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#!/usr/bin/env tclsh
## -*- tcl -*-
# MAIN PROGRAM
#
# Usage:
# diff.tcl file1 file2
#
# Output:
# Puts out a list of lines consisting of:
# n1<TAB>n2<TAB>line
#
# where n1 is a line number in the first file, and n2 is a line number in the second file.
# The line is the text of the line. If a line appears in the first file but not the second,
# n2 is omitted, and conversely, if it appears in the second file but not the first, n1
# is omitted.
package require struct
# Open the files and read the lines into memory
set f1 [open [lindex $argv 0] r]
set lines1 [split [read $f1] \n]
close $f1
set f2 [open [lindex $argv 1] r]
set lines2 [split [read $f2] \n]
close $f2
set i 0
set j 0
::struct::list assign [::struct::list longestCommonSubsequence $lines1 $lines2] x1 x2
foreach p $x1 q $x2 {
while { $i < $p } {
set l [lindex $lines1 $i]
puts "[incr i]\t\t$l"
}
while { $j < $q } {
set m [lindex $lines2 $j]
puts "\t[incr j]\t$m"
}
set l [lindex $lines1 $i]
puts "[incr i]\t[incr j]\t$l"
}
while { $i < [llength $lines1] } {
set l [lindex $lines1 $i]
puts "[incr i]\t\t$l"
}
while { $j < [llength $lines2] } {
set m [lindex $lines2 $j]
puts "\t[incr j]\t$m"
}
exit
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