tg-checkout.sh

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