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#!/usr/bin/ruby
# pds - parallel data substitution (doing 80% of sed 120% as well)
USAGE = <<'EOF'
pds [-i[BAK]] [-0] [-A] [-r] [-p] [-t] [-w] [-c[CHECK]] [-n[NTH]]
PATTERN REPLACEMENT [PATTERN REPLACEMENT]... -- FILES...
replaces each PATTERN with REPLACEMENT in the input, simultaneously
-i[BAK] edit files in place (backup with suffix BAK if supplied)
-0 work on NUL terminated lines
-A work on whole file at once
-r enable regex for PATTERN and backreferences for REPLACEMENT
\& for the match, \1..\9 for n-th backreference, \c to clear line
-p only print lines with replacements
-t toggle; also replace each REPLACEMENT with PATTERN
-w PATTERN shall only match whole words
-c[CHECK] ensure there has been at least one (or CHECK) replacement per file
-n[NTH] only replace NTH match (comma-separated list of numbers) per line
EOF
require 'fcntl'
def fatal(msg)
STDERR.puts "pds: #{msg}"
exit -1
end
iflag = nil
rflag = false
nullflag = true
nflag = []
cflag = nil
allflag = false
pflag = false
tflag = false
wflag = false
replacements = []
nl = "\n"
done = false
until done
arg = ARGV.shift
case arg
when /\A-i/
iflag = $'
when "-r"
rflag = true
when "-p"
pflag = true
when "-t"
tflag = true
when "-w"
wflag = true
when "-0"
nl = "\0"
nullflag = true
when /\A-c/
cflag = $'
when "-A"
allflag = true
when /\A-n/
nflag.concat $'.split(',').map { |x| Integer(x) }
when /\A-/
fatal "invalid argument '#{arg}'\n#{USAGE}"
else
if rflag && tflag
fatal "cannot use -r and -t together"
end
loop {
if !arg || arg == "--"
done = true
break
end
from = arg
to = ARGV.shift
if !to
STDERR.puts "no replacement for '#{from}'"
exit 1
end
replacements << [from, to]
replacements << [to, from] if tflag
arg = ARGV.shift
}
end
end
if cflag
cflag = cflag.split(',').map { |x| Integer(x) }
end
if replacements.empty?
fatal "no pattern given\n#{USAGE}"
end
rx = replacements.map { |x|
begin
rflag ? Regexp.new(x[0]) : Regexp.quote(x[0])
rescue RegexpError
fatal "invalid regex: #{$!}"
end
}
if wflag
rx.map! { |x| /\b#{x}\b/ }
end
union = Regexp.union(rx)
retval = 0
ARGV << "-" if ARGV.empty?
ARGV.each { |file|
input =
if file == "-"
STDIN
else
begin
File.open(file)
rescue SystemCallError => e
fatal "can't read #{file}: #{e.to_s.sub(/ @ .*/, '')}"
end
end
output =
if iflag
begin
tmpname = "#{file}.pds.#{rand(2**32).to_s(36)}~"
File.open(tmpname, Fcntl::O_WRONLY | Fcntl::O_EXCL | Fcntl::O_CREAT)
rescue SystemCallError => e
fatal "couldn't open temporary file #{file}: #{e.to_s.sub(/ @ .*/, '')}"
end
else
STDOUT
end
reps = 0
while line = (allflag ? input.read : input.gets(nl))
newline = ""
lastpos = 0
offset = 0
nth = 0
if nullflag
# fix $ and \z behavior
line.chomp!(nl)
end
loop {
leftmost = nil
matched = nil
replace = nil
rx.each_with_index { |r, i|
if m = line.match(r, offset)
if !leftmost || m.offset(0).first < leftmost.first
leftmost = m.offset(0)
matched = m
replace = replacements[i][1]
end
end
}
if !matched
newline << line[offset..-1]
break
end
nth += 1
newline << line[offset...leftmost[0]]
if nflag.empty? || nflag.include?(nth)
reps += 1
if rflag
if replace == '\c'
newline = nil
break
end
newline << replace.gsub(/\\[1-9&]/) { |e|
if e == '\&'
matched[0]
else
matched[e[1].to_i]
end
}
else
newline << replace
end
else
newline << line[offset...leftmost[1]]
end
if offset == leftmost[1]
if offset == line.size
break
else
newline << line[offset]
offset += 1
next
end
else
offset = leftmost[1]
end
break if offset >= line.size
}
if newline
if nullflag
newline << nl
end
if !pflag || nth > 0
output.write newline
end
end
break if allflag
end
if cflag
if (cflag.empty? && reps == 0) || !(cflag.empty? && !cflag.include?(reps))
File.delete(tmpname) if iflag
output.close
retval = 1
next
end
end
if iflag
output.close
if !iflag.empty?
File.rename(file, file+iflag)
end
File.rename(tmpname, file)
end
}
exit retval
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