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############################################################################
#
# File: trim.icn
#
# Subject: Program to trim lines in a file
#
# Author: Ralph E. Griswold
#
# Date: December 26, 1998
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# This program copies lines from standard input to standard out-
# put, truncating the lines at n characters and removing any trail-
# ing blanks and tabs. The default value for n is 80. For example,
#
# trim 70 <grade.txt >grade.fix
#
# copies grade.txt to grade.fix, with lines longer than 70 charac-
# ters truncated to 70 characters and the trailing blanks removed
# from all lines.
#
# The -f option causes all lines to be n characters long by
# adding blanks to short lines; otherwise, short lines are left as
# is.
#
############################################################################
#
# Links: options
#
############################################################################
link options
procedure main(args)
local n, pad, line, opts
opts := options(args,"f")
if \opts["f"] then pad := 1 else pad := 0
n := (0 <= integer(args[1])) | 80
while line := read() do {
line := line[1+:n]
line := trim(line, ' \t')
if pad = 1 then line := left(line,n)
write(line)
}
end
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