feat(nvim): add md_anchor

.config/nvim/lua/casraf/lib/md_anchor.lua

@@ -0,0 +1,80 @@
+local M = {}
+
+local function default_gx()
+  local cfile = vim.fn.expand("<cfile>")
+  if cfile and cfile ~= "" then
+    vim.ui.open(cfile)
+  end
+end
+
+local function header_to_anchor(text)
+  text = text:lower()
+  text = text:gsub("`([^`]*)`", "%1")
+  text = text:gsub("[^%w%s%-]", "")
+  text = text:gsub("%s+", "-")
+  return text
+end
+
+local function get_link_target()
+  local line = vim.api.nvim_get_current_line()
+  local col = vim.api.nvim_win_get_cursor(0)[2] + 1
+
+  local search_start = 1
+  while true do
+    local close_bracket = line:find("%]%(", search_start)
+    if not close_bracket then break end
+
+    local paren_start = close_bracket + 2
+    local paren_end = line:find("%)", paren_start)
+    if not paren_end then break end
+
+    if col >= paren_start and col <= paren_end then
+      return line:sub(paren_start, paren_end - 1)
+    end
+
+    search_start = paren_end + 1
+  end
+
+  return nil
+end
+
+local function jump_to_anchor(anchor)
+  local lines = vim.api.nvim_buf_get_lines(0, 0, -1, false)
+  for i, line_text in ipairs(lines) do
+    local header = line_text:match("^#+%s+(.*)")
+    if header and header_to_anchor(header) == anchor then
+      vim.api.nvim_win_set_cursor(0, { i, 0 })
+      return true
+    end
+  end
+  return false
+end
+
+function M.gx()
+  if vim.bo.filetype ~= "markdown" then
+    default_gx()
+    return
+  end
+
+  local target = get_link_target()
+  if not target then
+    default_gx()
+    return
+  end
+
+  local anchor = target:match("^#(.+)")
+  if not anchor then
+    default_gx()
+    return
+  end
+
+  if not jump_to_anchor(anchor) then
+    vim.notify("Anchor not found: #" .. anchor, vim.log.levels.WARN)
+  end
+end
+
+function M.setup()
+  vim.keymap.set("n", "gx", M.gx, { desc = "Smart gx: markdown anchors or default" })
+end
+
+return M

.config/nvim/lua/casraf/plugins/md_anchor.lua

@@ -0,0 +1,3 @@
+require("casraf.lib.md_anchor").setup()
+
+return {}