Plan 9 from Bell Labs’s /usr/web/sources/plan9/rc/bin/pc/defs

Copyright © 2021 Plan 9 Foundation.
Distributed under the MIT License.
Download the Plan 9 distribution.


nl='
'
tab='	'

fn prompt {
	def=()
	what=()
	if(~ $1 -d && ! ~ $#* 1){
		def=$2
		shift
		shift
	}

	optstr=()
	if(~ $1 -w && ! ~ $#* 1){
		optstr=$2
		shift
		shift
	}

	pr=$1
	shift

	opts=($*)
	if(~ $#opts 0) {
		suf=' '
	}
	if not if(! ~ $#optstr 0) {
		if(~ $optstr '') 
			suf=' '
		if not {
			pr=$pr^' ('^$"optstr^')'
			suf=''
		}
	}
	if not {
		pr=$pr^' ('^$1
		shift
		for(i)
			pr=$pr^', '^$i
		pr=$pr^')'
		suf=''
	}

	if(~ $#def 1)
		pr=$pr^$suf^'['^$def^']'
	pr=$pr^': '


	okay=no
	while(~ $okay no) {
# whatis opts
		echo -n $pr >[1=2]
		ifs='' {rd=`{read}}
		if(~ $#rd 0)
			exit notdone
		rd=`{echo $rd}
		if(~ $#rd 0 || ~ $rd '')
			rd=$def

		switch($#opts){
		case 0
			if(! ~ $rd '')
				okay=yes
		case *
			if(~ $rd $opts)
				okay=yes
		}
	}
	echo -n $rd >/env/rd	# just in case
}


Bell Labs OSI certified Powered by Plan 9

(Return to Plan 9 Home Page)

Copyright © 2021 Plan 9 Foundation. All Rights Reserved.
Comments to [email protected].