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#!/usr/bin/env tclsh
## -*- tcl -*-
# Cut and reorder fields in a CSV file.
package require csv
package require cmdline
# ----------------------------------------------------
# csvcut ?-sep sepchar? LIST file...
#
# Argument processing and checks.
set sepChar ,
set usage "Usage: $argv0 ?-sep sepchar? LIST file...\n\tLIST=idx,...\n\tidx in \{n, -m, n-, n-m\}"
while {[set ok [cmdline::getopt argv {sep.arg} opt val]] > 0} {
#puts stderr "= $opt $val"
switch -exact -- $opt {
sep {set sepChar $val}
}
}
if {($ok < 0) || ([llength $argv] < 2)} {
#puts stderr "A >>$ok<< >>[llength $argv]<<"
puts stderr $usage
exit -1
}
set indices [split [lindex $argv 0] ,]
set files [lrange $argv 1 end]
if {[llength $indices] == 0} {
#puts stderr >>$indices<<
#puts stderr B
puts stderr $usage
exit -1
}
set idx [list]
foreach i $indices {
if {[regexp -- {[0-9]+-[0-9]+} $i]} {
foreach {f t} [split $i -] break
lappend idx [list $f $t]
} elseif {[regexp -- {[0-9]+-} $i]} {
foreach {f t} [split $i -] break
lappend idx [list $f end]
} elseif {[regexp -- {-[0-9]+} $i]} {
foreach {f t} [split $i -] break
lappend idx [list 0 $t]
} elseif {[regexp -- {[0-9]+} $i]} {
lappend idx [list $i $i]
} else {
#puts stderr >>$idx<<
#puts stderr C
puts stderr $usage
exit -1
}
}
set indices $idx
if {[llength $files] == 0} {
set files -
}
# ----------------------------------------------------
# Actual processing, uses the following information from the
# commandline:
#
# files - name of the files to read
# indices - preprocessed indices
# sepChar - separator character
set stdin 1
foreach f $files {
if {![string compare $f -]} {
if {!$stdin} {
puts stderr "Cannot use - (stdin) more than once"
exit -1
}
set in stdin
set stdin 0
} else {
set in [open $f r]
}
while {![eof $in]} {
if {[gets $in line] < 0} {
continue
}
set data [::csv::split $line $sepChar]
set dataOut [list]
foreach i $indices {
foreach {f t} $i break
eval lappend dataOut [lrange $data $f $t]
}
puts stdout [::csv::join $dataOut $sepChar]
}
if {[string compare $f -]} {
close $in
}
}
exit
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