refactor(neovim): improve git-config.lua with helper functions and new feature

- Extract git_cmd and git_cmd_list for reusable git command execution
- Add yank helper for consistent clipboard copying with notifications
- Enhance get_git_info to include abs_path and file_dir
- Add get_blame_info to retrieve detailed blame information with file hash
- Implement copy_commit_url for copying direct commit URLs
- Convert keymaps to use function references

New: <Leader>gC copies GitHub commit URL with file hash fragment

modules/home/programs/terminal/nvim/config/lua/git-config.lua

@@ -18,50 +18,107 @@ require("gitsigns").setup({
 })
 
 
+local function git_cmd(dir, cmd)
+	return vim.fn.system("git -C " .. vim.fn.escape(dir, " ") .. " " .. cmd)
+end
+
+local function git_cmd_list(dir, cmd)
+	return vim.fn.systemlist("git -C " .. vim.fn.escape(dir, " ") .. " " .. cmd)
+end
+
+local function yank(message)
+	vim.fn.setreg("+", message)
+	vim.notify("Copied:\n\t" .. message, vim.log.levels.INFO)
+end
+
 local function get_git_info()
 	local abs_path = vim.fn.expand("%:p")
-	local git_root = vim.fn.systemlist(
-		"git -C " .. vim.fn.escape(vim.fn.fnamemodify(abs_path, ":h"), " ") .. " rev-parse --show-toplevel"
-	)[1]
+	local file_dir = vim.fn.fnamemodify(abs_path, ":h")
+	local git_root = git_cmd_list(file_dir, "rev-parse --show-toplevel")[1]
 
 	if vim.v.shell_error ~= 0 then
+		vim.notify("Failed to get git info", vim.log.levels.ERROR)
 		return
 	end
 
-	local git_repo = vim.fn.system("git remote get-url origin"):match("([^/:]+/[^/.]+)%.?[^/]*$"):gsub("\n", "")
-	local git_branch = vim.fn.system("git rev-parse --abbrev-ref HEAD"):gsub("\n", "")
+	local git_repo = git_cmd(file_dir, "remote get-url origin"):match("([^/:]+/[^/.]+)%.?[^/]*$"):gsub("\n", "")
+	local git_branch = git_cmd(file_dir, "rev-parse --abbrev-ref HEAD"):gsub("\n", "")
 
 	return {
+		abs_path = abs_path,
+		file_dir = file_dir,
 		file = vim.fn.fnamemodify(abs_path, ":s?" .. git_root .. "/??"),
 		branch = git_branch,
 		repo = git_repo,
 	}
 end
 
-local function copy_git_link()
-	local git_info = get_git_info()
-	if git_info == nil then
-		vim.notify("Failed to get git info", vim.log.levels.ERROR)
+local function get_blame_info(file_dir, abs_path, line_num)
+	local blame_output = git_cmd_list(
+		file_dir,
+		"blame -L " .. line_num .. "," .. line_num .. " --porcelain " .. vim.fn.escape(abs_path, " ")
+	)
+
+	if vim.v.shell_error ~= 0 then
+		vim.notify("Failed to get git blame", vim.log.levels.ERROR)
 		return
 	end
 
+	local commit_hash = blame_output[1]:match("^(%S+)")
+	local original_line = blame_output[1]:match("^%S+ (%d+)")
+	local commit_file = nil
+
+	for _, line in ipairs(blame_output) do
+		local f = line:match("^filename (.+)$")
+		if f then
+			commit_file = f
+			break
+		end
+	end
+
+	if not commit_hash or not commit_file then
+		vim.notify("Failed to extract commit info", vim.log.levels.ERROR)
+		return
+	end
+
+	return {
+		hash = commit_hash,
+		line = tonumber(original_line),
+		file = commit_file,
+		file_hash = vim.fn.system("echo -n " .. vim.fn.shellescape(commit_file) .. " | sha256sum | cut -d' ' -f1"):gsub("\n",
+			""),
+	}
+end
+
+local function copy_git_link()
+	local git_info = get_git_info()
+	if not git_info then return end
+
 	local start_line = vim.fn.line("v")
 	local end_line = vim.fn.line(".")
 
-	local message = string.format(
+	yank(string.format(
 		"https://github.com/%s/blob/%s/%s#L%d-L%d",
-		git_info.repo,
-		git_info.branch,
-		git_info.file,
-		start_line,
-		end_line
-	)
-	vim.fn.setreg("+", message)
-	vim.notify("Copied:\n\t" .. message, vim.log.levels.INFO)
+		git_info.repo, git_info.branch, git_info.file, start_line, end_line
+	))
 end
 
--- Create KeyMaps
-vim.keymap.set("v", "<Leader>gy", function() copy_git_link() end, { desc = "Copy GitHub Link" })
+local function copy_commit_url()
+	local git_info = get_git_info()
+	if not git_info then return end
+
+	local blame = get_blame_info(git_info.file_dir, git_info.abs_path, vim.fn.line("."))
+	if not blame then return end
+
+	yank(string.format(
+		"https://github.com/%s/commit/%s#diff-%sR%d",
+		git_info.repo, blame.hash, blame.file_hash, blame.line
+	))
+end
+
+-- Keymaps
+vim.keymap.set("v", "<Leader>gy", copy_git_link, { desc = "Copy GitHub Link" })
+vim.keymap.set("n", "<Leader>gC", copy_commit_url, { desc = "Copy Commit URL" })
 vim.keymap.set('n', '<leader>go', '<cmd>DiffviewOpen<CR>', { desc = "Open Diff - Current" })
 vim.keymap.set('n', '<leader>gO', '<cmd>DiffviewOpen origin/main...HEAD<CR>', { desc = "Open Diff - Main" })
 vim.keymap.set('n', '<leader>gh', '<cmd>DiffviewFileHistory<CR>', { desc = "Diff History" })