File: files

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epic5 2.0.1-1
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if (word(2 $loadinfo()) != [pf]) { load -pf $word(1 $loadinfo()); return; };

: {
/*
 * FILES script -- complements the new file functions.
 * Written by Jeremy Nelson -- EPIC project
 *
 * These aliases are not anywhere near as fast as /exec'ing the
 * c programs, but they are here to illustrate the usage of the fns.
 */
}

# dump a file out to the screen w/o using /exec 
alias cat {
	@ fd = open($0 R);
	while (!eof($fd)) { echo $read($fd) };
	@ close($fd);
};

# Search for a string in a group of files 
# This is, of course, case insensitive 
alias grep {
	for x in ($1-) {
		@ fd = open($x R);
		while (!eof($fd)) { 
			@ line = read($fd);
			if (match(*$0* $line))
				{echo $x: $line};
		};
		@close($fd);
	};
};

: {/* Write a line to a file w/o using the logging features */}
alias log_it {
	@ fd = open($0 W);
	@ write($fd $1-);
	@ close($fd);
};

# 
# Call as /exclude filename pattern
#
alias exclude { 
        @ :reg = regcomp($1-);
        @ :rd = open($0 R);
        @ :wd = open($0.new W);
        
	@ line = read($rd);
	do
        {       
                if (regexec($reg $line)) {
                        @ write($wd $line);
                };
		@ line = read($rd);
        } while (!eof($rd));

        @ close($rd);
        @ close($wd);
        @ regfree($reg);

        @ unlink($0);
        @ rename($0.new $0);
};

#
# This is exactly the same as $randread() except that
# $randread() seeks to a random _point_ in the file
# whereas this seeks to a random _line_.
#
# Also, you can specify any number of files/globs and
# it will return one line from every file.
#
alias randomread {
	@ :ret = glob($*);
	fe ret ret {
		@ :fd = open("$ret" r);
		@ :line = 2 ** 30;
		@ :line = fskip($fd $line);
		@ :line = rand($line);
		@ fseek($fd 0 set);
		@ fskip($fd $line);
		@ :ret = read($fd);
		@ close($fd);
	};
	if (functioncall()) {
		return $ret;
	} else {
		echo $ret;
	};
};