dotfiles/bin/linux/git-top

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#!/usr/bin/env bash
#
# --------------------------------------------------------
# Usage
# --------------------------------------------------------
#
# git top [branch-name]
#
# --------------------------------------------------------
# Summary
# --------------------------------------------------------
#
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# Performs a pull from origin onto the default branch before rebasing the
# current branch on to the default branch.
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#
# Author: Tony Grosinger
#
# --------------------------------------------------------
# Installation
# --------------------------------------------------------
#
# Place the following in your .bashrc then place this file on your path.
#
# _git_top() {
# if [[ "${COMP_LINE}" =~ ^git\ top.*$ ]]; then
# __gitcomp_nl "$(__git_heads)"
# else
# __git_main
# fi
# }
#
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# Ensure the following is in your .gitconfig alias section:
#
# default-branch = "!git symbolic-ref refs/remotes/origin/HEAD | cut -f4 -d/"
#
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VERSION="v0.0.2"
GREEN="\e[32m"
BLUE="\e[34m"
RED="\e[91m"
CLEAR="\e[0m"
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DEFAULT_BRANCH=$(git default-branch)
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version() {
echo "git top ${VERSION}"
echo ""
}
usage() {
echo "usage: git top [branch-name]"
echo ""
echo "If branch name is omitted, current branch will be updated"
}
print_cmd() {
echo -e "${GREEN}>> ${CLEAR}${@}"
}
print_status() {
echo -e "${BLUE}${@}${CLEAR}"
}
print_fatal() {
echo -e >&2 "${RED}Fatal: ${CLEAR}${@}"
}
exec_cmd() {
print_cmd ${1}
${1}
}
require_git_repo() {
git rev-parse --is-inside-work-tree > /dev/null 2>&1
if [ $? != 0 ]; then
print_fatal "Not a git repository"
exit 1
fi
}
require_clean_work_tree() {
# Outputs an error to stderr if working tree is not clean, then exits
# Function retrieved from http://www.spinics.net/lists/git/msg142043.html
# http://stackoverflow.com/questions/3878624/how-do-i-programmatically-determine-if-there-are-uncommited-changes
# Update the index
git update-index -q --ignore-submodules --refresh
err=0
# Disallow unstaged changes in the working tree
if ! git diff-files --quiet --ignore-submodules --
then
echo >&2 "cannot $1: you have unstaged changes."
git diff-files --name-status -r --ignore-submodules -- >&2
err=1
fi
# Disallow uncommitted changes in the index
if ! git diff-index --cached --quiet HEAD --ignore-submodules --
then
echo >&2 "cannot $1: your index contains uncommitted changes."
git diff-index --cached --name-status -r --ignore-submodules HEAD -- >&2
err=1
fi
if [ $err = 1 ]
then
echo >&2 "Please commit or stash them."
exit 1
fi
}
checkout() {
exec_cmd "git checkout -q ${1}"
}
pull_remote() {
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checkout "${DEFAULT_BRANCH}"
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exec_cmd "git pull -r -q"
if [ $? != 0 ]; then
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echo >&2 "Could not pull on ${DEFAULT_BRANCH}, please check that upstream is set and try again."
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exit 1
fi
}
rebase() {
local startbranch=${1}
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exec_cmd "git rebase -q ${DEFAULT_BRANCH} ${startbranch}"
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if [ $? != 0 ]; then
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echo >&2 "Could not rebase ${startbranch} on ${DEFAULT_BRANCH}, rolling back changes."
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echo >&2 "Please manually resolve conflicts."
git rebase --abort
exit 1
fi
}
main() {
require_git_repo
local startbranch=`git rev-parse --abbrev-ref HEAD`
if [ $# = 1 ]; then
case "$1" in
"-h"|"--help")
usage
exit 0
;;
"-v"|"--version")
version
exit 0
;;
*)
startbranch=$1
;;
esac
elif [ $# != 0 ]; then
print_fatal "Invalid number of arguments provided"
echo ""
usage
exit 1
fi
git show-ref --verify -q refs/heads/${startbranch}
if [ $? != 0 ]; then
print_fatal "Branch \"${startbranch}\" does not exist"
exit 1
fi
require_clean_work_tree
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git fetch -p
if [ ${startbranch} = "${DEFAULT_BRANCH}" ]; then
print_status "Already on ${DEFAULT_BRANCH}, only performing git pull"
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pull_remote
else
pull_remote
rebase $startbranch
fi
checkout $startbranch
print_status "Branch update complete."
}
main "$@"