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#!/usr/bin/env slsh
% This is a simple-minded implementation of a highlighting grep program
% designed to test the pcre module.
import ("pcre");
static define usage ()
{
()=fprintf(stderr, "Usage: %s [-inl] pattern [files...]\n", __argv[0]);
exit (1);
}
static variable MATCH = 1;
static variable LINENUM = 2;
static variable FILENAME = 4;
static variable Output_Format = 0;
static 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 (pcre_exec (p, str, 0))
{
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 = pcre_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 (pcre_exec (p, str, 0));
() = fprintf (stdout, "%s", str);
}
}
}
static define main (argc, argv)
{
variable i;
variable files, pattern;
variable options;
i = 1;
files = NULL;
pattern = NULL;
options = 0;
Output_Format = MATCH;
while (i < argc)
{
variable arg = __argv[i];
i++;
if (arg[0] == '-')
{
foreach (arg[[1:]])
{
variable ch = ();
switch (ch)
{
case 'i':
options |= PCRE_CASELESS;
}
{
case 'l':
Output_Format &= ~MATCH;
Output_Format |= FILENAME;
}
{
case 'n':
Output_Format |= LINENUM;
}
{
() = fprintf (stderr, "Unsupported option: '%c'\n", ch);
exit (1);
}
}
continue;
}
pattern = arg;
break;
}
if (pattern == NULL)
usage ();
variable p = pcre_compile (pattern, options);
if (i == __argc)
{
if (isatty (stdin))
usage ();
Output_Format &= ~FILENAME;
grep (NULL, p);
return;
}
files = argv[[i:]];
if (length(files) > 1)
Output_Format |= FILENAME;
foreach (files)
{
variable f = ();
grep (f, p);
}
}
public define slsh_main ()
{
main (__argc, __argv);
exit (0);
}
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