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#!/usr/bin/env tclsh
## -*- tcl -*-
# Sort CSV data by a column
package require csv
package require cmdline
# ----------------------------------------------------
# csvsort ?-sep sepchar? ?-f? ?-n? ?-r? ?-skip cnt? column file.in|- file.out|-
#
# Argument processing and checks.
set sepChar ,
set sortmode ascii
set order increasing
set reverse 0
set skip 0
set usage "Usage: $argv0 ?-sep sepchar? ?-f? ?-n? ?-r? ?-skip cnt? column file.in|- file.out|-"
while {[set ok [cmdline::getopt argv {sep.arg f n r skip.arg} opt val]] > 0} {
#puts stderr "= $opt $val"
switch -exact -- $opt {
sep {set sepChar $val}
n {set sortmode integer}
f {set sortmode real}
r {set order decreasing}
skip {set skip $val}
}
}
if {($ok < 0) || ([llength $argv] != 3)} {
puts stderr $usage
exit -1
}
foreach {sortCol in out} $argv break
if {
![string is integer $sortCol] ||
($sortCol < 0) ||
![string compare $in ""] ||
![string compare $out ""]
} {
puts stderr $usage
exit -1
}
if {![string compare $in -]} {
set in stdin
} else {
set in [open $in r]
}
if {![string compare $out -]} {
set out stdout
} else {
set out [open $out w]
}
# ----------------------------------------------------
# Actual processing, uses the following information from the
# commandline:
#
# in - channel for input
# out - channel for output
# sepChar - separator character
# sortCol - column to sort after
# sortmode - Sort integer (1) or string (0)
# reverse - Sort ascending (0) or descending (1)
# skip - Skip that many lines at the beginning.
set data [list]
while {![eof $in]} {
if {[gets $in line] < 0} {
continue
}
if {$skip > 0} {
puts $out $line
incr skip -1
continue
}
lappend data [::csv::split $line $sepChar]
}
#puts stderr $sortmode,$order
set data [lsort -index $sortCol -$order -$sortmode $data]
foreach item $data {
puts $out [::csv::join $item $sepChar]
}
exit ; # automatically closes the channels
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