git-gui/CREDITS-GEN

   1 #!/bin/sh
   2
   3 CF=CREDITS-FILE
   4 tip=
   5
   6 tree_search ()
   7 {
   8         head=$1
   9         tree=$2
  10         for p in $(git rev-list --parents --max-count=1 $head 2>/dev/null)
  11         do
  12                 test $tree = $(git rev-parse $p^{tree} 2>/dev/null) &&
  13                 vn=$(git describe --abbrev=4 $p 2>/dev/null) &&
  14                 case "$vn" in
  15                 gitgui-[0-9]*) echo $p; break;;
  16                 esac
  17         done
  18 }
  19
  20 generate_credits ()
  21 {
  22         tip=$1 &&
  23         rm -f "$2" &&
  24         git shortlog -n -s $tip | sed 's/: .*$//' >"$2" || exit
  25 }
  26
  27 # Always use the tarball credits file if found, just
  28 # in case we are somehow contained in a larger git
  29 # repository that doesn't actually track our state.
  30 # (At least one package manager is doing this.)
  31 #
  32 # We may be a subproject, so try looking for the merge
  33 # commit that supplied this directory content if we are
  34 # not at the toplevel.  We probably will always be the
  35 # second parent in the commit, but we shouldn't rely on
  36 # that fact.
  37 #
  38
  39 credits_tmp=/var/tmp/gitgui-credits-$$
  40 trap 'rm -f "$credits_tmp"' 0
  41
  42 orig="$credits_tmp"
  43
  44 if test -f credits
  45 then
  46         orig=credits
  47 elif prefix="$(git rev-parse --show-prefix 2>/dev/null)" &&
  48    test -n "$prefix" &&
  49    head=$(git rev-list --max-count=1 HEAD -- . 2>/dev/null) &&
  50    tree=$(git rev-parse --verify "HEAD:$prefix" 2>/dev/null) &&
  51    tip=$(tree_search $head $tree) &&
  52    test -n "$tip"
  53 then
  54         generate_credits $tip "$orig" || exit
  55 elif tip="$(git rev-parse --verify HEAD 2>/dev/null)" &&
  56    test -n "$tip"
  57 then
  58         generate_credits $tip "$orig" || exit
  59 else
  60         echo "error: Cannot locate authorship information." >&2
  61         exit 1
  62 fi
  63
  64 if test -f "$orig" && cmp -s "$orig" "$CF"
  65 then
  66         : noop
  67 else
  68         rm -f "$CF" &&
  69         cat "$orig" >"$CF"
  70 fi
  71