##Eskil Plugin : Compare after filtering lines
## Option -grepre : Regexp to filter on
#
# This plugin only compares lines that match a regexp pattern.
# Example usage:
# eskil -plugin grep -grepre "<t>" f1 f2
# Example file for a plugin.
# A plugin's first line must start exactly like this one.
# The text after : is the summary you can get at the command line
# A plugin may declare command line options that should be allowed through
# to ::argv
# A plugin must define this procedure to do the job.
# side: left or right
# chi: An input channel for reading the original file.
# cho: An output channel for writing the processed file.
proc PreProcess {side chi cho} {
if {[catch {llength $::Info}]} {
puts $cho "Grep plugin needs -plugininfo parameter to be a list"
return 1
}
# Look for parameters in info string
set opts(-re) "."
foreach {opt val} $::Info {
set opts($opt) $val
}
# And on command line
set i [lsearch -exact $::argv -grepre]
if {$i >= 0} {
incr i
set opts(-re) [lindex $::argv $i]
}
while {[gets $chi line] >= 0} {
if {[regexp -- $opts(-re) $line]} {
puts $cho $line
}
}
# Signal that the file after processing should be used both
# for comparison and for displaying.
return 1
}