git-open-reverts

   1 #!/bin/sh
   2
   3 t=`mktemp`
   4 git log --pretty=raw "$@" > "$t"
   5
   6 allreverted=
   7 reverts()
   8 {
   9         commit=$1
  10         reverted=$2
  11         eval "reverts_in_$commit=\"\$reverts_in_$commit $reverted\""
  12         eval "reverts_$reverted=\"\$reverts_$reverted $commit\""
  13         allreverted="$allreverted $reverted"
  14         #echo >&2 "Found: $commit reverts $reverted"
  15 }
  16
  17 # in the tree of reverters, look for any leaves of even depth
  18
  19 reverters()
  20 {
  21         eval "echo \$reverts_$1"
  22 }
  23
  24 whatreverts_inverted()
  25 {
  26         local status reverter printme
  27         status=false
  28         printme=true
  29         for reverter in `reverters "$1"`; do
  30                 if ! whatreverts "$reverter"; then
  31                         status=true
  32                 fi
  33                 printme=false
  34         done
  35         if $printme; then
  36                 echo "$1"
  37         fi
  38         $status
  39 }
  40
  41 whatreverts()
  42 {
  43         local status reverter
  44         status=false
  45         for reverter in `reverters "$1"`; do
  46                 if ! whatreverts_inverted "$reverter"; then
  47                         status=true
  48                 fi
  49         done
  50         $status
  51 }
  52
  53 # pass 1: find which commit reverts which
  54 while IFS= read -r L; do
  55         case "$L" in
  56                 "commit "*)
  57                         commit="${L#commit }"
  58                         ;;
  59                 "    This reverts commit "*)
  60                         reverted=${L#    This reverts commit }
  61                         reverted=${reverted%.}
  62                         reverts "$commit" "$reverted"
  63                         ;;
  64         esac
  65 done < "$t"
  66
  67 # pass 2: for all reverted commits, find their status and their latest revert
  68 for commit in $allreverted; do
  69         if eval "[ -n \"\$seen_$commit\" ]"; then
  70                 continue
  71         fi
  72         eval "seen_$commit=1"
  73         if eval "[ -n \"\$reverts_in_$commit\" ]"; then
  74                 continue
  75         fi
  76         if revertedby=`whatreverts "$commit" | grep .`; then
  77                 echo "$commit got reverted by $revertedby:"
  78                 git log -1 $revertedby
  79         fi
  80 done
  81
  82 rm -f "$t"