Colored grep?

Here is a snippet for a log coloring tool I sometimes use.

Note that is only works against stdin/stdout and in a terminal supporting ANSI colors.

#include <stdio.h>#include <regex.h>#define MAX_LINE 4096#define RESET   "\033[0m"#define BLACK   "\033[30m"      /* Black */#define RED     "\033[31m"      /* Red */#define GREEN   "\033[32m"      /* Green */#define YELLOW  "\033[33m"      /* Yellow */#define BLUE    "\033[34m"      /* Blue */#define MAGENTA "\033[35m"      /* Magenta */#define CYAN    "\033[36m"      /* Cyan */#define WHITE   "\033[37m"      /* White */#define BOLDBLACK   "\033[1m\033[30m"      /* Bold Black */#define BOLDRED     "\033[1m\033[31m"      /* Bold Red */#define BOLDGREEN   "\033[1m\033[32m"      /* Bold Green */#define BOLDYELLOW  "\033[1m\033[33m"      /* Bold Yellow */#define BOLDBLUE    "\033[1m\033[34m"      /* Bold Blue */#define BOLDMAGENTA "\033[1m\033[35m"      /* Bold Magenta */#define BOLDCYAN    "\033[1m\033[36m"      /* Bold Cyan */#define BOLDWHITE   "\033[1m\033[37m"      /* Bold White */static int selected_color = 0;static char *colors[] = {  "-green", GREEN,  "-black", BLACK,  "-red", RED,  "-yellow", YELLOW,  "-blue", BLUE,  "-magenta", MAGENTA,  "-cyan", CYAN,  "-white", WHITE,  "-boldgreen", BOLDGREEN,  "-boldblack", BOLDBLACK,  "-boldred", BOLDRED,  "-boldyellow", BOLDYELLOW,  "-boldblue", BOLDBLUE,  "-boldmagenta", BOLDMAGENTA,  "-boldcyan", BOLDCYAN,  "-boldwhite", BOLDWHITE,  NULL};/*----------------------------------------------------------------------*/int main(int argc, char *argv[]) {  char buf[MAX_LINE];  int has_re = 0;  regex_t re;  if (argc > 1) {    if (argc > 2) {      int idx = 0;      while (colors[idx*2]) {        if (!strcmp(colors[idx*2], argv[1])) {          selected_color = idx;          break;        }        idx++;      }      if (regcomp(&re, argv[2], REG_EXTENDED | REG_NEWLINE)) {        printf("regcomp() failed!\n");        return -1;      }    } else if (regcomp(&re, argv[1], REG_EXTENDED | REG_NEWLINE)) {      printf("regcomp() failed!\n");      return -1;    }    has_re = 1;  } else {    printf("Usage: %s [ -red | -blue | -cyan | -white | -black | "           "-yellow | -magenta ] <regexp>\n", argv[0]);    return -1;    }  while (fgets(buf, MAX_LINE, stdin) == buf) {    char *bbuf = buf;    while (1) {      if (has_re) {        regmatch_t match[10];        if (regexec(&re, bbuf, re.re_nsub + 1, match, 0)) {          printf("%s", bbuf);          break;        } else {          int i, idx;          for (i=idx=0; i<1; i++) {            if (match[0].rm_so < 0) {              break;            } else {              printf("%.*s",                      (int)(match[i].rm_so-idx),                      bbuf+idx);              printf( "%s%.*s" RESET,                       colors[selected_color*2+1],                      (int)(match[i].rm_eo-match[i].rm_so),                       bbuf+(int)match[i].rm_so);              idx = match[i].rm_eo;              bbuf += idx;            }          }        }      }      fflush(stdout);    }  }  if (has_re) {    regfree(&re);  }  return 0;}

For searching source code, I use ack. It's got a lot of options that make sense for searching code (such as automatically ignoring SCM directories).

There are many programs that support coloring like Colortail

Maybe this can be helpful too: GenericColouriser