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lib/git_cli.ex
# lib/git_cli.ex
defmodule GitCli do
@moduledoc """
Wrapper for direct git CLI calls. Provides helper functions for repo checks,
formatted info messages, and listing ignored files in a given root.
"""
@spec is_git_repo?() :: boolean()
def is_git_repo? do
System.find_executable("git") != nil and File.dir?(".git")
end
def repo_root() do
git = System.find_executable("git")
if git do
cwd = File.cwd!()
case System.cmd(git, ["rev-parse", "--git-common-dir"], cd: cwd, stderr_to_stdout: true) do
{out, 0} ->
out
|> String.trim()
|> Path.dirname()
_ ->
nil
end
else
nil
end
end
def is_worktree? do
case System.cmd("git", ["rev-parse", "--is-inside-work-tree"],
cd: File.cwd!(),
stderr_to_stdout: true
) do
{"true\n", 0} -> true
_ -> false
end
end
def worktree_root() do
if is_worktree?() do
case System.cmd("git", ["rev-parse", "--show-toplevel"],
cd: File.cwd!(),
stderr_to_stdout: true
) do
{result, 0} -> String.trim(result)
_ -> nil
end
else
nil
end
end
@spec current_branch() :: String.t() | nil
def current_branch() do
case System.cmd("git", ["rev-parse", "--abbrev-ref", "HEAD"],
cd: File.cwd!(),
stderr_to_stdout: true
) do
{out, 0} ->
case String.trim(out) do
"HEAD" ->
case System.cmd("git", ["rev-parse", "--short", "HEAD"],
cd: File.cwd!(),
stderr_to_stdout: true
) do
{sha, 0} -> "@" <> String.trim(sha)
_ -> nil
end
branch ->
branch
end
_ ->
nil
end
end
@spec git_info() :: String.t()
def git_info() do
git = System.find_executable("git")
if git do
cwd = File.cwd!()
root =
case System.cmd(git, ["rev-parse", "--show-toplevel"], cd: cwd, stderr_to_stdout: true) do
{out, 0} -> String.trim(out)
_ -> nil
end
branch =
if root do
case System.cmd(git, ["rev-parse", "--abbrev-ref", "HEAD"],
cd: root,
stderr_to_stdout: true
) do
{out, 0} -> String.trim(out)
_ -> nil
end
end
if root && branch do
"""
You are working in a git repository.
The current branch is `#{branch}`.
The git root is `#{root}`.
"""
else
"Note: this project is not under git version control."
end
else
"Note: git executable not found on PATH."
end
end
@spec ignored_files(String.t() | nil) :: map()
@doc """
Returns an empty map if root is nil, otherwise behaves as before.
"""
def ignored_files(nil), do: %{}
def ignored_files(root) when is_binary(root) do
case System.cmd("git", ["ls-files", "--others", "--ignored", "--exclude-standard"],
cd: root,
stderr_to_stdout: true
) do
{out, 0} ->
out
|> String.split("\n", trim: true)
|> Enum.map(&Path.absname(&1, root))
|> Map.new(&{&1, true})
_ ->
%{}
end
end
end