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############################################################################
#
# File: when.icn
#
# Subject: Program to show file age
#
# Author: Chris Tenaglia
#
# Date: August 14, 1996
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This one was developed for UNIX (namely ULTRIX 4.3 rev 44). Maybe
# it will work on some other UNIX too. I'd like to know. This program
# is called 'when'. It's like a date based ls command. Some have told
# me 'find' can do the same things, but I find find a bit arcane?
#
# So 'when' is what I use. Here are some samples:
#
# when before 4/12/92 # files before a date
# when before 300 # files older than an age
# when after 3/25 # or younger than a date this year
# when before 2/1/94 and after 10/31/93 # even a range
#
# More options and clauses are supported. Look at the code for clues.
# This one only works in the current directory. It also has an interesting
# property. Maybe this is just ULTRIX, maybe not, I'd like to know anyway...
# The interpreted version works fine, but the compiled version has a
# numeric overflow. That'll make for some fun debugging. I wrote it for
# myself as a tool to locate old files for archiving or deleting. Study and
# enjoy!
#
############################################################################
#
# Requires: UNIX
#
############################################################################
global base, # 1970 calculation baseline number
today, # displacement from 12:00:01am today
now, # upto the second mark for right now
method, # ascending or descending order
output, # long (ls -al) or brief (ls -1) style
command, # optional command to do on each file
files # list with files, sizes, and ages
procedure main(param)
local i, option, j
calc_today()
files := directory()
method := "none"
output := "long"
command := ""
if *param = 0 then show_age()
every i := 1 to *param do
{
(option := param[i]) | break
case option of
{
"to" |
"before" |
"until" : {
files := before(files,param[i+1])
i +:= 1
}
"from" |
"since" |
"after" : {
files := since(files,param[i+1])
i +:= 1
}
"asc" : method:="ascending"
"des" : method:="descending"
"long" : output:="long"
"brief" : output:="brief"
"do" : {
every j := i+1 to *param do
command ||:= param[j] || " "
}
default : 5 # stop("Unrecognized option :",option)
}
}
show_age()
end
#
# just show another ls with days old numbers & optionally sorts
#
procedure show_age()
local line, age, ks, file, text, results, i
case method of
{
"none" : {
every line := !files do
{
age := (today - parse(line,' ')[1]) / 86400
ks := parse(line,' ')[2] / 1024
file:= line[23:0]
(command == "") |
{
write(command,line[37:0])
system(command || line[37:0])
next
}
if output == "brief" then text := line[37:0]
else text:= right(age,6) || " days " || right(ks,6) || " kb | " || file
write(text)
}
}
"descending" : {
results := sort(files)
every line := !results do
{
age := (today - parse(line,' ')[1]) / 86400
ks := parse(line,' ')[2] / 1024
file:= line[23:0]
(command == "") |
{
write(command,line[37:0])
system(command || line[37:0])
next
}
if output == "brief" then text := line[37:0]
else text:= right(age,6) || " days " || right(ks,6) || " kb | " || file
write(text)
}
}
"ascending" : {
results := sort(files)
every i := *results to 1 by -1 do
{
line:= results[i]
age := (today - parse(line,' ')[1]) / 86400
ks := parse(line,' ')[2] / 1024
file:= line[23:0]
(command == "") |
{
write(command,line[37:0])
system(command || line[37:0])
next
}
if output == "brief" then text := line[37:0]
else text:= right(age,6) || " days " || right(ks,6) || " kb | " || file
write(text)
}
}
default : 5
}
end
#
# remove elements later than a date
#
procedure before(lst,days)
local i, mo, da, yr, tmp, dd, age, work, file, old
static mtab
initial mtab := [0,31,59,90,120,151,181,212,243,273,304,334]
if find("/",days) then
{
mo := parse(days,'/')[1]
da := parse(days,'/')[2]
yr := parse(days,'/')[3] | parse(&date,'/')[1]
if yr < 100 then yr +:= 1900
tmp := yr * 31557600
dd := mtab[mo] + da
if ((yr % 4) = 0) & (mo > 2) then dd +:= 1
tmp+:= dd * 86400
age := tmp
} else {
age := now - (days * 86400)
}
work := []
every file := !lst do
{
old := parse(file,' ')[1]
if old <= age then put(work,file)
}
return copy(work)
end
#
# remove elements earlier than a date
#
procedure since(lst,days)
local mo, da, yr, tmp, dd, age, work, file, old
static mtab
initial mtab := [0,31,59,90,120,151,181,212,243,273,304,334]
if find("/",days) then
{
mo := parse(days,'/')[1]
da := parse(days,'/')[2]
yr := parse(days,'/')[3] | parse(&date,'/')[1]
if yr < 100 then yr +:= 1900
tmp := yr * 31557600
dd := mtab[mo] + da
if ((yr % 4) = 0) & (mo > 2) then dd +:= 1
tmp+:= dd * 86400
age := tmp
} else {
age := now - (days * 86400)
}
work := []
every file := !lst do
{
old := parse(file,' ')[1]
if old >= age then put(work,file)
}
return copy(work)
end
#
# calculate today and now figures
#
procedure calc_today()
local tmpy, tmpm, tmpd, here
static mtab
initial {
base := 1970*31557600
mtab := [0,31,59,90,120,151,181,212,243,273,304,334]
}
tmpy := parse(&date,'/')[1]
tmpm := parse(&date,'/')[2]
tmpd := parse(&date,'/')[3]
here := tmpy * 31557600 +
(mtab[tmpm] + tmpd) * 86400
if ((tmpy%4) = 0) & (tmpm > 2) then here +:= 86400
today := here
now := here +
parse(&clock,':')[1] * 3600 +
parse(&clock,':')[2] * 60 +
parse(&clock,':')[3]
end
#
# convert a ls -al output into a list for sorting and printing
#
procedure directory()
local pipe, entries, line, size, file, day, year, sec, mark, text
static mtab
initial {
mtab := table(0)
mtab["Jan"] := 0
mtab["Feb"] := 31
mtab["Mar"] := 59
mtab["Apr"] := 90
mtab["May"] := 120
mtab["Jun"] := 151
mtab["Jul"] := 181
mtab["Aug"] := 212
mtab["Sep"] := 243
mtab["Oct"] := 273
mtab["Nov"] := 304
mtab["Dec"] := 334
}
pipe := open("ls -al","pr")
entries := []
every line := !pipe do
{
if any('dclst',line) then next # ignore info and dirs
size := parse(line,' ')[4]
file := line[33:0]
day := mtab[parse(line,' ')[5]] + parse(line,' ')[6]
year := if line[40] == " " then parse(line,' ')[7] else parse(&date,'/')[1]
sec := if line[40] == " " then 0 else hhmm(parse(line,' ')[7])
mark := year * 31557600 + day * 86400 + sec
if (now-mark) < 0 then mark -:= 31557600
text := right(mark,12) || right(size,10) || " " || file
put(entries,text)
}
close(pipe)
return entries
end
#
# convert hh:mm into seconds since midnight
#
procedure hhmm(str)
local hh, mm
hh := str[1+:2]
mm := str[4+:2]
return hh*3600 + mm*60
end
#
# parse a string into a list with respect to a delimiter
#
procedure parse(line,delims)
local tokens
static chars
chars := &cset -- delims
tokens := []
line ? while tab(upto(chars)) do put(tokens,tab(many(chars)))
return tokens
end
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