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#!/usr/local/plan9/bin/rc
. 9.rc
smon='s/Jan/01/
s/Feb/02/
s/Mar/03/
s/Apr/04/
s/May/05/
s/Jun/06/
s/Jul/07/
s/Aug/08/
s/Sep/09/
s/Oct/10/
s/Nov/11/
s/Dec/12/'
fn usage {
echo 'usage: yesterday [-cd] [-[[yy]yy]mm]dd] [-n daysago] file ...' >[1=2]
exit 1
}
fn Xcp {
echo cp $1 $2
cp $1 $2
}
fn Xcarefulcp {
if(! cmp -s $1 $2) Xcp $1 $2
}
fn Xdiff {
echo diff -c $1 $2
diff -c $1 $2
}
fn Xecho {
echo $1
}
year=`{date|sed 's/.* //'}
copy=Xecho
last=()
while(! ~ $#* 0 && ~ $1 -* && ! ~ $1 --){
switch($1){
case -c
copy=Xcp
shift
case -d
copy=Xdiff
shift
case -C
copy=Xcarefulcp
shift
case -n*
if(~ $1 -n){
if(~ $#* 1)
usage
shift
days=$1
}
if not
days=`{echo $1 | sed 's/^-.//'}
last=`{date `{hoc -e `{date -n} ^ '-'$days'*60*60*24'} | \
sed -e 's%... (...) (..) ..:..:.. ... (....)%\3/\1\2%' -e 'y/ /0/' -e $smon}
shift
case -[0-9]
mon=`{date|9 sed 's/^....(...).*/\1/' -e $smon}
last=$year/$mon ^`{echo $1|sed 's/^-/0/'}
shift
case -[0-9][0-9]
mon=`{date|9 sed 's/^....(...).*/\1/' -e $smon}
last=$year/$mon ^`{echo $1|9 sed 's/^-//'}
shift
case -[0-9][0-9][0-9][0-9]
last=$year/ ^ `{echo $1|9 sed 's/^-//'}
shift
case -[0-9][0-9][0-9][0-9][0-9][0-9]
last=`{echo $year|9 sed 's/..$//'} ^ `{echo $1|9 sed 's/^-(..)/\1\//'}
shift
case -[0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9]
last=`{echo $1|9 sed 's/^-(....)/\1\//'}
shift
case *
usage
}
}
if(! ~ $#* 0 && ~ $1 --)
shift
if(~ $#* 0)
usage
dir=`{pwd}
if(! ~ $status ''){
echo 'yesterday: can''t find directory' >[1=2]
exit 'pwd failed'
}
h=`{hostname}
switch($h){
case amsterdam
xdump=/dump/am
case *
if(! test -d /dump/$h){
echo 'no dumps on '^`{hostname} >[1=2]
exit 1
}
xdump=/dump/$h
}
for(i){
xpath=$i
if(! ~ $xpath /*)
xpath=`{9 cleanname -d `{pwd} $i}
dumppath=$xpath
if(~ $#last 0)
xlast=`{9 ls -t $xdump/$year|sed 1q}
if not
xlast=$xdump/$last
$copy $xlast^$dumppath $xpath
}
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