34 lines
837 B
Nim
34 lines
837 B
Nim
import cligen, os, streams
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import common
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proc catFile(file:string) =
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if not existsFile(file):
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err "tac: " & file & ": No such file or directory"
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system.quit 1
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var
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f = open(file, fmRead)
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reverseLines: seq[string]
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for line in lines(f):
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reverseLines = line & reverseLines
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for line in reverseLines:
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writeLine(stdout, line)
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proc catStdin() =
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var
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line = ""
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reverseLines: seq[string]
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while stdin.readLine(line):
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reverseLines = line & reverseLines
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for line in reverseLines:
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writeLine(stdout, line)
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proc main(files:seq[string]) =
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if files.len == 0:
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catStdin()
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for file in files:
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if file == "-":
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catStdin()
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else:
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catFile(file)
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dispatch(main, version=("version", nimbaseVersion))
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