Fixed --help, also added some randomness.

1 files changed, 70 insertions, 18 deletions

diff --git a/lolcat.c b/lolcat.c
index caf83df..87eaeb9 100644
--- a/lolcat.c
+++ b/lolcat.c
@@ -13,6 +13,9 @@
  * 0. You just DO WHAT THE FUCK YOU WANT TO.
  */
 
+#define _GNU_SOURCE //for fmemopen
+
+#include <stdint.h>
 #include <stdio.h>
 #include <wchar.h>
 #include <ctype.h>
@@ -21,9 +24,35 @@
 #include <stdlib.h>
 #include <string.h>
 #include <locale.h>
+#include <unistd.h>
+#include <sys/time.h>
+
+#include "fgetwc_fix.h"
+
+
+static char helpstr[] = "\n"
+"Usage: lolcat [-h horizontal_speed] [-v vertical_speed] [--] [FILES...]\n"
+"\n"
+"Concatenate FILE(s), or standard input, to standard output.\n"
+"With no FILE, or when FILE is -, read standard input.\n"
+"\n"
+"              -h <d>:   Horizontal rainbow frequency (default: 0.23)\n"
+"              -v <d>:   Vertical rainbow frequency (default: 0.1)\n"
+"                  -f:   Force color even when stdout is not a tty\n"
+"           --version:   Print version and exit\n"
+"              --help:   Show this message\n"
+"\n"
+"Examples:\n"
+"  lolcat f - g      Output f's contents, then stdin, then g's contents.\n"
+"  lolcat            Copy standard input to standard output.\n"
+"  fortune | lolcat  Display a rainbow cookie.\n"
+"\n"
+"Report lolcat bugs to <http://www.github.org/jaseg/lolcat/issues>\n"
+"lolcat home page: <http://www.github.org/jaseg/lolcat/>\n"
+"Original idea: <http://www.github.org/busyloop/lolcat/>\n";
 
 #define ARRAY_SIZE(foo) (sizeof(foo)/sizeof(foo[0]))
-char codes[] = {39,38,44,43,49,48,84,83,119,118,154,148,184,178,214,208,209,203,204,198,199,163,164,128,129,93,99,63,69,33};
+const char codes[] = {39,38,44,43,49,48,84,83,119,118,154,148,184,178,214,208,209,203,204,198,199,163,164,128,129,93,99,63,69,33};
 
 /* CAUTION! this function uses a function-static variable! */
 void find_escape_sequences(int c, int *state){
@@ -43,10 +72,20 @@ void usage(){
 	exit(1);
 }
 
+void version(){
+	printf("lolcat version 0.1, (c) 2014 jaseg\n");
+	exit(0);
+}
+
 int main(int argc, char **argv){
 	int c, cc=-1, i, l=0;
+	int colors=(isatty(1) == 1);
 	double freq_h = 0.23, freq_v = 0.1;
 
+	struct timeval tv;
+	gettimeofday(&tv, NULL);
+	double offx = (tv.tv_sec%300)/300.0;
+
 	for(i=1;i<argc;i++){
 		char *endptr;
 		if(!strcmp(argv[i], "-h")){
@@ -65,6 +104,10 @@ int main(int argc, char **argv){
 			}else{
 				usage();
 			}
+		}else if(!strcmp(argv[i], "-f")){
+			colors = 1;
+		}else if(!strcmp(argv[i], "--version")){
+			version();
 		}else{
 			if(!strcmp(argv[i], "--"))
 				i++;
@@ -87,20 +130,29 @@ int main(int argc, char **argv){
 		FILE *f = stdin;
 		int escape_state = 0;
 
-		if(strcmp(*filename, "-"))
+		if(!strcmp(*filename, "--help"))
+			f = fmemopen(helpstr, strlen(helpstr), "r");
+		else if(strcmp(*filename, "-"))
 			f = fopen(*filename, "r");
-
-		while((c = fgetwc(f)) > 0){
-			find_escape_sequences(c, &escape_state);
-
-			if(!escape_state){
-				if(c == '\n'){
-					l++;
-					i = 0;
-				}else if(!iscntrl(c)){
-					int ncc = (int)((i++)*freq_h + l*freq_v);
-					if(cc != ncc)
-						printf("\033[38;5;%hhum", codes[(cc = ncc) % ARRAY_SIZE(codes)]);
+		
+		if(!f){
+			fprintf(stderr, "Cannot open input file \"%s\": %s\n", *filename, strerror(errno));
+			return 2;
+		} 
+
+		while((c = _fgetwc_fixed(f)) > 0){
+			if(colors){
+				find_escape_sequences(c, &escape_state);
+
+				if(!escape_state){
+					if(c == '\n'){
+						l++;
+						i = 0;
+					}else if(!iscntrl(c)){
+						int ncc = offx*ARRAY_SIZE(codes) + (int)((i++)*freq_h + l*freq_v);
+						if(cc != ncc)
+							printf("\033[38;5;%hhum", codes[(cc = ncc) % ARRAY_SIZE(codes)]);
+					}
 				}
 			}
 
@@ -110,11 +162,11 @@ int main(int argc, char **argv){
 				printf("\033[38;5;%hhum", codes[cc % ARRAY_SIZE(codes)]);
 		}
 
-		if(c != WEOF){
-			fprintf(stderr, "Error reading input file \"%s\": %s (%d)\n", *filename, strerror(errno), errno);
+		fclose(f);
+
+		if(c != WEOF && c != 0){
+			fprintf(stderr, "Error reading input file \"%s\": %s\n", *filename, strerror(errno));
 			return 2;
 		}
-
-		fclose(f);
 	}
 }