Import the non-pandoc manpage generator from redo.

This makes it easier (possible?) to generate sshuttle.8 from sshuttle.md on
MacOS.  We also import the git-enhanced version numbering magic so the
generated manpage can have a real version number.

version/.gitattributes

@@ -0,0 +1 @@
+gitvars.pre  export-subst

version/.gitignore

@@ -0,0 +1,3 @@
+/vars
+/gitvars
+/_version.py

version/__init__.py

@@ -0,0 +1 @@
+from _version import COMMIT, TAG, DATE

version/_version.py.do

@@ -0,0 +1,3 @@
+redo-ifchange vars
+cat vars
+

version/all.do

@@ -0,0 +1,2 @@
+redo-ifchange vars _version.py
+

version/clean.do

@@ -0,0 +1,3 @@
+rm -f *~ .*~ *.pyc _version.py vars gitvars
+
+

version/gitvars.do

@@ -0,0 +1,28 @@
+redo-ifchange gitvars.pre prodname
+
+read PROD <prodname
+exec >$3
+
+# Fix each line from gitvars.pre where git may or may not have already
+# substituted the variables.  If someone generated a tarball with 'git archive',
+# then the data will have been substituted already.  If we're in a checkout of
+# the git repo, then it won't, but we can just ask git to do the substitutions
+# right now.
+while read line; do
+	# Lines *may* be of the form: $Format: ... $
+	x=${line#\$Format:}  # remove prefix
+	if [ "$x" != "$line" ]; then
+		# git didn't substitute it
+		redo-always   # git this from the git repo
+		x=${x%\$}  # remove trailing $
+		if [ "$x" = "%d" ]; then
+			tag=$(git describe --match="$PROD-*")
+			x="(tag: $tag)"
+		else
+			x=$(git log -1 --pretty=format:"$x")
+		fi
+	fi
+	echo "$x"
+done <gitvars.pre
+
+redo-stamp <$3

version/gitvars.pre

@@ -0,0 +1,3 @@
+$Format:%H$
+$Format:%d$
+$Format:%ci$

version/prodname

@@ -0,0 +1 @@
+sshuttle

version/vars.do

@@ -0,0 +1,40 @@
+redo-ifchange gitvars prodname
+
+read PROD <prodname
+
+exec <gitvars
+read COMMIT
+read NAMES
+read DATE
+
+# the list of names is of the form:
+#   (x,y,tag: $PROD-####,tag: $PROD-####,a,b)
+# The entries we want are the ones starting with "tag: $PROD-" since those
+# refer to the right actual git tags.
+names_to_tag()
+{
+	x=${1#\(}
+	x=${x%\)}
+	cur=
+	while [ "$cur" != "$x" ]; do
+		x=${x# }
+		x=${x#tag: }
+		cur=${x%%,*}
+		tagpost=${cur#$PROD-}
+		if [ "$cur" != "$tagpost" ]; then
+			echo "$tagpost"
+			return 0
+		fi
+		x=${x#*,}
+	done
+	commitpost=${COMMIT#???????}
+	commitpre=${COMMIT%$commitpost}
+	echo "unknown-$commitpre"
+}
+
+
+sTAG=$(names_to_tag "$NAMES")
+
+echo "COMMIT='$COMMIT'"
+echo "TAG='$sTAG'"
+echo "DATE='${DATE%% *}'"