Initial Commit - Add nvim config

Signed-off-by: Daniel Henry <iamdanhenry@gmail.com>

.config/nvim/lua/c/utils.lua

@@ -0,0 +1,87 @@
+-- lua/c/utils.lua
+local M = {}
+
+-- Find the project root (same markers clangd likes)
+local function project_root(buf)
+  return vim.fs.root(buf or 0, { "compile_commands.json", ".git", "Makefile", "makefile" })
+end
+
+local function relpath(abs, root)
+  if not abs or not root then return nil end
+  if abs:sub(1, #root) ~= root then return nil end
+  local r = abs:sub(#root + 1)
+  if r:sub(1, 1) == "/" then r = r:sub(2) end
+  return r
+end
+
+local function dirpart(p) return p:match("^(.*)/") end
+
+-- Build the alternate path (header <-> source), preserving nested subdirs
+local function alternate_rel(rel)
+  local first = rel:match("^([^/]+)/")
+  local ext   = rel:match("%.([^.]+)$") or ""
+  local rest  = rel:gsub("^" .. (first or "") .. "/", "")
+
+  if first == "include" and ext == "h" then
+    return "src/" .. rest:gsub("%.h$", ".c")
+  elseif first == "src" and ext == "c" then
+    return "include/" .. rest:gsub("%.c$", ".h")
+  end
+
+  -- Fallbacks if file isn’t directly under include/ or src/
+  if ext == "h" then
+    return ("src/" .. rel):gsub("^src/include/", "src/"):gsub("%.h$", ".c")
+  elseif ext == "c" then
+    return ("include/" .. rel):gsub("^include/src/", "include/"):gsub("%.c$", ".h")
+  end
+
+  return nil
+end
+
+function M.toggle_header_source()
+  local buf  = 0
+  local abs  = vim.api.nvim_buf_get_name(buf)
+  if abs == "" then
+    vim.notify("No file name (unsaved buffer).", vim.log.levels.WARN)
+    return
+  end
+
+  local root = project_root(buf)
+  if not root then
+    vim.notify("Couldn’t locate project root (no .git/Makefile/compile_commands.json).", vim.log.levels.WARN)
+    return
+  end
+
+  local rel = relpath(abs, root)
+  if not rel then
+    vim.notify("File not under project root: " .. abs, vim.log.levels.WARN)
+    return
+  end
+
+  local alt_rel = alternate_rel(rel)
+  if not alt_rel then
+    vim.notify("Not a .c/.h under include/ or src/: " .. rel, vim.log.levels.WARN)
+    return
+  end
+
+  local alt_abs = root .. "/" .. alt_rel
+  if vim.loop.fs_stat(alt_abs) then
+    vim.cmd.edit(vim.fn.fnameescape(alt_abs))
+    return
+  end
+
+  -- Prompt to create
+  local choice = vim.fn.confirm(("Create %s?\n\n%s"):format(alt_rel, alt_abs), "&Yes\n&No", 2)
+  if choice ~= 1 then return end
+
+  -- Ensure dirs exist, then open the new file (unsaved until you write)
+  local dir = dirpart(alt_abs)
+  if dir and not vim.loop.fs_stat(dir) then
+    vim.fn.mkdir(dir, "p")
+  end
+  vim.cmd.edit(vim.fn.fnameescape(alt_abs))
+  -- Optional: write an empty file immediately. Comment out if you prefer unsaved buffer.
+  -- vim.cmd.write()
+end
+
+return M