player: reorganize how lua scripts are loaded

Make loading of scripts independent of Lua. Move some of the loading
code from lua.c to scripting.c, and make it easier to add new scripting
backends.

1 files changed, 179 insertions, 0 deletions

diff --git a/player/scripting.c b/player/scripting.c
new file mode 100644
index 0000000000..ed7a1c2d3b
--- /dev/null
+++ b/player/scripting.c
@@ -0,0 +1,179 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <string.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <math.h>
+#include <pthread.h>
+#include <assert.h>
+
+#include "config.h"
+
+#include "osdep/io.h"
+
+#include "common/common.h"
+#include "common/msg.h"
+#include "options/path.h"
+#include "bstr/bstr.h"
+#include "core.h"
+#include "client.h"
+#include "libmpv/client.h"
+
+extern const struct mp_scripting mp_scripting_lua;
+
+static const struct mp_scripting *scripting_backends[] = {
+#if HAVE_LUA
+    &mp_scripting_lua,
+#endif
+    NULL
+};
+
+static char *script_name_from_filename(void *talloc_ctx, const char *fname)
+{
+    fname = mp_basename(fname);
+    if (fname[0] == '@')
+        fname += 1;
+    char *name = talloc_strdup(talloc_ctx, fname);
+    // Drop file extension
+    char *dot = strrchr(name, '.');
+    if (dot)
+        *dot = '\0';
+    // Turn it into a safe identifier - this is used with e.g. dispatching
+    // input via: "send scriptname ..."
+    for (int n = 0; name[n]; n++) {
+        char c = name[n];
+        if (!(c >= 'A' && c <= 'Z') && !(c >= 'a' && c <= 'z') &&
+            !(c >= '0' && c <= '9'))
+            name[n] = '_';
+    }
+    return talloc_asprintf(talloc_ctx, "%s", name);
+}
+
+struct thread_arg {
+    const struct mp_scripting *backend;
+    mpv_handle *client;
+    const char *fname;
+};
+
+static void *script_thread(void *p)
+{
+    pthread_detach(pthread_self());
+
+    struct thread_arg *arg = p;
+    struct mp_log *log = mp_client_get_log(arg->client);
+
+    mp_verbose(log, "Loading script...\n");
+
+    if (arg->backend->load(arg->client, arg->fname) < 0)
+        mp_err(log, "Could not load script %s\n", arg->fname);
+
+    mp_verbose(log, "Exiting...\n");
+
+    mpv_destroy(arg->client);
+    talloc_free(arg);
+    return NULL;
+}
+
+static void mp_load_script(struct MPContext *mpctx, const char *fname)
+{
+    char *ext = mp_splitext(fname, NULL);
+    const struct mp_scripting *backend = NULL;
+    for (int n = 0; scripting_backends[n]; n++) {
+        const struct mp_scripting *b = scripting_backends[n];
+        if (ext && strcasecmp(ext, b->file_ext) == 0) {
+            backend = b;
+            break;
+        }
+    }
+
+    if (!backend) {
+        MP_WARN(mpctx, "Can't load unknown script: %s\n", fname);
+        return;
+    }
+
+    struct thread_arg *arg = talloc_ptrtype(NULL, arg);
+    char *name = script_name_from_filename(arg, fname);
+    *arg = (struct thread_arg){
+        .fname = talloc_strdup(arg, fname),
+        .backend = backend,
+        // Create the client before creating the thread; otherwise a race
+        // condition could happen, where MPContext is destroyed while the
+        // thread tries to create the client.
+        .client = mp_new_client(mpctx->clients, name),
+    };
+    if (!arg->client) {
+        talloc_free(arg);
+        return;
+    }
+
+    pthread_t thread;
+    if (pthread_create(&thread, NULL, script_thread, arg))
+        talloc_free(arg);
+
+    return;
+}
+
+static int compare_filename(const void *pa, const void *pb)
+{
+    char *a = (char *)pa;
+    char *b = (char *)pb;
+    return strcmp(a, b);
+}
+
+static char **list_script_files(void *talloc_ctx, char *path)
+{
+    char **files = NULL;
+    int count = 0;
+    DIR *dp = opendir(path);
+    if (!dp)
+        return NULL;
+    struct dirent *ep;
+    while ((ep = readdir(dp))) {
+        char *fname = mp_path_join(talloc_ctx, bstr0(path), bstr0(ep->d_name));
+        struct stat s;
+        if (!mp_stat(fname, &s) && S_ISREG(s.st_mode))
+            MP_TARRAY_APPEND(talloc_ctx, files, count, fname);
+    }
+    closedir(dp);
+    qsort(files, count, sizeof(char *), compare_filename);
+    MP_TARRAY_APPEND(talloc_ctx, files, count, NULL);
+    return files;
+}
+
+void mp_load_scripts(struct MPContext *mpctx)
+{
+    // Load scripts from options
+    if (mpctx->opts->lua_load_osc)
+        mp_load_script(mpctx, "@osc.lua");
+    char **files = mpctx->opts->lua_files;
+    for (int n = 0; files && files[n]; n++) {
+        if (files[n][0])
+            mp_load_script(mpctx, files[n]);
+    }
+    if (!mpctx->opts->auto_load_scripts)
+        return;
+    // Load ~/.mpv/lua/*
+    void *tmp = talloc_new(NULL);
+    char *script_path = mp_find_user_config_file(tmp, mpctx->global, "lua");
+    if (script_path) {
+        files = list_script_files(tmp, script_path);
+        for (int n = 0; files && files[n]; n++)
+            mp_load_script(mpctx, files[n]);
+    }
+    talloc_free(tmp);
+}