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#!/usr/bin/env slsh
% This is a simple-minded implementation of a highlighting grep program
% designed to test the onig module.
require ("onig");
require ("cmdopt");
private define usage ()
{
()=fprintf(stderr, "Usage: %s [-inl] [--syntax syntax] pattern [files...]\n", __argv[0]);
exit (1);
}
private variable MATCH = 1;
private variable LINENUM = 2;
private variable FILENAME = 4;
private variable Output_Format = 0;
private define grep (file, p)
{
variable fp;
if (file == NULL)
fp = stdin;
else
fp = fopen (file, "r");
if (fp == NULL)
{
fprintf (stderr, "*** Unable to open %s\n", file);
return;
}
variable linenum = 0;
foreach (fp) using ("line")
{
variable str = ();
linenum++;
if (onig_search (p, str))
{
variable i0, i1, i;
switch (Output_Format)
{
case FILENAME:
() = fprintf (stdout, "%s\n", file);
return;
}
{
case LINENUM:
() = fprintf (stdout, "%d\n", linenum);
continue;
}
{
case (MATCH|LINENUM):
() = fprintf (stdout, "%d:", linenum);
}
{
case (LINENUM|FILENAME):
() = fprintf (stdout, "%s:%d\n", file, linenum);
continue;
}
{
case (LINENUM|FILENAME|MATCH):
() = fprintf (stdout, "%s:%d:", file, linenum);
}
{
case (FILENAME|MATCH):
() = fprintf (stdout, "%s:", file);
}
do
{
i = onig_nth_match (p, 0);
i0 = i[0];
i1 = i[1];
if (i1 <= i0)
break;
if (i0 > 0)
() = fprintf (stdout, "%s", str[[0:i0-1]]);
() = fprintf (stdout, "\e[7m%s\e[m", str[[i0:i1-1]]);
str = str[[i1:]];
}
while (onig_search (p, str));
() = fprintf (stdout, "%s", str);
}
}
}
define slsh_main ()
{
variable options;
options = 0;
Output_Format = MATCH;
variable syntax = "perl";
variable opts = cmdopt_new ();
opts.add ("i", &options; bor=ONIG_OPTION_IGNORECASE);
opts.add ("n", &Output_Format; bor=LINENUM);
opts.add ("l", &Output_Format; bor=FILENAME, band=~MATCH);
opts.add ("h|help", &usage);
opts.add ("s|syntax", &syntax);
variable i = opts.process (__argv, 1);
if (i + 1 > __argc)
usage ();
variable pattern = __argv[i];
i++;
variable reg = onig_new (pattern, options, "utf8", syntax);
if (i == __argc)
{
if (isatty (stdin))
usage ();
Output_Format &= ~FILENAME;
grep (NULL, reg);
return;
}
variable files = __argv[[i:]];
if (length(files) > 1)
Output_Format |= FILENAME;
foreach (files)
{
variable f = ();
grep (f, reg);
}
}
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