Squashed 'cde/programs/dtksh/ksh93/' content from commit b16c91f01

git-subtree-dir: cde/programs/dtksh/ksh93
git-subtree-split: b16c91f0120895eaae2618e821cac5b4eda27ac2

bin/Mamfile_indent

@@ -0,0 +1,33 @@
+#!/usr/bin/env sh
+IFS=''; set -fCu  # safe mode: no split/glob = no quoting headaches
+let() { return $((!($1))); }
+
+# Automatically (re-)indent make...done blocks in a Mamfile.
+# Usage: Mamfile_indent <Mamfile >Mamfile.new
+#
+# Should work on all current POSIX compliant shells.
+# By Martijn Dekker <martijn@inlv.org>, 2021. Public domain.
+
+# Spacing per indentation level. Edit to change style.
+indent='	'  # one tab
+
+# Remove existing indentation, add new indentation.
+indentlvl=0
+sed 's/^[[:space:]]*//' \
+| while read -r line
+do	case $line in
+	'')	continue ;;
+	done*)	let "indentlvl -= 1" ;;
+	esac
+
+	spc=
+	i=0
+	while	let "(i += 1) <= indentlvl"
+	do	spc=$indent$spc
+	done
+	printf '%s\n' $spc$line
+
+	case $line in
+	make*)	let "indentlvl += 1" ;;
+	esac
+done