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############################################################################
#
# File: diffu.icn
#
# Subject: Program to show differences in files
#
# Author: Rich Morin
#
# Date: January 3, 1993
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program exercises the dif() procedure, making it act like the
# UNIX diff(1) file difference command.
#
# Usage: diffu f1 f2
#
# 3d2
# < c
# 7,8c6,7
# < g
# < h
# ---
# > i
# > j
#
############################################################################
#
# Links: dif
#
############################################################################
link dif
invocable all
procedure main(arg)
local f1, f2, ldr, n1, p1, n2, p2, h
if *arg ~= 2 then
zot("usage: diffu f1 f2")
f1 := open(arg[1]) | zot("cannot open " || arg[1])
f2 := open(arg[2]) | zot("cannot open " || arg[2])
every ldr := dif([f1,f2]) do {
n1 := *ldr[1].diffs; p1 := ldr[1].pos
n2 := *ldr[2].diffs; p2 := ldr[2].pos
if n1 = 0 then { # add lines
h := p1-1 || "a" || p2
if n2 > 1 then
h ||:= "," || (p2 + n2 - 1)
write(h)
every write("> " || !ldr[2].diffs)
}
else if n2 = 0 then { # delete lines
h := p1
if n1 > 1 then
h ||:= "," || (p1 + n1 - 1)
h ||:= "d" || p2-1
write(h)
every write("< " || !ldr[1].diffs)
}
else { # change lines
h := p1
if n1 > 1 then
h ||:= "," || (p1 + n1 - 1)
h ||:= "c" || p2
if n2 > 1 then
h ||:= "," || (p2 + n2 - 1)
write(h)
every write("< " || !ldr[1].diffs)
write("---")
every write("> " || !ldr[2].diffs)
}
}
end
procedure zot(msg) # exit w/message
write(&errout, "diff: " || msg)
exit(1)
end
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