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#!/usr/bin/tcl
#
# Replace string with another string -OR- include
# only lines successfully modified with a regular
# expression.
#
fconfigure stdout -translation binary -encoding binary
fconfigure stderr -translation binary -encoding binary
set mode [string tolower [lindex $argv 0]]
set from [lindex $argv 1]
set to [lindex $argv 2]
if {-1 == [lsearch -exact [list exact regsub include] $mode]} {exit 1}
if {[string length $from]==0} {exit 2}
while {![eof stdin]} {
set line [gets stdin]
if {[eof stdin]} break
switch -exact $mode {
exact {set line [string map [list $from $to] $line]}
regsub {regsub -all -- $from $line $to line}
include {if {[regsub -all -- $from $line $to line]==0} continue}
}
puts stdout $line
}
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