_shared_git

#!/usr/bin/env sh

# SPDX-FileCopyrightText: 2021 Robin Vobruba <hoijui.quaero@gmail.com>
#
# SPDX-License-Identifier: GPL-3.0-or-later

# A kind of mini library of useful, git related BASH code.
# It can be included in scripts like this:
#
## sh
#script_dir=`dirname "${0}"`
#. "$script_dir/_shared_git"
#
## bash
#script_dir=$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")
#source "$script_dir/_shared_git"

# Tries to fetch a git-portal access-token from the local config files.
# @param portal  name of the portal to fetch the access token of
#                ("github"|"gitlab", default: "github")
# Examples:
#	$ _git_get_access_token
#	1234567890abcdef1234567890abcdef
#	$ _git_get_access_token "github"
#	1234567890abcdef1234567890abcdef
#	$ _git_get_access_token "gitlab"
#	abd-456-34Hr65
_git_get_access_token() {

	portal="${1:-github}"
	access_token_file=~/.config/${portal}-access-token.txt
	if [ -e "$access_token_file" ]
	then
		access_token=$(cat "$access_token_file")
	else
		access_token="<ACCESS_TOKEN_NOT_FOUND>"
		>&2 echo "Access-token file does not exist: '$access_token_file'"
	fi
	echo -n "$access_token"
}

# Given a (GitHub like) git repo URL, returns the owner of the repo/project.
_git_url_extract_owner() {

	repo_url="$1"
	repo_owner=$(echo "$repo_url" | sed -e 's|\.git$||' -e 's|/$||' -e 's|/[^/]*$||' -e 's|.*[:/]||')
	echo "${repo_owner}"
}

# Given a (GitHub like) git repo URL, returns the name of the repo/project.
_git_url_extract_name() {

	repo_url="$1"
	repo_name=$(echo "$repo_url" | sed -e 's|\.git$||' -e 's|/$||' -e 's|.*[:/]||')
	echo "${repo_name}"
}

# Returns the name of the currently checked out branch in the git repo at $(pwd).
_git_get_current_branch() {

	#git name-rev HEAD 2> /dev/null | sed 's#HEAD\ \(.*\)#\1#'
	_branch="$(git branch | grep "[*]" | cut -d ' ' -f2)"
	if [ "$_branch" = "(HEAD" ]
	then
		_branch="NONE"
	fi
	echo "$_branch"
}

_git_local_branch() {

	repo_path="${1:-.}"
	git -C "$repo_path" rev-parse --abbrev-ref HEAD
}

# Returns the remote- and branch-name of the remote tracking branch.
# Example:
# $ _git_remote_tracking_branch . master
# origin/master
_git_remote_tracking_branch() {

	repo_path="${1:-.}"
	local_branch="${2:-"$(_git_local_branch "$repo_path")"}"
	git -C "$repo_path" branch -vv \
		| sed -e 's/^..//' \
		| grep -E "^${local_branch} " \
		| sed -e 's/^[^ ]\+ \+[^ ]\+ \+\[//' -e 's/. .*//'
}