50 lines
1.7 KiB
Awk
50 lines
1.7 KiB
Awk
BEGIN {
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# ppd file keys are separated from their values by a colon,
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# but "options" may reside between the key name and the colon;
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# options are separated from the key by spaces
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# (we also permit tabs to be on the safe side)
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FS = "[: \t]";
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# escape regex characters in the old and new command strings
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gsub(/[]\\.^$(){}|*+?[]/, "\\\\&", old);
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gsub(/\\/, "\\\\&", new);
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# ...and surround old command with some regex
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# that singles out shell command invocations
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# to avoid replacing other strings that might contain the
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# command name by accident (like "perl" in "perl-script")
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new = "\\1" new "\\2";
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old = "(^|[;&| \\t\"`(])" old "($|[);&| \\t\"`<>])";
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# note that a similar regex is build in the shell script to
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# filter out unaffected files before this awk script is called;
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# if the regex here is changed, the shell script should also be checked
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# list of PPD keys that contain executable names or scripts, see
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# https://refspecs.linuxfoundation.org/LSB_4.0.0/LSB-Printing/LSB-Printing/ppdext.html
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# https://www.cups.org/doc/spec-ppd.html
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cmds["*APAutoSetupTool"] = "";
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cmds["*APPrinterLowInkTool"] = "";
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cmds["*FoomaticRIPCommandLine"] = "";
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cmds["*FoomaticRIPPostPipe"] = "";
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cmds["*cupsFilter"] = "";
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cmds["*cupsFilter2"] = "";
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cmds["*cupsPreFilter"] = "";
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}
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# since comments always start with "*%",
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# this mechanism also properly recognizes (and ignores) them
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{
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# if the current line starts a new key,
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# check if it is a command-containing key;
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# also reset the `isCmd` flag if a new file begins
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if ($0 ~ /^\*/ || FNR == 1) { isCmd = ($1 in cmds) }
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# replace commands if the current keys might contain commands
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if (isCmd) { $0 = gensub(old, new, "g") }
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print
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}
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