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############################################################################
#
# File: spread.icn
#
# Subject: Program to format tab-separated data columns
#
# Author: Gregg M. Townsend
#
# Date: June 6, 1999
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# Spread reads data presented in tab-separated fields, such
# as some some spreadsheets export, and outputs the data in
# space-separated columns of the minimum necessary width.
#
# Usage: spread [-t c] [-g n] [-r] [file...]
#
# -g n set gutter width between output columns (default is 1)
# -r right-justify the fields instead of left-justifying
# -t c set separator character(s) for data (default is \t)
#
############################################################################
#
# Links: options
#
############################################################################
link options
procedure main(args)
local opts, sep, gutter, justify, fname, f
local data, colsz, s, n, i, t
# process options and set defaults
opts := options(args, "g+t:r") # command options
sep := cset(\opts["t"]) | '\t' # separator cset
gutter := integer(\opts["g"]) | 1 # output gutter width
justify := if \opts["r"] then right else left # justifying procedure
# load data into memory
data := []
if *args = 0 then
while put(data, read())
else {
every fname := !args do {
f := open(fname) | stop("can't open ", fname)
while put(data, read(f))
}
}
# scan data to record maximum column widths needed
colsz := []
every s := !data do s ? {
i := 0
while n := (*tab(upto(sep)) | (0 < *tab(0))) do {
move(1)
i +:= 1
if n <= colsz[i] then
next
if i > *colsz then
put(colsz, n)
else
colsz[i] := n
}
}
# adjust column sizes to allow for gutters
every !colsz +:= gutter
if justify === right then
colsz[1] -:= gutter
# write padded output
every s := !data do s ? {
i := 0
while t := tab(upto(sep)) do {
writes(justify(t, colsz[i +:= 1]))
move(1)
}
write(justify(tab(0), colsz[i +:= 1]))
}
end
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