diff options
Diffstat (limited to 'toc')
| -rwxr-xr-x | toc/toc | 53 |
1 files changed, 27 insertions, 26 deletions
@@ -1,51 +1,52 @@ #!/bin/sh - +# # toc -- run troff in three passes - +# # Permission to use, copy, modify and/or # distribute this software for any purpose # with or without fee is hereby granted. +# -usage() { +if [ $# -eq 0 ]; then echo "usage: $0 [cmd ... \|] <troff> [arg ...]" 1>&2 echo "(input should be given on stdin)" 1>&2 exit 1 -} +fi -tmp() { +# Create temporary files. +FILES= +for t in f g h i j; do x=`mktemp` || exit $? - RM=$RM\ $x - eval $1=\$x -} - -end() { - cat $1 - exit $s -} - -RM=rm + FILES="$FILES $x" + eval $t=\$x +done +trap 'rm $FILES; trap -' INT QUIT EXIT + +# +# An awk script separates toc output from troff output. +# The former is printed on standard out, while the latter +# is printer on standard error. +# AWK=' /^\(toc\)/ { print substr($0, 6); next } { print > "/dev/stderr" } ' -[ $# -eq 0 ] && usage -trap '$RM; RM=; exit 130' INT -trap '$RM' EXIT -for t in f g h i j; do tmp $t; done - +# +# Troff is run as many times as needed, at most three. +# Toc output is saved in a temporary file. After each pass, an +# analysis of the output determines whether more passes are needed. +# +# The script always exits with the status code of the last troff pass. +# echo $0: first pass 1>&2 - tee $f | { eval "$@" -rte=1 -dtf=; s=$?; } 2>&1 1>$i | awk "$AWK" >$g -[ -s $g ] || end $i +[ -s $g ] || { cat $j; exit $s; } 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 +diff -q $g $h >/dev/null && { cat $j; exit $s; } echo $0: third pass 1>&2 - { eval "$@" -rte=0 -dtf=$h; s=$?; } <$f | grep -v '^(toc)' - exit $s |