code: plan9front

ref: 5622b0bbd878dbc34045cc6fd37cffa64461eabe
dir: /rc/bin/history/

#!/bin/rc
rfork e

nl='
'

fn prfile {
	echo -n `{date $flagu -f 'MMM DD hh:mm:ss ZZZ YYYY' `{walk -e m $1}}
	walk -e psM $1 | awk '{$NF="["$NF"]"; print " "$0}'
}

fn diffflags {
	t=()
	for(f in a b c e m n w) {
		flagname=flag$f
		if(~ $$flagname 1)
			t=(-$f $t)
	}
	echo $t
}

fn ysearch {
	if(~ $1 /*)
		file=$1
	if not
		file=`{pwd}^/$1

	if(test -f $file)
		prfile $file
	if not
		echo history: warning: $file does not exist >[1=2]

	old=()
	ls -Qqr /n/$dump/*/*/$file >[2] /dev/null |
	sed  's/\(([^ ]*) *([^ ]*) *([^ ]*)\)/\1\2\3/p' |
	awk '"/n/'$dump/$since'" <= $2 {next}
	     $1 != qid {
		qid=$1
		gsub($1"[ \t]+", "")
		print}' |
	while(new=`$nl{read}){
		prfile $new
		if (~ $flagD 1 && ~ $#old 1)
			diff `{diffflags} $new $old
		old=$new
	}
}

flagfmt='D,a,b,f,c,e,m,n,w,u,d:dump,s since'
args='[ -Dabcemnw ] [ -uf ] [ -d dumpfilesystem ] [ -s yyyymmdd ] files ...'
if(! ifs=() eval `{aux/getflags $*} || 
   ~ $#* 0 ||
   ! ~ $#dump 0 && ! ~ $#dump 1 ||
   ! ~ $#flags 0 && ! ~ $#flags 1) {
	aux/usage
	exit usage
}

if(~ $#dump 0)
	dump=dump

if(~ $#flags 0)
	flags=`{date -f 'YYYYMMDD'}

if(~ $#flagu 1)
	flagu=-u

since=`{date -f 'YYYY\/MMDD' `{seconds -f 'YYYYMMDD' $flags}}

9fs $dump

for(arg in $*)
	ysearch $arg