#!/bin/bash

set -euo pipefail

:

: switch.sh \<branch\> # Wrap git switch in named stash push/pop.

:

: Check can switch

:

target_branch="${1:?Syntax is ./switch.sh <branch_name>}"

if ! git show-ref --verify --quiet "refs/heads/$target_branch"; then

echo "Branch $target_branch does not exist"

exit 1

fi

if [ "$target_branch" = "$(git rev-parse --abbrev-ref HEAD)" ]; then

echo "Already on $target_branch"

exit 2

fi

:

: Push branch specific stash if anything stashable

:

target_branch="${1:?Syntax is ./switch.sh <branch_name>}"

branch_name_1="$(git rev-parse --abbrev-ref HEAD)"

stash_1="switch_sh_$branch_name_1"

if ! git diff --quiet --exit-code || ! git diff --cached --quiet --exit-code; then

git stash push -m "$stash_1" || { echo "Stash failed"; return 1; }

fi

:

: Switch if possible

:

if ! git switch "$target_branch"; then

echo "Switch failed"

# Dont exit

fi

:

: Pop branch specific stash if present.

: This effectively reverts the initial push in case switch failed.

:

branch_name_2="$(git rev-parse --abbrev-ref HEAD)"

stash_2="switch_sh_$branch_name_2"

stash_ref="$(git stash list | awk -F: -v pat="$stash_2" '$0 ~ pat {print $1; exit}')"

if [ "$stash_ref" ]; then

# Note --index option to pop staged changes as well

# git incomprehensibly doesnt pop staged changes nor even provide a way to set it as the default

# except manually per user in ~/.gitconfig or per clone in .git/config

git stash pop --index "$stash_ref"

fi

:

: Exit