#!/usr/bin/env osh
:
: osh - " Force sh(1), csh(1), and other shells to exit w/ error! " <'' ;;;
:
: "  @(#)$Id: 32f9e7cf9259254c6d78aae156cb9559cc210585 $  "
:
: "  The author of this file, J.A. Neitzel <jan (at) v6shell (dot) org>,  "
: "  hereby grants it to the public domain.                               "
:

trap '' 13 ; umask 77

: >>$0'' <'' ; : >>$1'' <'' ; : >>$2'' <'' ; killer $0 history
if \( \
	$# = 0 -o X$1 = X-l -o X$1 = X-n -o X$1 = X-p \
   \) -a ! \( \
	-f $h/.osh.history -a -r $h/.osh.history -a -w $h/.osh.history \
   \) if { exit } perror $0 $h/.osh.history'": cannot open"'

if $# = 0 goto -a
if \( \( X$1 = X-c -o X$1 = X-l -o X$1 = X-r \) -a $# = 1 \) -o \
   \( \( X$1 = X-n -o X$1 = X-p              \) -a $# = 2 -a X$2 != X \) goto $1
if X$1 = X-h -a $# = 1 goto $1
if { exit } \
	pusage $0 '"[-c | -h | -l | -n number1[,number2] | -p pattern | -r]"'

: -a
	wc -l <$h/.osh.history | tr -d ' \t' | \
		sed 's,.*,expr & \\>= 1 >/dev/null,' | osh
	if $? != 0 if { exit } false
	echo 'Number	Command Line' ; echo '------	------------'
	fd2 -f /dev/null ncat <$h/.osh.history ; exit

: -c
	( : ) >$h/.osh.history ; exit

: -h
	perror $0 '"Formatting history help..."'
	if ! { printenv PAGER } goto more-s >/dev/null
	printenv PAGER | wc -c | tr -d ' \t' | grep '^1$' >/dev/null
	if $? = 0 goto more-s
		printenv PAGER | sed 's,.*,exec & '$0'.help,' | osh ; exit
	: more-s
		more -s $0.help ; exit

: -l
	wc -l <$h/.osh.history | tr -d ' \t' | \
		sed 's,.*,expr & \\>= 11 >/dev/null,' | osh
	if $? != 0 if { exit } false
	echo 'Number	Command Line' ; echo '------	------------'
	ncat <$h/.osh.history | tail -11 | head -10 ; exit

: -n
	fd2 -f /dev/null \
		ncat <$h/.osh.history | fd2 -f /dev/null -- sed -n $2p | \
			wc -l | tr -d ' \t' | grep '^0$' >/dev/null
	if $? = 0 if { exit } false
	echo 'Number	Command Line' ; echo '------	------------'
	ncat <$h/.osh.history | sed -n $2p ; exit

: -p
	ncat <$h/.osh.history | egrep -- $2 | grep -v 'history -p' | \
		wc -l | tr -d ' \t' | grep '^0$' >/dev/null
	if $? = 0 if { exit } false
	echo 'Number	Command Line' ; echo '------	------------'
	ncat <$h/.osh.history | egrep -- $2 | grep -v 'history -p' ; exit

: -r
	rm -f $h/.osh.history