tg-checkout.sh

   1 #!/bin/sh
   2 # TopGit - A different patch queue manager
   3 # Copyright (C) 2013 Per Cederqvist <ceder@lysator.liu.se>
   4 # Copyright (C) 2015 Kyle J. McKay <mackyle@gmail.com>
   5 # All rights reserved.
   6 # GPLv2
   7
   8 ## Parse options
   9
  10 USAGE="Usage: ${tgname:-tg} [...] checkout [ [ push | pop ] [ -a ] | [goto] [--] <pattern> ]"
  11
  12 # Subcommands.
  13 push=
  14 pop=
  15 goto=
  16
  17 # Options of "push" and "pop".
  18 all=
  19
  20 # Arguments of "goto".
  21 pattern=
  22
  23 checkout() {
  24         _head="$(git rev-parse --revs-only --abbrev-ref=loose HEAD --)"
  25         ref_exists "refs/$topbases/$_head" && branch_annihilated "$_head" && _checkout_opts="-f"
  26         git checkout ${_checkout_opts} "$1"
  27 }
  28
  29 while [ $# -gt 0 ]; do
  30         arg="$1"
  31         shift
  32
  33         case "$arg" in
  34                 -h|--help)
  35                         printf '%s\n' "$USAGE"
  36                         exit 0;;
  37                 -a|--all)
  38                         all=1;;
  39                 child|next|push)
  40                         push=1;;
  41                 parent|prev|pop|..)
  42                         pop=1;;
  43                 goto|--)
  44                         goto=1
  45                         [ "$arg" = "--" -o "$1" != "--" ] || shift
  46                         if [ $# -gt 0 ]; then
  47                                 pattern="$1"
  48                                 shift
  49                         fi;;
  50                 *)
  51                         if [ -z "$all$push$pop$goto" -a -n "$arg" ]; then
  52                                 goto=1
  53                                 pattern="$arg"
  54                         else
  55                                 printf '%s\n' "$USAGE" >&2
  56                                 exit 1
  57                         fi;;
  58         esac
  59 done
  60
  61 if [ "$goto$all" = 11 ]; then
  62         die "goto -a does not make sense."
  63 fi
  64
  65 if [ -z "$push$pop$goto" ]; then
  66         # Default subcommand is "push".  This was the most reasonable
  67         # opposite of ".." that I could figure out.  "goto" would also
  68         # make sense as the default command, I suppose.
  69         push=1
  70 fi
  71
  72 [ "$push$pop$goto" = "1" ] || { err "incompatible options"; printf '%s\n' "$USAGE" >&2; exit 1; }
  73
  74 [ -n "$tg_tmp_dir" ] || die "tg-checkout must be run via '$tg checkout'"
  75 _depfile="$(mktemp "$tg_tmp_dir/tg-co-deps.XXXXXX")"
  76 _altfile="$(mktemp "$tg_tmp_dir/tg-co-alt.XXXXXX")"
  77
  78 if [ -n "$goto" ]; then
  79         $tg summary -t | grep -e "$pattern" >"$_altfile" || :
  80         no_branch_found="No topic branch matches grep pattern '$pattern'"
  81 else
  82         branch="$(git symbolic-ref -q HEAD)" || die "Working on a detached head"
  83         branch="$(git rev-parse --revs-only --abbrev-ref "$branch" --)"
  84
  85         if [ -n "$pop" ]; then
  86                 no_branch_found="$branch does not depend on any topic"
  87         else
  88                 no_branch_found="No topic depends on $branch"
  89         fi
  90
  91         if [ -z "$all" ]; then
  92                 if [ -n "$pop" ]; then
  93                         $tg prev -w >"$_altfile"
  94                 else
  95                         $tg next >"$_altfile"
  96                 fi
  97         else
  98                 $tg summary --deps >$_depfile || die "${tgname:-tg} summary failed"
  99
 100                 if [ -n "$pop" ]; then
 101                         dir=pop
 102                 else
 103                         dir=push
 104                 fi
 105                 script=@sharedir@/leaves.awk
 106                 awk -f @sharedir@/leaves.awk dir=$dir start=$branch <$_depfile | sort >"$_altfile"
 107         fi
 108 fi
 109
 110 _alts=$(( $(wc -l <"$_altfile") ))
 111 if [ $_alts = 0 ]; then
 112         die "$no_branch_found"
 113 elif [ $_alts = 1 ]; then
 114         checkout "$(cat "$_altfile")"
 115         exit $?
 116 fi
 117
 118 catn() {
 119         sed = | paste -d ":" - - | sed 's/^/     /;s/^ *\(......\):/\1  /'
 120 }
 121
 122 echo Please select one of the following topic branches:
 123 catn <"$_altfile"
 124 printf '%s' "Input the number: "
 125 read -r n
 126
 127 # Check the input
 128 sane="$(sed 's/[^0-9]//g' <<-EOT
 129         $n
 130         EOT
 131 )"
 132 if [ -z "$n" ] || [ "$sane" != "$n" ]; then
 133         die "Bad input"
 134 fi
 135 if [ $n -lt 1 ] || [ $n -gt $_alts ]; then
 136         die "Input out of range"
 137 fi
 138
 139 new_branch="$(sed -n ${n}p "$_altfile")"
 140 [ -n "$new_branch" ] || die "Bad input"
 141
 142 checkout "$new_branch"