~/bin/swgit to switch .git folders in your current folder

swgit

#!/bin/bash

main() {
  local switch_to=$1
  local what_repo=$(basename "$(pwd)")
  local topd=$(pwd)
  local top=true
  [[ -d .git ]] || top=false
  while [[ $top == false ]] ; do
    cd .. || die "ERROR: Failed to find a top git repo root (a parent folder with a .git subfolder, stopped at $tmp)."
    local tmp=$(pwd)
    [[ $tmp != $topd ]] || die "ERROR: Failed to find a top git repo root (a parent folder with a .git subfolder, stopped at $tmp)."
    topd=$tmp
    [[ -d .git ]] || top=false
  done ;
  local current=$(cat ../.swgit-current-$what_repo 2>/dev/null || true)
  if [[ -z $current ]] ; then
    if [[ $switch_to ]] ; then
      if [[ $switch_to -gt 1 ]] ; then
        current=$(($switch_to - 1))
      else
        current=$(($switch_to + 1))
      fi ;
    else
      current=1
      switch_to=2
    fi ;
  fi ;
  if [[ -z $switch_to ]] ; then
    if [[ $current -gt 1 ]] ; then
      switch_to=$(($current - 1))
    else
      switch_to=$(($current + 1))
    fi ;
  fi ;
  echo "$0: Switching $topd from $current to $switch_to."
  if confirm ; then
    switch_dot_git "$current" "$switch_to" || die "ERROR: Failed to switch $topd from $current to $switch_to: $?."
    echo "$switch_to" > ../.swgit-current-$what_repo || die "ERROR: Failed to record current git number ($switch_to): $?."
  fi ;
}
confirm() {
  local result=1 # default = no
  local answer
  local sets=$-
  set +ex
  local keep_prompting=true
  echo -n "Confirm [Y/n]: " ;
  while [[ $keep_prompting == true ]] ; do
    keep_prompting=false
    stty -echo
    read answer
    stty echo
    echo
    if [[ $answer == Y ]] ; then
      result=0
    else
      if echo "$answer" | egrep -i '^(go|ok|sure|true|y|yeppers|yes)$' >/dev/null ; then
        echo -n "You answered '$answer' but I only accept 'Y'. Did you mean 'Y' [Y/n]: "
        keep_prompting=true
      fi ;
    fi ;
  done ;
  set $sets
  return $result
}
die() {
  echo "$1"
  exit 1
}
switch_dot_git() {
  local current=$1
  local switch_to=$2
  local cur_d="../.swgit$current-$what_repo"
  local swto_d="../.swgit$switch_to-$what_repo"
  [[ -d $cur_d ]] || mkdir $cur_d || return 1
  [[ -d $swto_d ]] || mkdir $swto_d || return 1
  [[ -e .git ]] || git init || return 1
  mv .git $cur_d/ || return 1
  [[ -e $swto_d/.git ]] && mv $swto_d/.git ./ || git init || return 1

  [[ ! -e $swto_d/.gitignore ]] || {
    [[ ! -e .gitignore ]] || mv -f .gitignore $cur_d/ || return 1
    mv $swto_d/.gitignore ./ || return 1
  }
  return 0
}

main "$@"

#