From 47cf241b4b03d728e8e4155418b09fdb5fe553b5 Mon Sep 17 00:00:00 2001
From: Gustav Behm <me@rootmos.io>
Date: Fri, 29 Mar 2024 04:42:01 +0100
Subject: [PATCH] Parse options

---
 c-impl/action.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)

diff --git a/c-impl/action.c b/c-impl/action.c
index 49e0ea8..b29fe21 100644
--- a/c-impl/action.c
+++ b/c-impl/action.c
@@ -5,6 +5,62 @@
 #define LIBR_IMPLEMENTATION
 #include "r.h"
 
+struct options {
+    const char* action;
+
+    enum {
+        NOOP = 0,
+        BIND,
+        TRIGGER,
+    } cmd;
+};
+
+static void print_usage(int fd, const char* prog)
+{
+    dprintf(fd, "usage: %s [OPTION]... ACTION\n", prog);
+    dprintf(fd, "\n");
+    dprintf(fd, "commands:\n");
+    dprintf(fd, "  -b       bind action\n");
+    dprintf(fd, "  -t       trigger action\n");
+    dprintf(fd, "  -h       print this message\n");
+}
+
+static void parse_options(struct options* o, int argc, char* argv[])
+{
+    memset(o, 0, sizeof(*o));
+
+    int res;
+    while((res = getopt(argc, argv, "bth")) != -1) {
+        switch(res) {
+        case 't': o->cmd = TRIGGER; break;
+        case 'b': o->cmd = BIND; break;
+        case 'h':
+        default:
+            print_usage(res == 'h' ? 1 : 2, argv[0]);
+            exit(res == 'h' ? 0 : 2);
+        }
+    }
+
+    if(optind + 1 == argc) {
+        o->action = argv[optind];
+        debug("action: %s", o->action);
+    } else {
+        if(optind >= argc) {
+            dprintf(2, "error: action not specified\n");
+        } else {
+            dprintf(2, "error: too many actions specified\n");
+        }
+        print_usage(2, argv[0]);
+        exit(2);
+    }
+
+    if(o->cmd == NOOP) {
+        dprintf(2, "error: command not specified\n");
+        print_usage(2, argv[0]);
+        exit(2);
+    }
+}
+
 struct state {
     int running;
 
@@ -69,6 +125,9 @@ static void signalfd_handle_event(struct state* st)
 
 int main(int argc, char* argv[])
 {
+    struct options o;
+    parse_options(&o, argc, argv);
+
     struct state st = {
         .running = 1,
     };
-- 
2.45.2