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lib/git.ex
defmodule Git do
@moduledoc """
Module for interacting with git.
"""
@common_args [
stderr_to_stdout: true,
parallelism: true,
env: [
{"GIT_TRACE", "0"},
{"GIT_CURL_VERBOSE", "0"},
{"GIT_DEBUG", "0"}
]
]
def is_available? do
case System.find_executable("git") do
nil -> false
_ -> true
end
end
def git_root() do
Settings.new()
|> Settings.get_root()
|> case do
{:ok, root} ->
case git_cmd(["-C", root, "rev-parse", "--show-toplevel"]) do
{:ok, root} -> {:ok, root}
_ -> {:error, :not_a_git_repo}
end
{:error, :not_found} ->
{:error, :not_a_git_repo}
end
end
def is_git_repo?() do
case git_root() do
{:ok, _} -> true
_ -> false
end
end
def is_git_repo?(path) do
case git_cmd(["-C", path, "rev-parse", "--is-inside-work-tree"]) do
{:ok, _} -> true
_ -> false
end
end
def current_branch() do
git(["rev-parse", "--abbrev-ref", "HEAD"])
|> case do
{:ok, branch} -> {:ok, branch}
_ -> {:error, :not_a_git_repo}
end
end
def grep(regex, ignore_case?) do
if ignore_case? do
["grep", "-m", "1", "-i", regex]
else
["grep", "-m", "1", "-e", regex]
end
|> git()
end
def pickaxe_regex(regex) do
git(["log", "-G", regex])
end
def show(sha) do
git(["show", sha])
end
def show(sha, file) do
with {:ok, root} <- git_root() do
# Make file relative to git root
file = Path.relative_to(file, root)
git(root, ["show", "#{sha}:#{file}"])
end
end
def git_log(args) do
git(["log"] ++ args)
end
def git_diff(args) do
git(["diff"] ++ args)
end
def base_commit(topic, main) do
git(["merge-base", main, topic])
end
def diff_branch(topic, main) do
topic =
if String.starts_with?(topic, "origin/") do
topic
else
"origin/#{topic}"
end
main =
if String.starts_with?(main, "origin/") do
main
else
"origin/#{main}"
end
with {:ok, base} <- base_commit(topic, main),
{:ok, commits} <- git_log(["--no-merges", "#{base}..#{topic}"]),
{:ok, changes} <- git_diff(["#{base}..#{topic}"]) do
{:ok, {commits, changes}}
end
end
def list_branches() do
git(["branch", "-a", "-r", "--list"])
end
def is_ignored?(file) do
case git(["check-ignore", file]) do
{:ok, _} -> true
_ -> false
end
end
def is_ignored?(file, git_root) do
case git(git_root, ["check-ignore", file]) do
{:ok, _} -> true
_ -> false
end
end
def ignored_files() do
with {:ok, root} <- git_root() do
ignored_files(root)
end
end
def ignored_files(root) do
git(["ls-files", "--others", "--ignored", "--exclude-standard"])
|> case do
{:ok, out} ->
{:ok,
out
|> String.split("\n", trim: true)
|> Enum.map(&Path.absname(&1, root))
|> MapSet.new()}
{:error, error_output} ->
{:error, String.trim_trailing(error_output)}
end
end
def ignored_dirs() do
with {:ok, root} <- git_root() do
ignored_dirs(root)
end
end
def ignored_dirs(root) do
git(["ls-files", "--others", "--ignored", "--exclude-standard", "--directory"])
|> case do
{:ok, out} ->
{:ok,
out
|> String.split("\n", trim: true)
|> Enum.map(&Path.expand(&1, root))
|> MapSet.new()}
{:error, error_output} ->
{:error, String.trim_trailing(error_output)}
end
end
# -----------------------------------------------------------------------------
# Private functions
# -----------------------------------------------------------------------------
defp git(root, args) do
git(["-C", root] ++ args)
end
defp git(args) do
args
|> git_args()
|> git_cmd()
end
defp git_args(args) do
if "-C" in args do
args
else
with {:ok, root} <- git_root() do
["-C", root] ++ args
else
_ -> args
end
end
end
defp git_cmd(args) do
case System.cmd("git", args, @common_args) do
{output, 0} -> {:ok, String.trim_trailing(output)}
{output, _} -> {:error, String.trim_trailing(output)}
end
end
end