From bffbccd88aa57541bffca931c6a4c205773ad619 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Wed, 23 Jun 2021 20:55:06 +0200
Subject: toc: Change toc script usage, skip unnecessary passes

---
 Makefile     |  2 +-
 toc/Makefile |  8 ++++----
 toc/gtoc     |  4 ----
 toc/toc      | 46 ++++++++++++++++++++++++++++++++--------------
 4 files changed, 37 insertions(+), 23 deletions(-)
 delete mode 100755 toc/gtoc

diff --git a/Makefile b/Makefile
index b3686c0..5ffed1e 100644
--- a/Makefile
+++ b/Makefile
@@ -5,4 +5,4 @@ hacking.pdf: hacking.t g.tmac
 	groff -Tps | ps2pdf - > hacking.pdf
 
 README.pdf: README.t g.tmac
-	toc/gtoc -Tps README.t | ps2pdf - > README.pdf
+	<README.t toc/toc groff -Tps | ps2pdf - > README.pdf
diff --git a/toc/Makefile b/toc/Makefile
index 6b6468f..d6d2a6e 100644
--- a/toc/Makefile
+++ b/toc/Makefile
@@ -1,5 +1,5 @@
-README.pdf: README.t toc.tmac toc gtoc
-	./gtoc -Tps README.t | ps2pdf - > README.pdf
+README.pdf: README.t toc.tmac toc
+	<README.t ./toc groff -Tps | ps2pdf - > README.pdf
 
-example.pdf: example.t toc.tmac toc gtoc
-	./gtoc -Tps example.t | ps2pdf - > example.pdf
+example.pdf: example.t toc.tmac toc
+	<example.t ./toc groff -Tps | ps2pdf - > example.pdf
diff --git a/toc/gtoc b/toc/gtoc
deleted file mode 100755
index f64ddbe..0000000
--- a/toc/gtoc
+++ /dev/null
@@ -1,4 +0,0 @@
-#!/bin/sh
-export TROFF=groff
-exec=${0%gtoc}toc
-exec "$exec" "$@"
diff --git a/toc/toc b/toc/toc
index d3de1a5..4e1f298 100755
--- a/toc/toc
+++ b/toc/toc
@@ -2,12 +2,17 @@
 
 # toc -- run troff in three passes
 
-: ${TROFF:=troff}
-SED='sed -n /^(toc)/{s///;p}'
 RM=rm
-
-trap '$RM; RM=; exit 130' INT
-trap '$RM' EXIT
+AWK='
+	/^\(toc\)/ { print substr($0, 6); next }
+	{ print > "/dev/stderr" }
+'
+
+usage() {
+1>&2	echo "usage: $0 [cmd ... \|] <troff> [arg ...]"
+1>&2	echo "(input should be given on stdin)"
+	exit 1
+}
 
 tmp() {
 	x=`mktemp` || exit $?
@@ -15,19 +20,32 @@ tmp() {
 	eval $1=\$x
 }
 
-if [ ! -t 0 ]; then
-	tmp f
-	cat > $f
-	set -- "$@" $f
-fi
+end() {
+	cat $1
+	exit $s
+}
+
+[ $# -eq 0 ] && usage
+trap '$RM; RM=; exit 130' INT
+trap '$RM' EXIT
+
+tmp f
+>$f cat
 
 tmp g
 tmp h
+tmp i
+tmp j
+
+echo $0: first pass 1>&2
+{ eval "$@" -rte=1 -dtf=; s=$?; } <$f 2>&1 1>$i | awk "$AWK" >$g
+[ -s $g ] || end $i
 
-$TROFF -rte=1 -dtf= "$@"	2>&1 1>/dev/null	| $SED >$g
-$TROFF -rte=1 -dtf=$g "$@"	2>&1 1>/dev/null	| $SED >$h
-$TROFF -rte=0 -dtf=$h "$@"
+echo $0: second pass 1>&2
+{ eval "$@" -rte=1 -dtf=$g; s=$?; } <$f 2>&1 1>$j | awk "$AWK" >$h
+diff -q $g $h >/dev/null && end $j
 
-s=$?
+echo $0: third pass 1>&2
+{ eval "$@" -rte=0 -dtf=$h; s=$?; } <$f | grep -v '^(toc)'
 
 exit $s
-- 
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