From e3bdb80e91fd1aea2e36945f09fb3bcc534c5404 Mon Sep 17 00:00:00 2001
From: jacekpoz <jacekpoz@cock.li>
Date: Mon, 12 Feb 2024 00:49:52 +0100
Subject: [PATCH] initial mod subcommands work

---
 src/main.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 52 insertions(+), 1 deletion(-)

diff --git a/src/main.c b/src/main.c
index 23f5ed7..a46fcaf 100644
--- a/src/main.c
+++ b/src/main.c
@@ -4,6 +4,7 @@
 #include <semver.h>
 #include <util.h>
 
+#include <dlfcn.h>
 #include <errno.h>
 #include <stdbool.h>
 #include <stdint.h>
@@ -21,6 +22,14 @@ static const semver VERSION = {
     .patch = 0,
 };
 
+void print_mod_help(FILE *stream) {
+    fprintf(stream, "%s mod: module information\n", PNAME);
+    fprintf(stream, "\n");
+    fprintf(stream, "SUBCOMMANDS\n");
+    fprintf(stream, "\tlist\t\t\t\tlists all available modules\n");
+    fprintf(stream, "\tinfo <module>\t\t\tprints all info about module\n");
+}
+
 int main(int argc, char *argv[]) {
 
     char *config_path = default_config_path();
@@ -37,8 +46,11 @@ int main(int argc, char *argv[]) {
     fclose(config_file);
     free(config_path);
 
+    bool hit_mod_cmd = false;
+
     for (size_t i = 1; i < (size_t)argc; ++i) {
         if (strcmp(argv[i], "-c") == 0 || strcmp(argv[i], "--config") == 0) {
+            // no more args
             if (i == (size_t)argc - 1) {
                 fprintf(stderr, "error: no config path passed\n");
                 exit(EXIT_FAILURE);
@@ -52,9 +64,48 @@ int main(int argc, char *argv[]) {
         if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
             printf("%s: modular fetch [%s]\n", PNAME, svtoa(VERSION));
             printf("\n");
+            printf("SUBCOMMANDS\n");
+            printf("\tmod\t\t\t\tmodule information\n");
+            printf("\n");
             printf("OPTIONS\n");
             printf("\t-h, --help\t\t\tdisplays this help text\n");
-            printf("\t-c, --config /path/to/config\tchanges config path from the default ($XDG_CONFIG_HOME/%s.conf)\n", PNAME);
+            printf("\t-c, --config </path/to/config>\tchanges config path from the default ($XDG_CONFIG_HOME/%s.conf)\n", PNAME);
+            exit(EXIT_SUCCESS);
+        }
+
+        if (strncmp(argv[i], "mod", 3) == 0 || hit_mod_cmd) {
+            // no more args 
+            if (i == (size_t)argc - 1) {
+                print_mod_help(stderr);
+                exit(EXIT_FAILURE);
+            }
+            
+            i += 1;
+
+            if (strcmp(argv[i], "-h") == 0 || strcmp(argv[i], "--help") == 0) {
+                print_mod_help(stdout);
+                exit(EXIT_SUCCESS);
+            }
+
+            // some other -/-- option in between the mod and the specific mod command
+            if (argv[i][0] == '-') {
+                hit_mod_cmd = true;
+                continue;
+            }
+
+            if (strcmp(argv[i], "list") == 0) {
+                for (size_t ii = 0; ii < config.module_count; ++ii) {
+                    Module current_module = config.modules[ii];
+                    void *handle = dlopen(current_module.path, RTLD_NOW);
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wpedantic"
+                    semver (*mod_version)(void) = dlsym(handle, "version");
+                    const char *(*mod_name)(void) = dlsym(handle, "name");
+#pragma GCC diagnostic pop
+                    printf("%s-%s\n", mod_name(), svtoa(mod_version()));
+                }
+            }
+
             exit(EXIT_SUCCESS);
         }
     }