osdep/file_dialog-external: add implementation for kdialog and zenity

meson.build

@@ -551,7 +551,7 @@ if not posix and not features['win32-desktop']
 endif
 
 if not win32 and not darwin
-    sources += files('osdep/file_dialog-dummy.c')
+    sources += files('osdep/file_dialog-external.c')
 endif
 
 # media controls

osdep/file_dialog-external.c

@@ -0,0 +1,166 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "file_dialog.h"
+
+#include <player/core.h>
+
+#include "subprocess.h"
+
+#define MAX_ARGS 32
+
+struct subprocess_fd_ctx {
+    struct mp_log *log;
+    void* talloc_ctx;
+    int fd;
+    bstr output;
+};
+
+static void subprocess_read(void *p, char *data, size_t size)
+{
+    struct subprocess_fd_ctx *ctx = p;
+    if (ctx->fd == STDOUT_FILENO) {
+        bstr_xappend(ctx->talloc_ctx, &ctx->output, (bstr){data, size});
+        ctx->output = bstr_strip_linebreaks(ctx->output);
+    } else {
+        mp_msg(ctx->log, MSGL_ERR, "%.*s", (int)size, data);
+    }
+}
+
+static void kdialog(void *talloc_ctx, const char *args[MAX_ARGS],
+                    const mp_file_dialog_params *params)
+{
+    int i = 0;
+
+    args[i++] = "kdialog";
+
+    if (params->flags & MP_FILE_DIALOG_SAVE) {
+        args[i++] = "--getsavefilename";
+    } else if (params->flags & MP_FILE_DIALOG_DIRECTORY) {
+        args[i++] = "--getexistingdirectory";
+    } else {
+        args[i++] = "--getopenfilename";
+        if (params->flags & MP_FILE_DIALOG_MULTIPLE)
+            args[i++] = "--multiple";
+    }
+
+    args[i++] = params->initial_dir ? params->initial_dir : ".";
+
+    if (params->filters) {
+        char *filter = talloc_strdup(talloc_ctx, "All Files (*)");
+        for (const mp_file_dialog_filters *f = params->filters; f->name; f++) {
+            filter = talloc_asprintf_append(filter, "|%s (", f->name);
+            for (char **ext = f->extensions; *ext; ext++)
+                filter = talloc_asprintf_append(filter, ext[1] ?  "*.%s " : "*.%s)", *ext);
+        }
+        args[i++] = filter;
+        assert(i < MAX_ARGS - 1);
+    }
+
+    args[i++] = NULL;
+}
+
+static void zenity(void *talloc_ctx, const char *args[MAX_ARGS],
+                   const mp_file_dialog_params *params)
+{
+    int i = 0;
+
+    args[i++] = "zenity";
+    args[i++] = "--file-selection";
+
+    if (params->flags & MP_FILE_DIALOG_DIRECTORY) {
+        args[i++] = "--directory";
+    } else if (params->flags & MP_FILE_DIALOG_SAVE) {
+        args[i++] = "--save";
+    } else if (params->flags & MP_FILE_DIALOG_MULTIPLE) {
+        args[i++] = "--multiple";
+        args[i++] = "--separator=':'";
+    }
+
+    if (params->title) {
+        args[i++] = "--title";
+        args[i++] = params->title;
+    }
+
+    if (params->filters) {
+        args[i++] = "--file-filter";
+        args[i++] = talloc_strdup(talloc_ctx, "All Files | *");
+        for (const mp_file_dialog_filters *f = params->filters; f->name; f++) {
+            char *filter = talloc_asprintf(talloc_ctx, "%s |", f->name);
+            for (char **ext = f->extensions; *ext; ext++)
+                filter = talloc_asprintf_append(filter, " *.%s", *ext);
+            assert(i < MAX_ARGS - 2);
+            args[i++] = "--file-filter";
+            args[i++] = filter;
+        }
+    }
+
+    args[i++] = NULL;
+}
+
+
+typedef void (*dialog_func_t)(void *talloc_ctx, const char *args[MAX_ARGS],
+                              const mp_file_dialog_params *params);
+
+const dialog_func_t dialogs[] = {
+    kdialog,
+    zenity,
+    NULL,
+};
+
+char *mp_file_dialog_get_files(void *talloc_ctx, struct MPContext *mpctx,
+                               const mp_file_dialog_params *params)
+{
+    void *tmp = talloc_new(NULL);
+    const char *args[MAX_ARGS] = {0};
+    struct mp_subprocess_opts opts = {
+        .args = (char **)args,
+    };
+    struct mp_log *log = mp_log_new(tmp, mpctx->log, "file_dialog");
+    struct subprocess_fd_ctx ctx[2];
+    for (int fd = 1; fd < 3; fd++) {
+        ctx[opts.num_fds] = (struct subprocess_fd_ctx) {
+            .log = log,
+            .talloc_ctx = tmp,
+            .fd = fd,
+        };
+        opts.fds[opts.num_fds] = (struct mp_subprocess_fd) {
+            .fd = fd,
+            .src_fd = -1,
+            .on_read = subprocess_read,
+            .on_read_ctx = &ctx[opts.num_fds],
+        };
+        opts.num_fds++;
+    }
+
+    struct mp_subprocess_result res ;
+
+    for (int i = 0; dialogs[i]; i++) {
+        dialogs[i](tmp, (const char **)opts.args, params);
+        opts.exe = opts.args[0];
+        mp_subprocess(log, &opts, &res);
+        if (res.error == MP_SUBPROCESS_OK)
+            break;
+    }
+
+    char *ret = NULL;
+    if (res.error == MP_SUBPROCESS_OK && res.exit_status == 0)
+        ret = bstrdup0(talloc_ctx, ctx[0].output);
+
+    talloc_free(tmp);
+    return ret;
+}