Extract option parsing to separate file

1 files changed, 104 insertions, 0 deletions

diff --git a/src/options.c b/src/options.c
new file mode 100644
index 0000000..3150ead
--- /dev/null
+++ b/src/options.c
@@ -0,0 +1,104 @@
+#include <getopt.h>
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "options.h"
+
+static const char *usage_str =
+    ""
+    "Usage: fzy [OPTION]...\n"
+    " -l, --lines=LINES        Specify how many lines of results to show (default 10)\n"
+    " -p, --prompt=PROMPT      Input prompt (default '> ')\n"
+    " -q, --query=QUERY        Use QUERY as the initial search string\n"
+    " -e, --show-matches=QUERY Output the sorted matches of QUERY\n"
+    " -t, --tty=TTY            Specify file to use as TTY device (default /dev/tty)\n"
+    " -s, --show-scores        Show the scores of each match\n"
+    " -h, --help     Display this help and exit\n"
+    " -v, --version  Output version information and exit\n";
+
+static void usage(const char *argv0) {
+	fprintf(stderr, usage_str, argv0);
+}
+
+static struct option longopts[] = {{"show-matches", required_argument, NULL, 'e'},
+				   {"query", required_argument, NULL, 'q'},
+				   {"lines", required_argument, NULL, 'l'},
+				   {"tty", required_argument, NULL, 't'},
+				   {"prompt", required_argument, NULL, 'p'},
+				   {"show-scores", no_argument, NULL, 's'},
+				   {"version", no_argument, NULL, 'v'},
+				   {"benchmark", optional_argument, NULL, 'b'},
+				   {"help", no_argument, NULL, 'h'},
+				   {NULL, 0, NULL, 0}};
+
+void options_set_defaults(options_t *options) {
+	/* set defaults */
+	options->benchmark = 0;
+	options->filter = NULL;
+	options->init_search = NULL;
+	options->tty_filename = "/dev/tty";
+	options->show_scores = 0;
+	options->num_lines = 10;
+	options->scrolloff = 1;
+	options->prompt = "> ";
+}
+
+void options_parse(options_t *options, int argc, char *argv[]) {
+	options_set_defaults(options);
+
+	char c;
+	while ((c = getopt_long(argc, argv, "vhse:q:l:t:p:", longopts, NULL)) != -1) {
+		switch (c) {
+			case 'v':
+				printf("%s " VERSION " (c) 2014 John Hawthorn\n", argv[0]);
+				exit(EXIT_SUCCESS);
+			case 's':
+				options->show_scores = 1;
+				break;
+			case 'q':
+				options->init_search = optarg;
+				break;
+			case 'e':
+				options->filter = optarg;
+				break;
+			case 'b':
+				if (optarg) {
+					if (sscanf(optarg, "%d", &options->benchmark) != 1) {
+						usage(argv[0]);
+						exit(EXIT_FAILURE);
+					}
+				} else {
+					options->benchmark = 100;
+				}
+				break;
+			case 't':
+				options->tty_filename = optarg;
+				break;
+			case 'p':
+				options->prompt = optarg;
+				break;
+			case 'l': {
+				int l;
+				if (!strcmp(optarg, "max")) {
+					l = INT_MAX;
+				} else if (sscanf(optarg, "%d", &l) != 1 || l < 3) {
+					fprintf(stderr, "Invalid format for --lines: %s\n", optarg);
+					fprintf(stderr, "Must be integer in range 3..\n");
+					usage(argv[0]);
+					exit(EXIT_FAILURE);
+				}
+				options->num_lines = l;
+			} break;
+			case 'h':
+			default:
+				usage(argv[0]);
+				exit(EXIT_SUCCESS);
+		}
+	}
+	if (optind != argc) {
+		usage(argv[0]);
+		exit(EXIT_FAILURE);
+	}
+}