Refactor code to snake_style, turn renderers into plugins, and start

wayland (cairo) renderer.

1 files changed, 144 insertions, 8 deletions

diff --git a/lib/library.c b/lib/library.c
index f432eda..6544086 100644
--- a/lib/library.c
+++ b/lib/library.c
@@ -1,15 +1,151 @@
+#include "internal.h"
 #include "version.h"
 
-/**
- * Get version of the library in 'major.minor.patch' format.
- *
- * @see @link http://semver.org/ Semantic Versioning @endlink
- *
- * @return Null terminated C "string" to version string.
- */
-const char *bmVersion(void)
+#include "3rdparty/tinydir.h"
+#include "3rdparty/cdl.h"
+
+#include <unistd.h>
+#include <stdio.h>
+#include <assert.h>
+
+static struct list renderers;
+
+static void
+bm_renderer_free(struct bm_renderer *renderer)
+{
+    assert(renderer);
+
+    if (renderer->handle)
+        chckDlUnload(renderer->handle);
+
+    free(renderer->name);
+    free(renderer->file);
+    free(renderer);
+}
+
+static bool
+load(const char *file, struct bm_renderer *renderer)
+{
+    void *handle;
+    const char *error = NULL;
+
+    if (!(handle = chckDlLoad(file, &error)))
+        goto fail;
+
+    const char* (*regfun)(struct render_api*);
+    if (!(regfun = chckDlLoadSymbol(handle, "register_renderer", &error)))
+        goto fail;
+
+    renderer->file = bm_strdup(file);
+    renderer->handle = handle;
+    const char *name = regfun(&renderer->api);
+    renderer->name = (name ? bm_strdup(name) : NULL);
+    return true;
+
+fail:
+    if (handle)
+        chckDlUnload(handle);
+    fprintf(stderr, "%s\n", error);
+    return false;
+}
+
+static bool
+load_to_list(const char *file)
+{
+    struct bm_renderer *renderer;
+    if (!(renderer = calloc(1, sizeof(struct bm_renderer))))
+        goto fail;
+
+    if (!load(file, renderer))
+        goto fail;
+
+    chckDlUnload(renderer->handle);
+    return list_add_item(&renderers, renderer);
+
+fail:
+    if (renderer)
+        bm_renderer_free(renderer);
+    return false;
+}
+
+bool
+bm_renderer_activate(struct bm_renderer *renderer)
+{
+    assert(renderer);
+
+    if (!load(renderer->file, renderer))
+        return false;
+
+    return true;
+}
+
+bool
+bm_init(void)
+{
+    static const char *rpath = INSTALL_PREFIX "/lib/bemenu";
+
+    const char *path = getenv("BEMENU_RENDERER");
+
+    if (path)
+        return load_to_list(path);
+
+    path = getenv("BEMENU_RENDERERS");
+
+    if (!path || access(path, R_OK) == -1)
+        path = rpath;
+
+    tinydir_dir dir;
+    if (tinydir_open(&dir, path) == -1)
+        goto fail;
+
+    size_t registered = 0;
+    while (dir.has_next) {
+        tinydir_file file;
+        memset(&file, 0, sizeof(file));
+        tinydir_readfile(&dir, &file);
+
+        if (!file.is_dir && !strncmp(file.name, "bemenu-renderer-", strlen("bemenu-renderer-"))) {
+            size_t len = snprintf(NULL, 0, "%s/%s", file.name, path);
+
+            char *fpath;
+            if ((fpath = calloc(1, len + 1))) {
+                sprintf(fpath, "%s/%s", path, file.name);
+
+                if (load_to_list(fpath))
+                    registered++;
+
+                free(fpath);
+            }
+        }
+
+        tinydir_next(&dir);
+    }
+
+    tinydir_close(&dir);
+    return (registered > 0 ? true : false);
+
+fail:
+    return false;
+}
+
+const struct bm_renderer**
+bm_get_renderers(uint32_t *out_nmemb)
+{
+    assert(out_nmemb);
+    return list_get_items(&renderers, out_nmemb);
+}
+
+const char*
+bm_version(void)
 {
     return BM_VERSION;
 }
 
+const char*
+bm_renderer_get_name(const struct bm_renderer *renderer)
+{
+    assert(renderer);
+    return renderer->name;
+}
+
 /* vim: set ts=8 sw=4 tw=0 :*/