prepare for refactoring to perl

diff --git a/make_patchnum.pl b/make_patchnum.pl
new file mode 100644 (file)
index 0000000..7eb6515
--- /dev/null
+++ b/make_patchnum.pl
@@ -0,0 +1,97 @@
+#!/bin/sh
+
+# this script is used to regenerate a number of special build files
+# based on either information contained in a file called .patch or
+# directly from git.
+# The files involved are:
+#   .patchnum         # information about the current checkout
+#   lib/Config_git.pl # holds some special configure settings related to git
+#   unpushed.h        # header file used by patchlevel.h to store unpushed commits
+
+existing_patchnum=$(cat .patchnum 2>/dev/null)
+existing_config=$(cat lib/Config_git.pl 2>/dev/null)
+existing_unpushed=$(cat unpushed.h 2>/dev/null)
+
+unpushed_commits='/*no-op*/'
+if [ -s ".patch" ] ; then
+       # this is the minimal expectation for the 
+       read branch snapshot_created commit_id describe < .patch
+       changed=""
+       extra_info="git_snapshot_date='$snapshot_created'"
+       commit_title='Snapshot of:'
+elif [ -d ".git" ]; then
+       branch=$(git branch | awk 'BEGIN{ORS=""} /\*/ { print $2 }')
+       test -n "$branch" && remote=$(git config branch.$branch.remote)
+       commit_id=$(git rev-parse HEAD)
+       changed=$(git diff-index --name-only HEAD)
+       describe=$(git describe --tags)
+       commit_created=$(git log -1 --pretty='format:%ci')
+       extra_info="git_commit_date='$commit_created'"
+       if [ -n "$branch" ] && [ -n "$remote" ]; then
+               unpushed_commit_list=$(git cherry $remote/$branch | awk 'BEGIN{ORS=","} /+/ {print $2}' | sed -e 's/,$//')
+               unpushed_commits=$(git cherry $remote/$branch | awk 'BEGIN{ORS="\t\\\n"} /+/ {print ",\"" $2 "\""}')
+
+               if [ -n "$unpushed_commits" ]; then
+                       commit_title="Local Commit:"
+                       ancestor=`git rev-parse $remote/$branch`
+                       extra_info="$extra_info
+git_ancestor='$ancestor'
+git_unpushed='$unpushed_commit_list'"
+               fi
+                       
+       fi
+else
+       cat <<SNDOGS
+Something is wrong with your source tree. You should 
+either have a .git directory and a functional git toolset
+OR should have a .patch file in the source tree. Please
+report the particulars of this situation to 
+perl5-porters@perl.org.
+SNDOGS
+       exit 2
+fi
+
+# Set up defaults for various values
+new_patchnum="describe: $describe"
+if [ -n "$changed" ]; then
+       changed="true"
+       commit_title="Derived from:"
+       new_patchnum="$new_patchnum
+status: uncommitted-changes"
+fi
+test -z "$commit_title" && commit_title='Commit id:'
+
+new_unpushed=$(cat <<EOFTEXT
+/*********************************************************************
+* WARNING: unpushed.h is automatically generated by make_patchnum.sh *
+*          DO NOT EDIT DIRECTLY - edit make_patchnum.sh instead      *
+*********************************************************************/
+#define PERL_GIT_UNPUSHED_COMMITS       $unpushed_commits
+/*leave-this-comment*/
+EOFTEXT
+)
+new_config=$(cat <<EOFDATA
+#################################################################
+# WARNING: lib/Config_git.pl is generated by make_patchnum.sh   #
+#          DO NOT EDIT DIRECTLY - edit make_patchnum.sh instead #
+#################################################################
+\$Config::Git_Data=<<'ENDOFGIT';
+git_commit_id='$commit_id'
+git_describe='$describe'
+git_branch='$branch'
+git_uncommitted_changes='$changed'
+git_commit_id_title='$commit_title'
+$extra_info
+ENDOFGIT
+EOFDATA
+)
+# only update the files if necessary, other build product depends on these files
+if [ "$existing_patchnum" != "$new_patchnum" ] || [ "$new_config" != "$existing_config" ] || [ "$existing_unpushed" != "$new_unpushed" ]; then
+       echo "Updating .patchnum and lib/Config_git.pl"
+       echo "$new_patchnum" > .patchnum
+       echo "$new_config" > lib/Config_git.pl
+       echo "$new_unpushed" > unpushed.h
+else
+       echo "Reusing .patchnum and lib/Config_git.pl"
+fi
+