string_list: add a function string_list_remove_empty_items()

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index 178e45305d2b66bbe5a0c0902d989ea66888869b..53142492afcfb92f0453359af9a00a045c51e7e9 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -64,37 +64,19 @@ EOF
 
 eval "$functions"
 
-# When piped a commit, output a script to set the ident of either
-# "author" or "committer
+finish_ident() {
+       # Ensure non-empty id name.
+       echo "case \"\$GIT_$1_NAME\" in \"\") GIT_$1_NAME=\"\${GIT_$1_EMAIL%%@*}\" && export GIT_$1_NAME;; esac"
+       # And make sure everything is exported.
+       echo "export GIT_$1_NAME"
+       echo "export GIT_$1_EMAIL"
+       echo "export GIT_$1_DATE"
+}
 
 set_ident () {
-       lid="$(echo "$1" | tr "[A-Z]" "[a-z]")"
-       uid="$(echo "$1" | tr "[a-z]" "[A-Z]")"
-       pick_id_script='
-               /^'$lid' /{
-                       s/'\''/'\''\\'\'\''/g
-                       h
-                       s/^'$lid' \([^<]*\) <[^>]*> .*$/\1/
-                       s/'\''/'\''\'\'\''/g
-                       s/.*/GIT_'$uid'_NAME='\''&'\''; export GIT_'$uid'_NAME/p
-
-                       g
-                       s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/
-                       s/'\''/'\''\'\'\''/g
-                       s/.*/GIT_'$uid'_EMAIL='\''&'\''; export GIT_'$uid'_EMAIL/p
-
-                       g
-                       s/^'$lid' [^<]* <[^>]*> \(.*\)$/@\1/
-                       s/'\''/'\''\'\'\''/g
-                       s/.*/GIT_'$uid'_DATE='\''&'\''; export GIT_'$uid'_DATE/p
-
-                       q
-               }
-       '
-
-       LANG=C LC_ALL=C sed -ne "$pick_id_script"
-       # Ensure non-empty id name.
-       echo "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac"
+       parse_ident_from_commit author AUTHOR committer COMMITTER
+       finish_ident AUTHOR
+       finish_ident COMMITTER
 }
 
 USAGE="[--env-filter <command>] [--tree-filter <command>]
@@ -320,10 +302,8 @@ while read commit parents; do
        git cat-file commit "$commit" >../commit ||
                die "Cannot read commit $commit"
 
-       eval "$(set_ident AUTHOR <../commit)" ||
-               die "setting author failed for commit $commit"
-       eval "$(set_ident COMMITTER <../commit)" ||
-               die "setting committer failed for commit $commit"
+       eval "$(set_ident <../commit)" ||
+               die "setting author/committer failed for commit $commit"
        eval "$filter_env" < /dev/null ||
                die "env filter failed: $filter_env"