tg-prev.sh

   1 #!/bin/sh
   2 # TopGit - A different patch queue manager
   3 # Copyright (C) 2008 Petr Baudis <pasky@suse.cz>
   4 # Copyright (C) 2009 Bert Wesarg <Bert.Wesarg@googlemail.com>
   5 # Copyright (C) 2017 Kyle J. McKay <mackyle@gmail.com>
   6 # All rights reserved
   7 # License GPLv2
   8
   9 USAGE="\
  10 Usage: ${tgname:-tg} [...] prev [-v] [-i | -w] [-a | -n <steps>] [<name>]"
  11
  12 usage()
  13 {
  14         [ -z "$2" ] || printf '%s\n' "$2" >&2
  15         if [ "${1:-0}" != 0 ]; then
  16                 printf '%s\n' "$USAGE" >&2
  17         else
  18                 printf '%s\n' "$USAGE"
  19         fi
  20         exit ${1:-0}
  21 }
  22
  23 script='
  24 NF == 1 { print }
  25 NF > 1 {
  26         names = ""
  27         for (i = 2; i <= NF; ++i) names = names ", " $i
  28         print $1 " [" substr(names, 3) "]"
  29 }'
  30
  31 # Parse options
  32
  33 all=
  34 steps=
  35 head_from=
  36 verbose=
  37 aremutex="are mutually exclusive"
  38
  39 docount()
  40 {
  41         case "$2" in
  42                 [1-9]*)
  43                         [ "$2" = "${2%%[!0-9]*}" ] ||
  44                         usage 1 "invalid $1 step count"
  45                         steps=$(( 0 + $2 ))
  46                         [ "$steps" != "0" ] ||
  47                         usage 1 "invalid $1 step count (0 not allowed)"
  48                         ;;
  49                 "")
  50                         usage 1 "invalid $1 step count (may not be empty string)"
  51                         ;;
  52                 *)
  53                         usage 1 "invalid $1 step count (must be positive number)"
  54                         ;;
  55         esac
  56 }
  57
  58 while [ $# -gt 0 ]; do case "$1" in
  59         -h|--help)
  60                 usage
  61                 ;;
  62         -v|--verbose)
  63                 verbose=1
  64                 ;;
  65         -i|-w)
  66                 [ -z "$head_from" ] || usage 1 "-i and -w $aremutex"
  67                 head_from="$1"
  68                 ;;
  69         -a|--all)
  70                 [ -z "$steps" ] || usage 1 "-a and -n $aremutex"
  71                 all=1
  72                 ;;
  73         --count=*)
  74                 [ -z "$all" ] || usage 1 "--count= and -a $aremutex"
  75                 docount "--count=" "${1#--count=}"
  76                 ;;
  77         --count|-n)
  78                 [ -z "$all" ] || usage 1 "$1 and -a $aremutex"
  79                 [ $# -ge 2 ] || usage 1 "$1 requires an argument"
  80                 docount "$1" "$2"
  81                 shift
  82                 ;;
  83         -?*)
  84                 usage 1 "Unknown option: $1"
  85                 ;;
  86         *)
  87                 break
  88                 ;;
  89 esac; shift; done
  90 [ $# -ne 0 ] || set -- "HEAD"
  91 [ $# -eq 1 ] || usage 1 "at most one branch name argument is allowed"
  92 v_verify_topgit_branch name "$1"
  93 [ -z "$all" ] || steps="-1"
  94 [ -n "$steps" ] || steps="1"
  95
  96 tdopt=
  97 [ -z "$head_from" ] || v_get_tdopt tdopt "$head_from"
  98 oneopt="-1"
  99 verbcmd=
 100 if [ -n "$verbose" ]; then
 101         oneopt=
 102         verbcmd='| awk "$script"'
 103 fi
 104 eval navigate_deps "$tdopt" "$oneopt" '-n -t -s="$steps" -r -- "$name"' "$verbcmd"