plan9fox/rc/bin/man
Ori Bernstein 5bc9b0c3ca improve usage messages (thanks henesy)
Fix inconsistencies between programs and their usage
messages,  correct instances where information seems
to be missing or lost. This  includes missing arguments,
making usage consistent with manuals, and so on.
2020-03-10 10:09:34 -07:00

158 lines
2.7 KiB
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Executable file

#!/bin/rc
# man - print manual pages
rfork e
. /sys/man/fonts
cmd=n
sec=()
S=/sys/man
d=0
fn roff {
preproc=()
postproc=cat
x=`{doctype $2}
if (~ $1 t) {
if(~ $x *grap*)
preproc=($preproc grap)
if(~ $x *pic*)
preproc=($preproc pic)
Nflag=-Tutf
}
if not {
Nflag='-N'
Lflag='-rL1000i'
# setting L changes page length to infinity (sed script removes empty lines)
if (grep -s '^\.(2C|sp *[0-9]*\.)' $2)
postproc=col
}
if(~ $x *eqn*)
preproc=($preproc eqn)
if(~ $x *tbl*)
preproc=($preproc tbl)
{echo -n $FONTS; cat $2 </dev/null} |
switch($#preproc) {
case 0
troff $Nflag $Lflag -$MAN
case 1
$preproc | troff $Nflag $Lflag -$MAN
case 2
$preproc(1) | $preproc(2) | troff $Nflag $Lflag -$MAN
case 3
$preproc(1) | $preproc(2) | $preproc(3) |
troff $Nflag $Lflag -$MAN
case *
$preproc(1) | $preproc(2) | $preproc(3) |
$preproc(4) | troff $Nflag $Lflag -$MAN
} | $postproc
}
fn page {
if(test -d /mnt/wsys/acme)
/bin/page -w
if not
/bin/page
}
search=yes
while(~ $d 0) {
if(~ $#* 0) {
echo 'usage: man [-bntpPSw] [0-9] [0-9] ... name1 name2 ...' >[1=2]
exit usage
}
if(test -d $S/$1){
sec=($sec $1)
shift
}
if not
switch($1) {
case -b ; cmd=b ; shift
case -n ; cmd=n ; shift
case -P ; cmd=P ; shift
case -p ; cmd=p ; shift
case -S ; search=no ; shift
case -t ; cmd=t ; shift
case -w ; cmd=w ; shift
case * ; d=1
}
}
if(~ $#sec 0) {
sec=`{ls -pd $S/[0-9]* }
}
ix=$S/$sec/INDEX
if(~ $#* 1) pat='^'^$1^' '
if not pat='^('^`{echo $* | sed 's/ /|/g'}^') '
fils=()
if(~ $search yes)
for(i in $S/$sec){
if(/bin/test -f $i/INDEX){
try=`{grep -i $pat $i/INDEX | sed 's/^[^ ]* //' | sort -u}
if(! ~ $#try 0)
fils=($fils $i/$try)
}
}
# bug: should also do following loop if not all pages found
if(~ $#fils 0) {
# nothing in INDEX. try for file of given name
for(i) {
if(~ $i intro) i=0intro
for(n in $sec) {
try=`{echo $S/$n/$i | tr A-Z a-z}
if (/bin/test -f $try)
fils=($fils $try)
}
}
if(~ $#fils 0) {
echo 'man: no manual page' >[1=2]
exit 'no man'
}
}
switch($cmd) {
case p; out=proof
case P; out=page
case *; out=cat
}
{
for(i in $fils) {
if(! /bin/test -f $i)
echo need $i >[1=2]
if not {
switch($cmd) {
case w
echo $i
case t
roff t $i
case p
roff t $i | grep -v '^x X html'
case P
roff t $i
case n
roff n $i | sed '
${
/^$/p
}
//N
/^\n$/D'
case b
x=`{echo $i | sed 's;/sys/man/(.*)/(.*);\1 \2;'}
if(~ $x(2) 0intro) x=($x(1) intro)
roff n $i | sed '
${
/^$/p
}
//N
/^\n$/D' |
plumb -i -d edit -a 'action=showdata filename=/man/'$x(2)^'('$x(1)^')'
}
}
}
} | $out