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############################################################################
#
# File: gediff.icn
#
# Subject: Program to "diff" for use with ged
#
# Author: Robert J. Alexander
#
# Date: July 9, 1993
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# Program to produce diff output in a format for use with ged's
# "FindFileAndLine" (esc-S) command. It causes the "diffed" files
# to be open in the editor with the differing portions selected.
#
############################################################################
#
# Links: options, word
#
############################################################################
#
# Requires: pipes, a "diff" command in the environment
#
############################################################################
#
# See also: diffn.icn (a diff-type program)
#
############################################################################
link options,word
global Diff,ArgStr
procedure Options(arg)
local opt,c
opt := options(arg,"dbitwrsS:")
Diff := \opt["d"] | "diff"
ArgStr := ""
ArgStr ||:= " -S " || \opt["S"]
every c := !"bitwrs" do { # single-character options passed to diff
if \opt[c] then ArgStr ||:= " -" || c
}
return opt
end
procedure main(arg)
local argstr,fn1,fn2,p,dargs,cmd
Options(arg)
every ArgStr ||:= " " || !arg
fn1 := arg[-2]
fn2 := arg[-1]
cmd := Diff || ArgStr
#write(&errout,cmd)
p := open(cmd,"pr")
while read(p) ? {
if any(&digits) then {
write(fn1,":",tab(upto(&letters)))
move(1)
write(fn2,":",tab(0))
}
else if ="diff" & tab(many(' \t')) then {
write(&subject)
dargs := []
while put(dargs,word_dequote(tab(word()))) do tab(many(' \t'))
fn1 := dargs[-2]
fn2 := dargs[-1]
while match("./",fn1) do fn1[1+:2] := ""
while match("./",fn2) do fn2[1+:2] := ""
}
else write(tab(0))
{}
}
exit(close(p))
end
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