[WIP] Switch option parsing to getopt_long

options.c

@@ -0,0 +1,126 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <getopt.h>
+
+typedef struct {
+	const char *long_name;
+	char short_name;
+	int args;
+	const *char args_help;
+	const *char opt_help;
+} Option;
+
+#define help_section(title) {NULL, 0, 0, NULL, title}
+#define help_empty_line {NULL, 0, 0, NULL, ""}
+
+static Option options[] = {
+	help_section(									"Generic Options:"),
+	{"root",		0,		0,	NULL,					"Treat multiple displays as one big screen (ignore xrandr outputs)"},
+	{"screens",		0,		1,	"<int>",				"Set a screenmask to use"},
+	help_empty_line,
+	help_section(									"Gradients:"),
+	{"add",			0,		1,	"<color>",				"Add color to range using distance 1"},
+	{"addd",		0,		2,	"<color> <distance>",	"Add color to range using custom distance"},
+	{"gradient",	0,		1,	"<angle>",				"Render gradient using specified angle"},
+	{"clear",		0,		0,	NULL,					"Clear the color range"},
+	help_empty_line,
+	help_section(									"Solid:"),
+	{"solid",		0,		1,	"<color>",				"Render a solid using the specified color"},
+	help_empty_line,
+	help_section(									"Image files:"),
+	{"center",		0,		1,	"<image>",				"Render an image centered on screen"},
+	{"cover",		0,		1,	"<image>",				"Render an image centered on screen scaled to fill the screen fully"},
+	{"tile",		0,		1,	"<image>",				"Render an image tiled"},
+	{"full",		0,		1,	"<image>",				"Render an image maximum aspect"},
+	{"extend",		0,		1,	"<image>",				"Render an image max aspect and fill borders"},
+	{"fill",		0,		1,	"<image>",				"Render an image stretched"},
+	help_empty_line,
+	help_section(									"Manipulations:"),
+	{"tint",		0,		1,	"<color>",				"Tint the current image"},
+	{"blur",		0,		1,	"<radius>",				"Blur the current image"},
+	{"sharpen",		0,		1,	"<radius>",				"Sharpen the current image"},
+	{"contrast",	0,		1,	"<amount>",				"Adjust contrast of current image"},
+	{"brightness",	0,		1,	"<amount>",				"Adjust brightness of current image"},
+	{"gamma",		0,		1,	"<amount>",				"Adjust gamma level of current image"},
+	{"flipv",		0,		0,	NULL,					"Flip the current image vertically"},
+	{"fliph",		0,		0,	NULL,					"Flip the current image horizontally"},
+	{"flipd",		0,		0,	NULL,					"Flip the current image diagonally"},
+	help_empty_line,
+	help_section(									"Misc:"),
+	{"alpha",		0,		1,	"<amount>",				"Adjust alpha level for colors and images"},
+	{"write",		0,		1,	"<filename>",			"Write current image to file"},
+	{"help",		'h',	0,	NULL,					"This help"},
+	{"version",		'V',	0,	NULL,					"Version"},
+};
+
+#undef help_empty_line
+#undef help_section
+
+int
+main(int argc, char **argv)
+{
+	while (1) {
+		int option_index = 0;
+		static struct option long_options[] = {
+			{"add",     required_argument, 0, 0},
+			{"append",  no_argument,       0, 0},
+			{"delete",  required_argument, 0, 0},
+			{"verbose", no_argument,       0, 0},
+			{"create",  required_argument, 0, 'c'},
+			{"file",    required_argument, 0, 0},
+			{0,         0,                 0, 0},
+		};
+
+		int c = getopt_long(argc, argv, "abc:d:012", long_options, &option_index);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 0:
+			printf("option %s", long_options[option_index].name);
+			if (optarg)
+				printf(" with arg %s", optarg);
+			printf("\n");
+			break;
+
+		case '0':
+		case '1':
+		case '2':
+			printf("option %c\n", c);
+			break;
+
+		case 'a':
+			printf("option a\n");
+			break;
+
+		case 'b':
+			printf("option b\n");
+			break;
+
+		case 'c':
+			// 2 arguments
+			printf("option c with value '%s'; next %s\n", optarg, argv[optind]);
+			optind++;
+			break;
+
+		case 'd':
+			printf("option d with value '%s'\n", optarg);
+			break;
+
+		case '?':
+			break;
+
+		default:
+			printf("?? getopt returned character code 0%o ??\n", c);
+		}
+	}
+
+	if (optind < argc) {
+		printf("non-option ARGV-elements: ");
+		while (optind < argc)
+			printf("%s ", argv[optind++]);
+		printf("\n");
+	}
+
+	return 0;
+}