.Lookup("preview-position"))
+	_ = viper.BindPFlag(KeyLineWidth, flags.Lookup("line-width"))
+	_ = viper.BindPFlag(KeyPrompt, flags.Lookup("prompt"))
+	_ = viper.BindPFlag(KeyRefresh, flags.Lookup("refresh"))
+	_ = viper.BindPFlag(KeyInteractive, flags.Lookup("interactive"))
+
+	// line-numbers is inverted (no-line-numbers flag)
+	_ = viper.BindPFlag("no-line-numbers", flags.Lookup("no-line-numbers"))
+}
+
+// GetString returns a string config value.
+func GetString(key string) string {
+	return viper.GetString(key)
+}
+
+// GetInt returns an int config value.
+func GetInt(key string) int {
+	return viper.GetInt(key)
+}
+
+// GetBool returns a bool config value.
+func GetBool(key string) bool {
+	return viper.GetBool(key)
+}
+
+// ShowLineNumbers returns whether line numbers should be shown.
+// This handles the inverted no-line-numbers flag.
+func ShowLineNumbers() bool {
+	// If no-line-numbers flag is set, don't show line numbers
+	if viper.GetBool("no-line-numbers") {
+		return false
+	}
+	// Otherwise use the line-numbers config value
+	return viper.GetBool(KeyLineNumbers)
+}
+
+// ConfigFileUsed returns the config file path if one was loaded.
+func ConfigFileUsed() string {
+	return viper.ConfigFileUsed()
+}
+
+// PrintConfig prints the current configuration to stdout.
+func PrintConfig() {
+	configFile := ConfigFileUsed()
+	if configFile != "" {
+		fmt.Printf("Config file: %s\n\n", configFile)
+	} else {
+		fmt.Println("Config file: (none loaded)")
+	}
+
+	fmt.Println("Current configuration:")
+	fmt.Printf("  %-20s %s\n", KeyShell+":", GetString(KeyShell))
+	fmt.Printf("  %-20s %s\n", KeyPreviewSize+":", GetString(KeyPreviewSize))
+	fmt.Printf("  %-20s %s\n", KeyPreviewPosition+":", GetString(KeyPreviewPosition))
+	fmt.Printf("  %-20s %v\n", KeyLineNumbers+":", GetBool(KeyLineNumbers))
+	fmt.Printf("  %-20s %d\n", KeyLineWidth+":", GetInt(KeyLineWidth))
+	fmt.Printf("  %-20s %q\n", KeyPrompt+":", GetString(KeyPrompt))
+	fmt.Printf("  %-20s %s\n", KeyRefresh+":", GetString(KeyRefresh))
+	fmt.Printf("  %-20s %v\n", KeyInteractive+":", GetBool(KeyInteractive))
+}
+
+// getConfigDir returns the appropriate config directory for the OS.
+func getConfigDir() string {
+	switch runtime.GOOS {
+	case "windows":
+		return os.Getenv("APPDATA")
+	default:
+		// Use XDG_CONFIG_HOME if set, otherwise ~/.config
+		if xdg := os.Getenv("XDG_CONFIG_HOME"); xdg != "" {
+			return xdg
+		}
+		if home, err := os.UserHomeDir(); err == nil {
+			return filepath.Join(home, ".config")
+		}
+		return ""
+	}
+}
+
+// durationRegex matches duration strings like "1", "1.5", "500ms", "1s", "1.5s", "5m", "1h"
+var durationRegex = regexp.MustCompile(`^(\d+(?:\.\d+)?)(ms|s|m|h)?$`)
+
+// ParseDuration parses a duration string into a time.Duration.
+// Supported formats:
+//   - "1", "1.5" - interpreted as seconds (default unit)
+//   - "1s", "1.5s" - explicit seconds
+//   - "500ms", "1500ms" - explicit milliseconds
+//   - "5m", "1.5m" - explicit minutes
+//   - "1h", "0.5h" - explicit hours
+//
+// Returns 0 if the input is empty or "0".
+func ParseDuration(s string) (time.Duration, error) {
+	if s == "" || s == "0" {
+		return 0, nil
+	}
+
+	matches := durationRegex.FindStringSubmatch(s)
+	if matches == nil {
+		return 0, fmt.Errorf("invalid duration format: %q (expected number, Xms, Xs, Xm, or Xh)", s)
+	}
+
+	value, err := strconv.ParseFloat(matches[1], 64)
+	if err != nil {
+		return 0, fmt.Errorf("invalid duration value: %q", matches[1])
+	}
+
+	unit := matches[2]
+	switch unit {
+	case "ms":
+		return time.Duration(value * float64(time.Millisecond)), nil
+	case "s", "":
+		// Default to seconds
+		return time.Duration(value * float64(time.Second)), nil
+	case "m":
+		return time.Duration(value * float64(time.Minute)), nil
+	case "h":
+		return time.Duration(value * float64(time.Hour)), nil
+	default:
+		return 0, fmt.Errorf("invalid duration unit: %q", unit)
+	}
+}
+
+// GetDuration returns a duration config value by parsing the string value.
+// Returns 0 if parsing fails or value is empty.
+func GetDuration(key string) time.Duration {
+	s := viper.GetString(key)
+	d, err := ParseDuration(s)
+	if err != nil {
+		return 0
+	}
+	return d
+}
--- a/internal/config/config_test.go
+++ b/internal/config/config_test.go
@@ -0,0 +1,612 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+func resetViper() {
+	viper.Reset()
+}
+
+// isolateConfig sets up a clean environment for config tests by:
+// - Resetting viper
+// - Changing to a temp directory
+// - Setting XDG_CONFIG_HOME to the temp directory
+// Returns the temp directory path and a cleanup function.
+func isolateConfig(t *testing.T) (string, func()) {
+	t.Helper()
+	resetViper()
+
+	tmpDir := t.TempDir()
+	oldWd, _ := os.Getwd()
+	if err := os.Chdir(tmpDir); err != nil {
+		t.Fatalf("failed to change directory: %v", err)
+	}
+
+	oldXDG := os.Getenv("XDG_CONFIG_HOME")
+	_ = os.Setenv("XDG_CONFIG_HOME", tmpDir)
+
+	cleanup := func() {
+		_ = os.Chdir(oldWd)
+		_ = os.Setenv("XDG_CONFIG_HOME", oldXDG)
+	}
+
+	return tmpDir, cleanup
+}
+
+func TestInit(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	Init()
+
+	// Check defaults are set
+	if got := viper.GetString(KeyShell); got != "sh" {
+		t.Errorf("expected default shell 'sh', got %q", got)
+	}
+
+	if got := viper.GetString(KeyPreviewSize); got != "40%" {
+		t.Errorf("expected default preview-size '40%%', got %q", got)
+	}
+
+	if got := viper.GetString(KeyPreviewPosition); got != "bottom" {
+		t.Errorf("expected default preview-position 'bottom', got %q", got)
+	}
+
+	if got := viper.GetBool(KeyLineNumbers); got != true {
+		t.Errorf("expected default line-numbers true, got %v", got)
+	}
+
+	if got := viper.GetInt(KeyLineWidth); got != 6 {
+		t.Errorf("expected default line-width 6, got %d", got)
+	}
+
+	if got := viper.GetString(KeyPrompt); got != "watchr> " {
+		t.Errorf("expected default prompt 'watchr> ', got %q", got)
+	}
+
+	if got := viper.GetString(KeyRefresh); got != "0" {
+		t.Errorf("expected default refresh '0', got %q", got)
+	}
+}
+
+func TestGetters(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	Init()
+
+	if got := GetString(KeyShell); got != "sh" {
+		t.Errorf("GetString: expected 'sh', got %q", got)
+	}
+
+	if got := GetInt(KeyLineWidth); got != 6 {
+		t.Errorf("GetInt: expected 6, got %d", got)
+	}
+
+	if got := GetBool(KeyLineNumbers); got != true {
+		t.Errorf("GetBool: expected true, got %v", got)
+	}
+}
+
+func TestShowLineNumbers(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	Init()
+
+	// Default: line numbers enabled
+	if got := ShowLineNumbers(); got != true {
+		t.Errorf("expected ShowLineNumbers() true by default, got %v", got)
+	}
+
+	// When no-line-numbers is set
+	viper.Set("no-line-numbers", true)
+	if got := ShowLineNumbers(); got != false {
+		t.Errorf("expected ShowLineNumbers() false when no-line-numbers=true, got %v", got)
+	}
+
+	// Reset
+	viper.Set("no-line-numbers", false)
+	if got := ShowLineNumbers(); got != true {
+		t.Errorf("expected ShowLineNumbers() true when no-line-numbers=false, got %v", got)
+	}
+}
+
+func TestBindFlags(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	Init()
+
+	// Create a new flag set
+	flags := pflag.NewFlagSet("test", pflag.ContinueOnError)
+	flags.String("shell", "sh", "")
+	flags.String("preview-size", "40%", "")
+	flags.String("preview-position", "bottom", "")
+	flags.Int("line-width", 6, "")
+	flags.String("prompt", "watchr> ", "")
+	flags.String("refresh", "0", "")
+	flags.Bool("no-line-numbers", false, "")
+
+	// Parse with custom values
+	err := flags.Parse([]string{"--shell=bash", "--preview-size=50%", "--line-width=8"})
+	if err != nil {
+		t.Fatalf("failed to parse flags: %v", err)
+	}
+
+	// Bind flags
+	BindFlags(flags)
+
+	// Check that flag values override defaults
+	if got := GetString(KeyShell); got != "bash" {
+		t.Errorf("expected shell 'bash' from flag, got %q", got)
+	}
+
+	if got := GetString(KeyPreviewSize); got != "50%" {
+		t.Errorf("expected preview-size '50%%' from flag, got %q", got)
+	}
+
+	if got := GetInt(KeyLineWidth); got != 8 {
+		t.Errorf("expected line-width 8 from flag, got %d", got)
+	}
+
+	// Non-overridden values should still be defaults
+	if got := GetString(KeyPreviewPosition); got != "bottom" {
+		t.Errorf("expected preview-position 'bottom' (default), got %q", got)
+	}
+}
+
+func TestConfigFileLoading(t *testing.T) {
+	tmpDir, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	// Create a config file in the temp directory
+	configPath := filepath.Join(tmpDir, "watchr.yaml")
+	configContent := `shell: zsh
+preview-size: "60%"
+preview-position: right
+line-numbers: true
+line-width: 4
+prompt: "test> "
+refresh: 5
+`
+	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
+		t.Fatalf("failed to write config file: %v", err)
+	}
+
+	// Initialize config
+	Init()
+
+	// Check that config file values are loaded
+	if got := GetString(KeyShell); got != "zsh" {
+		t.Errorf("expected shell 'zsh' from config file, got %q", got)
+	}
+
+	if got := GetString(KeyPreviewSize); got != "60%" {
+		t.Errorf("expected preview-size '60%%' from config file, got %q", got)
+	}
+
+	if got := GetString(KeyPreviewPosition); got != "right" {
+		t.Errorf("expected preview-position 'right' from config file, got %q", got)
+	}
+
+	if got := GetInt(KeyLineWidth); got != 4 {
+		t.Errorf("expected line-width 4 from config file, got %d", got)
+	}
+
+	if got := GetString(KeyPrompt); got != "test> " {
+		t.Errorf("expected prompt 'test> ' from config file, got %q", got)
+	}
+
+	if got := GetDuration(KeyRefresh); got != 5*time.Second {
+		t.Errorf("expected refresh 5s from config file, got %v", got)
+	}
+
+	// ConfigFileUsed should return the path
+	if used := ConfigFileUsed(); used == "" {
+		t.Error("expected ConfigFileUsed() to return config file path")
+	}
+}
+
+func TestConfigFileWithFlags(t *testing.T) {
+	tmpDir, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	// Create a config file in the temp directory
+	configPath := filepath.Join(tmpDir, "watchr.yaml")
+	configContent := `shell: zsh
+preview-size: "60%"
+`
+	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
+		t.Fatalf("failed to write config file: %v", err)
+	}
+
+	// Initialize config
+	Init()
+
+	// Create flags and parse with override
+	flags := pflag.NewFlagSet("test", pflag.ContinueOnError)
+	flags.String("shell", "sh", "")
+	flags.String("preview-size", "40%", "")
+	flags.String("preview-position", "bottom", "")
+	flags.Int("line-width", 6, "")
+	flags.String("prompt", "watchr> ", "")
+	flags.String("refresh", "0", "")
+	flags.Bool("no-line-numbers", false, "")
+
+	// Override shell via flag
+	err := flags.Parse([]string{"--shell=bash"})
+	if err != nil {
+		t.Fatalf("failed to parse flags: %v", err)
+	}
+
+	BindFlags(flags)
+
+	// Flag should override config file
+	if got := GetString(KeyShell); got != "bash" {
+		t.Errorf("expected shell 'bash' (flag override), got %q", got)
+	}
+
+	// Config file value should be used when no flag override
+	if got := GetString(KeyPreviewSize); got != "60%" {
+		t.Errorf("expected preview-size '60%%' (from config file), got %q", got)
+	}
+
+	// Default should be used when not in config file and no flag
+	if got := GetString(KeyPreviewPosition); got != "bottom" {
+		t.Errorf("expected preview-position 'bottom' (default), got %q", got)
+	}
+}
+
+func TestGetConfigDir(t *testing.T) {
+	dir := getConfigDir()
+	if dir == "" {
+		t.Log("getConfigDir returned empty string (may be expected in some environments)")
+	} else {
+		t.Logf("getConfigDir returned: %s", dir)
+	}
+}
+
+func TestInitWithFile(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	// Create a config file
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "custom.yaml")
+	configContent := `shell: fish
+preview-size: "75%"
+preview-position: left
+line-numbers: false
+line-width: 8
+prompt: "custom> "
+refresh: 10
+`
+	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
+		t.Fatalf("failed to write config file: %v", err)
+	}
+
+	// Initialize with specific file
+	if err := InitWithFile(configPath); err != nil {
+		t.Fatalf("InitWithFile failed: %v", err)
+	}
+
+	// Check values from config file
+	if got := GetString(KeyShell); got != "fish" {
+		t.Errorf("expected shell 'fish', got %q", got)
+	}
+
+	if got := GetString(KeyPreviewSize); got != "75%" {
+		t.Errorf("expected preview-size '75%%', got %q", got)
+	}
+
+	if got := GetString(KeyPreviewPosition); got != "left" {
+		t.Errorf("expected preview-position 'left', got %q", got)
+	}
+
+	if got := GetBool(KeyLineNumbers); got != false {
+		t.Errorf("expected line-numbers false, got %v", got)
+	}
+
+	if got := GetInt(KeyLineWidth); got != 8 {
+		t.Errorf("expected line-width 8, got %d", got)
+	}
+
+	if got := GetString(KeyPrompt); got != "custom> " {
+		t.Errorf("expected prompt 'custom> ', got %q", got)
+	}
+
+	if got := GetDuration(KeyRefresh); got != 10*time.Second {
+		t.Errorf("expected refresh 10s, got %v", got)
+	}
+
+	// ConfigFileUsed should return the specified path
+	if used := ConfigFileUsed(); used != configPath {
+		t.Errorf("expected ConfigFileUsed() = %q, got %q", configPath, used)
+	}
+}
+
+func TestInitWithFileNotFound(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	err := InitWithFile("/nonexistent/path/config.yaml")
+	if err == nil {
+		t.Error("expected error for nonexistent file, got nil")
+	}
+}
+
+func TestInitWithFileTOML(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	// Create a TOML config file
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "config.toml")
+	configContent := `shell = "zsh"
+preview-size = "50%"
+preview-position = "top"
+`
+	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
+		t.Fatalf("failed to write config file: %v", err)
+	}
+
+	if err := InitWithFile(configPath); err != nil {
+		t.Fatalf("InitWithFile failed for TOML: %v", err)
+	}
+
+	if got := GetString(KeyShell); got != "zsh" {
+		t.Errorf("expected shell 'zsh', got %q", got)
+	}
+
+	if got := GetString(KeyPreviewPosition); got != "top" {
+		t.Errorf("expected preview-position 'top', got %q", got)
+	}
+}
+
+func TestInitWithFileJSON(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	// Create a JSON config file
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "config.json")
+	configContent := `{
+  "shell": "bash",
+  "preview-size": "30%",
+  "preview-position": "right"
+}`
+	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
+		t.Fatalf("failed to write config file: %v", err)
+	}
+
+	if err := InitWithFile(configPath); err != nil {
+		t.Fatalf("InitWithFile failed for JSON: %v", err)
+	}
+
+	if got := GetString(KeyShell); got != "bash" {
+		t.Errorf("expected shell 'bash', got %q", got)
+	}
+
+	if got := GetString(KeyPreviewSize); got != "30%" {
+		t.Errorf("expected preview-size '30%%', got %q", got)
+	}
+}
+
+func TestInitWithFileDefaults(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	// Create a config file with only some values
+	tmpDir := t.TempDir()
+	configPath := filepath.Join(tmpDir, "partial.yaml")
+	configContent := `shell: fish
+`
+	if err := os.WriteFile(configPath, []byte(configContent), 0644); err != nil {
+		t.Fatalf("failed to write config file: %v", err)
+	}
+
+	if err := InitWithFile(configPath); err != nil {
+		t.Fatalf("InitWithFile failed: %v", err)
+	}
+
+	// Specified value should be loaded
+	if got := GetString(KeyShell); got != "fish" {
+		t.Errorf("expected shell 'fish', got %q", got)
+	}
+
+	// Unspecified values should use defaults
+	if got := GetString(KeyPreviewSize); got != "40%" {
+		t.Errorf("expected default preview-size '40%%', got %q", got)
+	}
+
+	if got := GetString(KeyPreviewPosition); got != "bottom" {
+		t.Errorf("expected default preview-position 'bottom', got %q", got)
+	}
+
+	if got := GetInt(KeyLineWidth); got != 6 {
+		t.Errorf("expected default line-width 6, got %d", got)
+	}
+}
+
+func TestParseDuration(t *testing.T) {
+	tests := []struct {
+		input    string
+		expected time.Duration
+		wantErr  bool
+	}{
+		// Empty and zero values
+		{"", 0, false},
+		{"0", 0, false},
+
+		// Plain numbers (default to seconds)
+		{"1", 1 * time.Second, false},
+		{"5", 5 * time.Second, false},
+		{"60", 60 * time.Second, false},
+
+		// Decimal seconds
+		{"0.5", 500 * time.Millisecond, false},
+		{"1.5", 1500 * time.Millisecond, false},
+		{"2.25", 2250 * time.Millisecond, false},
+		{"0.1", 100 * time.Millisecond, false},
+		{"0.001", 1 * time.Millisecond, false},
+
+		// Explicit seconds suffix
+		{"1s", 1 * time.Second, false},
+		{"5s", 5 * time.Second, false},
+		{"0.5s", 500 * time.Millisecond, false},
+		{"1.5s", 1500 * time.Millisecond, false},
+
+		// Milliseconds suffix
+		{"100ms", 100 * time.Millisecond, false},
+		{"500ms", 500 * time.Millisecond, false},
+		{"1000ms", 1000 * time.Millisecond, false},
+		{"1500ms", 1500 * time.Millisecond, false},
+		{"50.5ms", 50500 * time.Microsecond, false},
+
+		// Minutes suffix
+		{"1m", 1 * time.Minute, false},
+		{"5m", 5 * time.Minute, false},
+		{"0.5m", 30 * time.Second, false},
+		{"1.5m", 90 * time.Second, false},
+
+		// Hours suffix
+		{"1h", 1 * time.Hour, false},
+		{"2h", 2 * time.Hour, false},
+		{"0.5h", 30 * time.Minute, false},
+		{"1.5h", 90 * time.Minute, false},
+
+		// Invalid formats
+		{"abc", 0, true},
+		{"1d", 0, true},  // days not supported
+		{"1w", 0, true},  // weeks not supported
+		{"-1", 0, true},  // negative not supported
+		{"-1s", 0, true}, // negative not supported
+		{"1.2.3", 0, true},
+		{"s", 0, true},
+		{"ms", 0, true},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.input, func(t *testing.T) {
+			got, err := ParseDuration(tt.input)
+			if tt.wantErr {
+				if err == nil {
+					t.Errorf("ParseDuration(%q) expected error, got nil", tt.input)
+				}
+				return
+			}
+			if err != nil {
+				t.Errorf("ParseDuration(%q) unexpected error: %v", tt.input, err)
+				return
+			}
+			if got != tt.expected {
+				t.Errorf("ParseDuration(%q) = %v, want %v", tt.input, got, tt.expected)
+			}
+		})
+	}
+}
+
+func TestGetDuration(t *testing.T) {
+	_, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	Init()
+
+	// Test default value
+	if got := GetDuration(KeyRefresh); got != 0 {
+		t.Errorf("expected default refresh 0, got %v", got)
+	}
+
+	// Test with seconds value
+	viper.Set(KeyRefresh, "5")
+	if got := GetDuration(KeyRefresh); got != 5*time.Second {
+		t.Errorf("expected refresh 5s, got %v", got)
+	}
+
+	// Test with decimal value
+	viper.Set(KeyRefresh, "0.5")
+	if got := GetDuration(KeyRefresh); got != 500*time.Millisecond {
+		t.Errorf("expected refresh 500ms, got %v", got)
+	}
+
+	// Test with explicit seconds suffix
+	viper.Set(KeyRefresh, "2s")
+	if got := GetDuration(KeyRefresh); got != 2*time.Second {
+		t.Errorf("expected refresh 2s, got %v", got)
+	}
+
+	// Test with milliseconds
+	viper.Set(KeyRefresh, "250ms")
+	if got := GetDuration(KeyRefresh); got != 250*time.Millisecond {
+		t.Errorf("expected refresh 250ms, got %v", got)
+	}
+
+	// Test with invalid value (should return 0)
+	viper.Set(KeyRefresh, "invalid")
+	if got := GetDuration(KeyRefresh); got != 0 {
+		t.Errorf("expected refresh 0 for invalid value, got %v", got)
+	}
+}
+
+func TestRefreshDurationFromConfigFile(t *testing.T) {
+	tmpDir, cleanup := isolateConfig(t)
+	defer cleanup()
+
+	tests := []struct {
+		name     string
+		yaml     string
+		expected time.Duration
+	}{
+		{
+			name:     "integer seconds",
+			yaml:     "refresh: 5\n",
+			expected: 5 * time.Second,
+		},
+		{
+			name:     "decimal seconds",
+			yaml:     "refresh: 0.5\n",
+			expected: 500 * time.Millisecond,
+		},
+		{
+			name:     "string with s suffix",
+			yaml:     "refresh: \"2s\"\n",
+			expected: 2 * time.Second,
+		},
+		{
+			name:     "string with ms suffix",
+			yaml:     "refresh: \"500ms\"\n",
+			expected: 500 * time.Millisecond,
+		},
+		{
+			name:     "string decimal with s suffix",
+			yaml:     "refresh: \"1.5s\"\n",
+			expected: 1500 * time.Millisecond,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			resetViper()
+
+			configPath := filepath.Join(tmpDir, "watchr.yaml")
+			if err := os.WriteFile(configPath, []byte(tt.yaml), 0644); err != nil {
+				t.Fatalf("failed to write config file: %v", err)
+			}
+
+			Init()
+
+			got := GetDuration(KeyRefresh)
+			if got != tt.expected {
+				t.Errorf("GetDuration(KeyRefresh) = %v, want %v", got, tt.expected)
+			}
+		})
+	}
+}
--- a/internal/runner/runner.go
+++ b/internal/runner/runner.go
@@ -5,11 +5,22 @@ import (
 	"context"
 	"fmt"
 	"io"
+	"os"
 	"os/exec"
+	"path/filepath"
 	"strings"
 	"sync"
 )

+// sanitizeLine removes control sequences that can corrupt terminal rendering
+func sanitizeLine(s string) string {
+	// Remove carriage returns
+	s = strings.ReplaceAll(s, "\r", "")
+	// Convert tabs to spaces (tabs cause width calculation issues)
+	s = strings.ReplaceAll(s, "\t", "        ")
+	return s
+}
+
 // Line represents a single line of output with its line number
 type Line struct {
 	Number  int
@@ -26,34 +37,109 @@ func (l Line) FormatLine(width int, showLineNum bool) string {

 // Runner executes commands and captures output
 type Runner struct {
-	Shell   string
-	Command string
+	Shell       string
+	Command     string
+	Interactive bool
 }

 // NewRunner creates a new Runner
 func NewRunner(shell, command string) *Runner {
 	return &Runner{
-		Shell:   shell,
-		Command: command,
+		Shell:       shell,
+		Command:     command,
+		Interactive: false,
 	}
 }

-// Run executes the command and returns output lines
-func (r *Runner) Run(ctx context.Context) ([]Line, error) {
-	cmd := exec.CommandContext(ctx, r.Shell, "-c", r.Command)
+// NewInteractiveRunner creates a new Runner that sources shell rc files
+func NewInteractiveRunner(shell, command string) *Runner {
+	return &Runner{
+		Shell:       shell,
+		Command:     command,
+		Interactive: true,
+	}
+}
+
+// buildCommand returns the shell arguments for executing the command.
+// If Interactive is true, it wraps the command to source the appropriate rc file.
+func (r *Runner) buildCommand() []string {
+	if !r.Interactive {
+		return []string{"-c", r.Command}
+	}
+
+	// For interactive mode, source the appropriate rc file before running the command
+	rcFile := r.getRCFile()
+	if rcFile != "" {
+		// Source the rc file if it exists, then run the command
+		wrappedCmd := fmt.Sprintf("[ -f %s ] && . %s; %s", rcFile, rcFile, r.Command)
+		return []string{"-c", wrappedCmd}
+	}
+
+	return []string{"-c", r.Command}
+}
+
+// getRCFile returns the path to the shell's rc file based on the shell being used.
+func (r *Runner) getRCFile() string {
+	home, err := os.UserHomeDir()
+	if err != nil {
+		return ""
+	}
+
+	shellBase := filepath.Base(r.Shell)
+	switch shellBase {
+	case "bash":
+		// Prefer .bashrc for interactive settings, fall back to .bash_profile
+		bashrc := filepath.Join(home, ".bashrc")
+		if _, err := os.Stat(bashrc); err == nil {
+			return bashrc
+		}
+		return filepath.Join(home, ".bash_profile")
+	case "zsh":
+		return filepath.Join(home, ".zshrc")
+	case "fish":
+		configDir := os.Getenv("XDG_CONFIG_HOME")
+		if configDir == "" {
+			configDir = filepath.Join(home, ".config")
+		}
+		return filepath.Join(configDir, "fish", "config.fish")
+	case "ksh":
+		return filepath.Join(home, ".kshrc")
+	case "sh":
+		// POSIX sh uses ENV variable or .profile
+		if env := os.Getenv("ENV"); env != "" {
+			return env
+		}
+		return filepath.Join(home, ".profile")
+	default:
+		// Try common patterns for unknown shells
+		return filepath.Join(home, "."+shellBase+"rc")
+	}
+}
+
+// Result contains the output and exit code of a command run
+type Result struct {
+	Lines    []Line
+	ExitCode int
+}
+
+// Run executes the command and returns output lines with exit code
+func (r *Runner) Run(ctx context.Context) (Result, error) {
+	args := r.buildCommand()
+	cmd := exec.CommandContext(ctx, r.Shell, args...)
+	cmd.Env = append(os.Environ(), "WATCHR=1")

 	stdout, err := cmd.StdoutPipe()
 	if err != nil {
-		return nil, fmt.Errorf("failed to create stdout pipe: %w", err)
+		return Result{}, fmt.Errorf("failed to create stdout pipe: %w", err)
 	}

 	stderr, err := cmd.StderrPipe()
 	if err != nil {
-		return nil, fmt.Errorf("failed to create stderr pipe: %w", err)
+		return Result{}, fmt.Errorf("failed to create stderr pipe: %w", err)
 	}

 	if err := cmd.Start(); err != nil {
-		return nil, fmt.Errorf("failed to start command: %w", err)
+		return Result{}, fmt.Errorf("failed to start command: %w", err)
 	}

 	var lines []Line
@@ -64,7 +150,7 @@ func (r *Runner) Run(ctx context.Context) ([]Line, error) {
 	for scanner.Scan() {
 		lines = append(lines, Line{
 			Number:  lineNum,
-			Content: scanner.Text(),
+			Content: sanitizeLine(scanner.Text()),
 		})
 		lineNum++
 	}
@@ -74,70 +160,156 @@ func (r *Runner) Run(ctx context.Context) ([]Line, error) {
 	for stderrScanner.Scan() {
 		lines = append(lines, Line{
 			Number:  lineNum,
-			Content: stderrScanner.Text(),
+			Content: sanitizeLine(stderrScanner.Text()),
 		})
 		lineNum++
 	}

-	// Wait for command to finish (ignore exit code - we still want to show output)
-	_ = cmd.Wait()
-
-	return lines, nil
-}
-
-// RunStreaming executes the command and streams output lines to the callback
-// The callback is called for each line as it arrives
-func (r *Runner) RunStreaming(ctx context.Context, lines *[]Line, mu *sync.RWMutex) error {
-	cmd := exec.CommandContext(ctx, r.Shell, "-c", r.Command)
-
-	stdout, err := cmd.StdoutPipe()
-	if err != nil {
-		return fmt.Errorf("failed to create stdout pipe: %w", err)
-	}
-
-	stderr, err := cmd.StderrPipe()
-	if err != nil {
-		return fmt.Errorf("failed to create stderr pipe: %w", err)
-	}
-
-	if err := cmd.Start(); err != nil {
-		return fmt.Errorf("failed to start command: %w", err)
-	}
-
-	lineNum := 1
-
-	// Read from both stdout and stderr concurrently
-	var wg sync.WaitGroup
-	wg.Add(2)
-
-	readPipe := func(pipe io.Reader) {
-		defer wg.Done()
-		scanner := bufio.NewScanner(pipe)
-		for scanner.Scan() {
-			mu.Lock()
-			*lines = append(*lines, Line{
-				Number:  lineNum,
-				Content: scanner.Text(),
-			})
-			lineNum++
-			mu.Unlock()
+	// Wait for command to finish and get exit code
+	exitCode := 0
+	if err := cmd.Wait(); err != nil {
+		if exitErr, ok := err.(*exec.ExitError); ok {
+			exitCode = exitErr.ExitCode()
 		}
 	}

-	go readPipe(stdout)
-	go readPipe(stderr)
+	return Result{Lines: lines, ExitCode: exitCode}, nil
+}

-	wg.Wait()
+// StreamingResult holds the state of a streaming command
+type StreamingResult struct {
+	Lines    *[]Line
+	ExitCode int
+	Done     bool
+	Error    error
+	mu       sync.RWMutex
+}

-	// Wait for command to finish (ignore exit code - we still want to show output)
-	_ = cmd.Wait()
+// GetLines returns a copy of the current lines (thread-safe)
+func (s *StreamingResult) GetLines() []Line {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	if s.Lines == nil {
+		return nil
+	}
+	result := make([]Line, len(*s.Lines))
+	copy(result, *s.Lines)
+	return result
+}

-	return nil
+// LineCount returns the current number of lines (thread-safe)
+func (s *StreamingResult) LineCount() int {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	if s.Lines == nil {
+		return 0
+	}
+	return len(*s.Lines)
+}
+
+// IsDone returns whether the command has finished (thread-safe)
+func (s *StreamingResult) IsDone() bool {
+	s.mu.RLock()
+	defer s.mu.RUnlock()
+	return s.Done
+}
+
+// RunStreaming executes the command and streams output lines in the background.
+// Returns a StreamingResult that can be polled for updates.
+// The command runs until ctx is cancelled or it completes naturally.
+func (r *Runner) RunStreaming(ctx context.Context) *StreamingResult {
+	result := &StreamingResult{
+		Lines:    &[]Line{},
+		ExitCode: -1,
+		Done:     false,
+	}
+
+	go func() {
+		args := r.buildCommand()
+		cmd := exec.CommandContext(ctx, r.Shell, args...)
+		cmd.Env = append(os.Environ(), "WATCHR=1")
+
+		stdout, err := cmd.StdoutPipe()
+		if err != nil {
+			result.mu.Lock()
+			result.Error = fmt.Errorf("failed to create stdout pipe: %w", err)
+			result.Done = true
+			result.mu.Unlock()
+			return
+		}
+
+		stderr, err := cmd.StderrPipe()
+		if err != nil {
+			result.mu.Lock()
+			result.Error = fmt.Errorf("failed to create stderr pipe: %w", err)
+			result.Done = true
+			result.mu.Unlock()
+			return
+		}
+
+		if err := cmd.Start(); err != nil {
+			result.mu.Lock()
+			result.Error = fmt.Errorf("failed to start command: %w", err)
+			result.Done = true
+			result.mu.Unlock()
+			return
+		}
+
+		lineNum := 1
+		var lineNumMu sync.Mutex
+
+		// Read from both stdout and stderr concurrently
+		var wg sync.WaitGroup
+		wg.Add(2)
+
+		readPipe := func(pipe io.Reader) {
+			defer wg.Done()
+			scanner := bufio.NewScanner(pipe)
+			for scanner.Scan() {
+				lineNumMu.Lock()
+				currentLineNum := lineNum
+				lineNum++
+				lineNumMu.Unlock()
+
+				result.mu.Lock()
+				*result.Lines = append(*result.Lines, Line{
+					Number:  currentLineNum,
+					Content: sanitizeLine(scanner.Text()),
+				})
+				result.mu.Unlock()
+			}
+		}
+
+		go readPipe(stdout)
+		go readPipe(stderr)
+
+		wg.Wait()
+
+		// Wait for command to finish and get exit code
+		exitCode := 0
+		if err := cmd.Wait(); err != nil {
+			if exitErr, ok := err.(*exec.ExitError); ok {
+				exitCode = exitErr.ExitCode()
+			} else if ctx.Err() != nil {
+				// Context was cancelled
+				exitCode = -1
+			}
+		}
+
+		result.mu.Lock()
+		result.ExitCode = exitCode
+		result.Done = true
+		result.mu.Unlock()
+	}()
+
+	return result
 }

 // RunSimple executes the command and returns output as string slice
 func (r *Runner) RunSimple(ctx context.Context) ([]string, error) {
-	cmd := exec.CommandContext(ctx, r.Shell, "-c", r.Command)
+	args := r.buildCommand()
+	cmd := exec.CommandContext(ctx, r.Shell, args...)
+	cmd.Env = append(os.Environ(), "WATCHR=1")
 	output, err := cmd.CombinedOutput()
 	if err != nil {
 		// Still return output even on error (non-zero exit)
--- a/internal/runner/runner_test.go
+++ b/internal/runner/runner_test.go
@@ -14,6 +14,97 @@ func TestNewRunner(t *testing.T) {
 	if r.Command != "echo hello" {
 		t.Errorf("expected command 'echo hello', got %q", r.Command)
 	}
+	if r.Interactive {
+		t.Errorf("expected Interactive to be false for NewRunner")
+	}
+}
+
+func TestNewInteractiveRunner(t *testing.T) {
+	r := NewInteractiveRunner("bash", "my_func")
+	if r.Shell != "bash" {
+		t.Errorf("expected shell 'bash', got %q", r.Shell)
+	}
+	if r.Command != "my_func" {
+		t.Errorf("expected command 'my_func', got %q", r.Command)
+	}
+	if !r.Interactive {
+		t.Errorf("expected Interactive to be true for NewInteractiveRunner")
+	}
+}
+
+func TestRunner_buildCommand(t *testing.T) {
+	tests := []struct {
+		name        string
+		shell       string
+		command     string
+		interactive bool
+		wantFirst   string
+	}{
+		{
+			name:        "non-interactive",
+			shell:       "sh",
+			command:     "echo hello",
+			interactive: false,
+			wantFirst:   "-c",
+		},
+		{
+			name:        "interactive bash",
+			shell:       "bash",
+			command:     "my_func",
+			interactive: true,
+			wantFirst:   "-c",
+		},
+		{
+			name:        "interactive zsh",
+			shell:       "/bin/zsh",
+			command:     "my_alias",
+			interactive: true,
+			wantFirst:   "-c",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			var r *Runner
+			if tt.interactive {
+				r = NewInteractiveRunner(tt.shell, tt.command)
+			} else {
+				r = NewRunner(tt.shell, tt.command)
+			}
+
+			args := r.buildCommand()
+			if len(args) != 2 {
+				t.Fatalf("expected 2 args, got %d", len(args))
+			}
+			if args[0] != tt.wantFirst {
+				t.Errorf("expected first arg %q, got %q", tt.wantFirst, args[0])
+			}
+
+			// For interactive mode, the command should contain sourcing logic
+			if tt.interactive {
+				if !contains(args[1], tt.command) {
+					t.Errorf("expected command %q to be in args[1] %q", tt.command, args[1])
+				}
+			} else {
+				if args[1] != tt.command {
+					t.Errorf("expected args[1] to be %q, got %q", tt.command, args[1])
+				}
+			}
+		})
+	}
+}
+
+func contains(s, substr string) bool {
+	return len(s) >= len(substr) && (s == substr || len(s) > 0 && containsHelper(s, substr))
+}
+
+func containsHelper(s, substr string) bool {
+	for i := 0; i <= len(s)-len(substr); i++ {
+		if s[i:i+len(substr)] == substr {
+			return true
+		}
+	}
+	return false
 }

 func TestRunner_Run(t *testing.T) {
@@ -52,17 +143,17 @@ func TestRunner_Run(t *testing.T) {
 			r := NewRunner(tt.shell, tt.command)
 			ctx := context.Background()

-			lines, err := r.Run(ctx)
+			result, err := r.Run(ctx)
 			if err != nil {
 				t.Fatalf("unexpected error: %v", err)
 			}

-			if len(lines) != tt.wantLines {
-				t.Errorf("expected %d lines, got %d", tt.wantLines, len(lines))
+			if len(result.Lines) != tt.wantLines {
+				t.Errorf("expected %d lines, got %d", tt.wantLines, len(result.Lines))
 			}

-			if tt.wantLines > 0 && lines[0].Content != tt.wantContent {
-				t.Errorf("expected first line %q, got %q", tt.wantContent, lines[0].Content)
+			if tt.wantLines > 0 && result.Lines[0].Content != tt.wantContent {
+				t.Errorf("expected first line %q, got %q", tt.wantContent, result.Lines[0].Content)
 			}
 		})
 	}
@@ -103,13 +194,17 @@ func TestRunner_RunWithFailingCommand(t *testing.T) {
 	ctx := context.Background()

 	// Should not return error for non-zero exit, just empty output
-	lines, err := r.Run(ctx)
+	result, err := r.Run(ctx)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}

-	if len(lines) != 0 {
-		t.Errorf("expected 0 lines for exit 1, got %d", len(lines))
+	if len(result.Lines) != 0 {
+		t.Errorf("expected 0 lines for exit 1, got %d", len(result.Lines))
+	}
+
+	if result.ExitCode != 1 {
+		t.Errorf("expected exit code 1, got %d", result.ExitCode)
 	}
 }

@@ -117,17 +212,21 @@ func TestRunner_RunWithOutputAndError(t *testing.T) {
 	r := NewRunner("sh", "echo 'output'; exit 1")
 	ctx := context.Background()

-	lines, err := r.Run(ctx)
+	result, err := r.Run(ctx)
 	if err != nil {
 		t.Fatalf("unexpected error: %v", err)
 	}

-	if len(lines) != 1 {
-		t.Fatalf("expected 1 line, got %d", len(lines))
+	if len(result.Lines) != 1 {
+		t.Fatalf("expected 1 line, got %d", len(result.Lines))
 	}

-	if lines[0].Content != "output" {
-		t.Errorf("expected 'output', got %q", lines[0].Content)
+	if result.Lines[0].Content != "output" {
+		t.Errorf("expected 'output', got %q", result.Lines[0].Content)
+	}
+
+	if result.ExitCode != 1 {
+		t.Errorf("expected exit code 1, got %d", result.ExitCode)
 	}
 }

@@ -221,3 +320,61 @@ func TestSplitLines(t *testing.T) {
 		})
 	}
 }
+
+func TestSanitizeLine(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{
+			name:  "plain text unchanged",
+			input: "hello world",
+			want:  "hello world",
+		},
+		{
+			name:  "tabs converted to spaces",
+			input: "col1\tcol2\tcol3",
+			want:  "col1        col2        col3",
+		},
+		{
+			name:  "carriage returns removed",
+			input: "line with\r\nwindows ending",
+			want:  "line with\nwindows ending",
+		},
+		{
+			name:  "carriage return only removed",
+			input: "progress\roverwrite",
+			want:  "progressoverwrite",
+		},
+		{
+			name:  "ANSI color codes preserved",
+			input: "\x1b[32mgreen text\x1b[0m",
+			want:  "\x1b[32mgreen text\x1b[0m",
+		},
+		{
+			name:  "mixed tabs and colors",
+			input: "\x1b[1m?\x1b[0m\tpackage\t[no test files]",
+			want:  "\x1b[1m?\x1b[0m        package        [no test files]",
+		},
+		{
+			name:  "empty string",
+			input: "",
+			want:  "",
+		},
+		{
+			name:  "multiple tabs",
+			input: "\t\t\t",
+			want:  "                        ",
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := sanitizeLine(tt.input)
+			if got != tt.want {
+				t.Errorf("sanitizeLine(%q) = %q, want %q", tt.input, got, tt.want)
+			}
+		})
+	}
+}
--- a/internal/ui/ui.go
+++ b/internal/ui/ui.go
--- a/internal/ui/ui_test.go
+++ b/internal/ui/ui_test.go
@@ -2,20 +2,22 @@ package ui

 import (
 	"testing"
+	"time"

 	"github.com/chenasraf/watchr/internal/runner"
 )

 func TestConfig(t *testing.T) {
 	cfg := Config{
-		Command:         "echo test",
-		Shell:           "sh",
-		PreviewHeight:   40,
-		PreviewPosition: PreviewBottom,
-		ShowLineNums:    true,
-		LineNumWidth:    6,
-		Prompt:          "watchr> ",
-		RefreshSeconds:  5,
+		Command:              "echo test",
+		Shell:                "sh",
+		PreviewSize:          40,
+		PreviewSizeIsPercent: true,
+		PreviewPosition:      PreviewBottom,
+		ShowLineNums:         true,
+		LineNumWidth:         6,
+		Prompt:               "watchr> ",
+		RefreshInterval:      5 * time.Second,
 	}

 	if cfg.Command != "echo test" {
@@ -26,8 +28,12 @@ func TestConfig(t *testing.T) {
 		t.Errorf("expected shell 'sh', got %q", cfg.Shell)
 	}

-	if cfg.PreviewHeight != 40 {
-		t.Errorf("expected preview height 40, got %d", cfg.PreviewHeight)
+	if cfg.PreviewSize != 40 {
+		t.Errorf("expected preview size 40, got %d", cfg.PreviewSize)
+	}
+
+	if !cfg.PreviewSizeIsPercent {
+		t.Error("expected PreviewSizeIsPercent to be true")
 	}

 	if cfg.PreviewPosition != PreviewBottom {
@@ -46,8 +52,8 @@ func TestConfig(t *testing.T) {
 		t.Errorf("expected prompt 'watchr> ', got %q", cfg.Prompt)
 	}

-	if cfg.RefreshSeconds != 5 {
-		t.Errorf("expected refresh seconds 5, got %d", cfg.RefreshSeconds)
+	if cfg.RefreshInterval != 5*time.Second {
+		t.Errorf("expected refresh interval 5s, got %v", cfg.RefreshInterval)
 	}
 }

@@ -81,8 +87,12 @@ func TestConfigDefaults(t *testing.T) {
 		t.Errorf("expected empty shell, got %q", cfg.Shell)
 	}

-	if cfg.PreviewHeight != 0 {
-		t.Errorf("expected preview height 0, got %d", cfg.PreviewHeight)
+	if cfg.PreviewSize != 0 {
+		t.Errorf("expected preview size 0, got %d", cfg.PreviewSize)
+	}
+
+	if cfg.PreviewSizeIsPercent {
+		t.Error("expected PreviewSizeIsPercent to be false")
 	}

 	if cfg.PreviewPosition != "" {
@@ -104,13 +114,14 @@ func TestConfigDefaults(t *testing.T) {

 func TestInitialModel(t *testing.T) {
 	cfg := Config{
-		Command:         "echo test",
-		Shell:           "sh",
-		PreviewHeight:   40,
-		PreviewPosition: PreviewBottom,
-		ShowLineNums:    true,
-		LineNumWidth:    6,
-		Prompt:          "watchr> ",
+		Command:              "echo test",
+		Shell:                "sh",
+		PreviewSize:          40,
+		PreviewSizeIsPercent: true,
+		PreviewPosition:      PreviewBottom,
+		ShowLineNums:         true,
+		LineNumWidth:         6,
+		Prompt:               "watchr> ",
 	}

 	m := initialModel(cfg)
@@ -232,29 +243,44 @@ func TestModelMoveCursor(t *testing.T) {

 func TestVisibleLines(t *testing.T) {
 	cfg := Config{
-		Command:         "echo test",
-		Shell:           "sh",
-		PreviewHeight:   40,
-		PreviewPosition: PreviewBottom,
+		Command:              "echo test",
+		Shell:                "sh",
+		PreviewSize:          40,
+		PreviewSizeIsPercent: true,
+		PreviewPosition:      PreviewBottom,
 	}

 	m := initialModel(cfg)
 	m.height = 100

+	// Fixed lines: top border (1) + header (1) + separator (1) + bottom border (1) + prompt (1) = 5
+	fixedLines := 5
+
 	// Without preview
 	m.showPreview = false
 	visible := m.visibleLines()
-	expected := 100 - 3 // height - header
+	expected := 100 - fixedLines
 	if visible != expected {
 		t.Errorf("expected %d visible lines without preview, got %d", expected, visible)
 	}

-	// With preview at bottom
+	// With preview at bottom (percentage)
 	m.showPreview = true
 	visible = m.visibleLines()
 	previewHeight := 100 * 40 / 100 // 40%
-	expected = 100 - 3 - previewHeight
+	// Add 1 for the separator between content and preview
+	expected = 100 - fixedLines - previewHeight - 1
 	if visible != expected {
 		t.Errorf("expected %d visible lines with preview, got %d", expected, visible)
 	}
+
+	// With preview using absolute size
+	m.config.PreviewSizeIsPercent = false
+	m.config.PreviewSize = 10
+	visible = m.visibleLines()
+	// Add 1 for the separator between content and preview
+	expected = 100 - fixedLines - 10 - 1
+	if visible != expected {
+		t.Errorf("expected %d visible lines with absolute preview size, got %d", expected, visible)
+	}
 }
--- a/main.go
+++ b/main.go
@@ -4,8 +4,10 @@ import (
 	_ "embed"
 	"fmt"
 	"os"
+	"strconv"
 	"strings"

+	"github.com/chenasraf/watchr/internal/config"
 	"github.com/chenasraf/watchr/internal/ui"
 	flag "github.com/spf13/pflag"
 )
@@ -15,45 +17,46 @@ var version string

 func main() {
 	var (
-		showVersion     bool
-		showHelp        bool
-		previewHeight   int
-		previewPosition string
-		noLineNumbers   bool
-		lineNumWidth    int
-		prompt          string
-		shell           string
-		refreshSeconds  int
+		showVersion bool
+		showHelp    bool
+		showConfig  bool
+		configFile  string
 	)

+	// Define flags (defaults shown in help, but actual defaults come from config)
 	flag.BoolVarP(&showVersion, "version", "v", false, "Show version")
 	flag.BoolVarP(&showHelp, "help", "h", false, "Show help")
-	flag.IntVarP(&previewHeight, "preview-height", "P", 40, "Preview window height/width percentage (1-100)")
-	flag.StringVar(&previewPosition, "preview-position", "bottom", "Preview position: bottom, top, left, right")
-	flag.BoolVarP(&noLineNumbers, "no-line-numbers", "n", false, "Disable line numbers")
-	flag.IntVarP(&lineNumWidth, "line-width", "w", 6, "Line number width")
-	flag.StringVarP(&prompt, "prompt", "p", "watchr> ", "Prompt string")
-	flag.StringVarP(&shell, "shell", "s", "sh", "Shell to use for executing commands")
-	flag.IntVarP(&refreshSeconds, "refresh", "r", 0, "Auto-refresh interval in seconds (0 = disabled)")
+	flag.BoolVarP(&showConfig, "show-config", "C", false, "Show loaded configuration and exit")
+	flag.StringVarP(&configFile, "config", "c", "", "Load config from specified path")
+	flag.StringP("preview-size", "P", "40%", "Preview size: number for lines/cols, or number% for percentage (e.g., 10 or 40%)")
+	flag.StringP("preview-position", "o", "bottom", "Preview position: bottom, top, left, right")
+	flag.BoolP("no-line-numbers", "n", false, "Disable line numbers")
+	flag.IntP("line-width", "w", 6, "Line number width")
+	flag.StringP("prompt", "p", "watchr> ", "Prompt string")
+	flag.StringP("shell", "s", "sh", "Shell to use for executing commands")
+	flag.StringP("refresh", "r", "0", "Auto-refresh interval (e.g., 1, 1.5, 500ms, 2s, 5m, 1h; default unit: seconds, 0 = disabled)")
+	flag.BoolP("interactive", "i", false, "Run shell in interactive mode (sources ~/.bashrc, ~/.zshrc, etc.)")

 	printUsage := func(w *os.File) {
-		fmt.Fprintf(w, "Usage: watchr [options] <command to run>\n\n")
-		fmt.Fprintf(w, "A terminal UI for running and watching command output.\n\n")
-		fmt.Fprintf(w, "Options:\n")
+		_, _ = fmt.Fprintf(w, "Usage: watchr [options] <command to run>\n\n")
+		_, _ = fmt.Fprintf(w, "A terminal UI for running and watching command output.\n\n")
+		_, _ = fmt.Fprintf(w, "Options:\n")
 		flag.CommandLine.SetOutput(w)
 		flag.PrintDefaults()
 		flag.CommandLine.SetOutput(os.Stderr)
-		fmt.Fprintf(w, "\nKeybindings:\n")
-		fmt.Fprintf(w, "  r, Ctrl-r      Reload (re-run command)\n")
-		fmt.Fprintf(w, "  q, Esc         Quit\n")
-		fmt.Fprintf(w, "  j, k           Move down/up\n")
-		fmt.Fprintf(w, "  g              Go to first line\n")
-		fmt.Fprintf(w, "  G              Go to last line\n")
-		fmt.Fprintf(w, "  Ctrl-d/u       Half page down/up\n")
-		fmt.Fprintf(w, "  PgDn/Up, ^f/b  Full page down/up\n")
-		fmt.Fprintf(w, "  p              Toggle preview\n")
-		fmt.Fprintf(w, "  /              Enter filter mode\n")
-		fmt.Fprintf(w, "  Esc            Exit filter mode / clear filter\n")
+		_, _ = fmt.Fprintf(w, "\nKeybindings:\n")
+		_, _ = fmt.Fprintf(w, "  r, Ctrl-r      Reload (re-run command)\n")
+		_, _ = fmt.Fprintf(w, "  q, Esc         Quit\n")
+		_, _ = fmt.Fprintf(w, "  j, k           Move down/up\n")
+		_, _ = fmt.Fprintf(w, "  g              Go to first line\n")
+		_, _ = fmt.Fprintf(w, "  G              Go to last line\n")
+		_, _ = fmt.Fprintf(w, "  Ctrl-d/u       Half page down/up\n")
+		_, _ = fmt.Fprintf(w, "  PgDn/Up, ^f/b  Full page down/up\n")
+		_, _ = fmt.Fprintf(w, "  p              Toggle preview\n")
+		_, _ = fmt.Fprintf(w, "  /              Enter filter mode\n")
+		_, _ = fmt.Fprintf(w, "  Esc            Exit filter mode / clear filter\n")
+		_, _ = fmt.Fprintf(w, "  y              Yank (copy) selected line\n")
+		_, _ = fmt.Fprintf(w, "  ?              Show help overlay\n")
 	}

 	flag.Usage = func() {
@@ -62,6 +65,19 @@ func main() {

 	flag.Parse()

+	// Initialize config (loads config files and sets defaults)
+	if configFile != "" {
+		if err := config.InitWithFile(configFile); err != nil {
+			fmt.Fprintf(os.Stderr, "Error loading config file: %v\n", err)
+			os.Exit(1)
+		}
+	} else {
+		config.Init()
+	}
+
+	// Bind flags to config (CLI flags override config file values)
+	config.BindFlags(flag.CommandLine)
+
 	if showHelp {
 		printUsage(os.Stdout)
 		os.Exit(0)
@@ -72,6 +88,11 @@ func main() {
 		os.Exit(0)
 	}

+	if showConfig {
+		config.PrintConfig()
+		os.Exit(0)
+	}
+
 	args := flag.Args()
 	if len(args) == 0 {
 		fmt.Fprintln(os.Stderr, "Error: No command provided")
@@ -81,18 +102,39 @@ func main() {

 	cmdStr := strings.Join(args, " ")

-	config := ui.Config{
-		Command:         cmdStr,
-		Shell:           shell,
-		PreviewHeight:   previewHeight,
-		PreviewPosition: ui.PreviewPosition(previewPosition),
-		ShowLineNums:    !noLineNumbers,
-		LineNumWidth:    lineNumWidth,
-		Prompt:          prompt,
-		RefreshSeconds:  refreshSeconds,
+	// Get config values (merged from: defaults < config file < CLI flags)
+	previewSize := config.GetString(config.KeyPreviewSize)
+	previewPosition := config.GetString(config.KeyPreviewPosition)
+	shell := config.GetString(config.KeyShell)
+	lineNumWidth := config.GetInt(config.KeyLineWidth)
+	prompt := config.GetString(config.KeyPrompt)
+	refreshInterval := config.GetDuration(config.KeyRefresh)
+	showLineNums := config.ShowLineNumbers()
+	interactive := config.GetBool(config.KeyInteractive)
+
+	// Parse preview size (e.g., "40" for lines/cols, "40%" for percentage)
+	previewSizeIsPercent := strings.HasSuffix(previewSize, "%")
+	previewSizeStr := strings.TrimSuffix(previewSize, "%")
+	previewSizeVal, err := strconv.Atoi(previewSizeStr)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Error: Invalid preview size: %s\n", previewSize)
+		os.Exit(1)
 	}

-	if err := ui.Run(config); err != nil {
+	uiConfig := ui.Config{
+		Command:              cmdStr,
+		Shell:                shell,
+		PreviewSize:          previewSizeVal,
+		PreviewSizeIsPercent: previewSizeIsPercent,
+		PreviewPosition:      ui.PreviewPosition(previewPosition),
+		ShowLineNums:         showLineNums,
+		LineNumWidth:         lineNumWidth,
+		Prompt:               prompt,
+		RefreshInterval:      refreshInterval,
+		Interactive:          interactive,
+	}
+
+	if err := ui.Run(uiConfig); err != nil {
 		fmt.Fprintf(os.Stderr, "Error: %v\n", err)
 		os.Exit(1)
 	}
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.0.1
+1.5.2
Author	SHA1	Message	Date
github-actions[bot]	67de2606cd	chore(master): release 1.5.2	2026-01-24 02:05:28 +02:00
Chen Asraf	c09d3e41dd	fix: tab characters breaking the layout	2026-01-24 02:03:50 +02:00
Chen Asraf	b8be28d92b	build: use reusable go-release workflow	2026-01-22 23:21:49 +02:00
Chen Asraf	69f8ed1ef0	build: add changelog to homebrew workflows	2026-01-22 21:26:42 +02:00
github-actions[bot]	d130becd99	chore(master): release 1.5.1	2026-01-07 22:57:55 +02:00
Chen Asraf	5703a61ddb	fix: esc button behavior	2025-12-31 11:28:08 +02:00
github-actions[bot]	ca06d0d7c1	chore(master): release 1.5.0	2025-12-14 18:06:39 +02:00
Chen Asraf	f15b9e2559	feat: add more refresh duration options & formats	2025-12-14 18:04:40 +02:00
Chen Asraf	7be6a03d6d	docs: update README.md	2025-12-10 15:43:06 +02:00
github-actions[bot]	574ef6abd3	chore(master): release 1.4.0	2025-12-09 01:26:08 +02:00
Chen Asraf	66c6599506	feat: properly support streaming commands	2025-12-09 01:24:21 +02:00
Chen Asraf	9ecf9f74b7	feat: add -i/--interactive mode	2025-12-09 00:48:01 +02:00
Chen Asraf	4340aa1cc0	refactor: fix lint warnings	2025-12-04 17:26:13 +02:00
Chen Asraf	d01944bfec	build: add lint configuration	2025-12-04 17:26:02 +02:00
Chen Asraf	9ac39a6472	build: add formatted files on commit	2025-12-04 17:10:26 +02:00
Chen Asraf	ed2f24c0e8	feat: add spinning loader animation	2025-12-04 17:08:38 +02:00
github-actions[bot]	a3c46bfa7c	chore(master): release 1.3.0	2025-12-04 13:45:48 +02:00
Chen Asraf	5e1b807105	fix: current line style	2025-12-04 13:22:50 +02:00
Chen Asraf	51b9e92ddd	feat: add exit status to command header	2025-12-04 13:05:26 +02:00
Chen Asraf	320874a61a	build: add lint makefile target	2025-12-04 13:05:14 +02:00
Chen Asraf	cdd895d19a	feat: help overlay window	2025-12-04 12:57:30 +02:00
github-actions[bot]	b76ae3bd7e	chore(master): release 1.2.0	2025-12-03 23:56:00 +02:00
Chen Asraf	2619708244	feat: yank line	2025-12-03 23:53:50 +02:00
Chen Asraf	2d76e43519	feat: update ui with panes & borders	2025-12-03 23:42:36 +02:00
Chen Asraf	ab94ceb228	feat: add --config/-c argument	2025-12-03 23:03:14 +02:00
Chen Asraf	6c677a0d29	build: update Makefile	2025-12-03 23:03:14 +02:00
Chen Asraf	c9affe8375	feat: add --show-config/-C argument	2025-12-03 23:03:14 +02:00
github-actions[bot]	5528f090d8	chore(master): release 1.1.0	2025-12-03 18:05:24 +02:00
Chen Asraf	0727defa98	chore: fix lint errors	2025-12-03 18:01:53 +02:00
Chen Asraf	9353705f52	feat: global/project-local config files	2025-12-03 17:59:02 +02:00
Chen Asraf	c2b0bc51d0	feat: support fixed/percent preview sizes	2025-12-03 17:34:47 +02:00
@@ -1 +1 @@
 .0.1
 .5.2