Introduce the MimeHandler class

include/Desktop/mime.h

@@ -32,6 +32,7 @@
 # define LIBDESKTOP_DESKTOP_MIME_H
 
 # include <gtk/gtk.h>
+# include "mimehandler.h"
 
 
 /* Mime */
@@ -47,7 +48,7 @@ Mime * mime_new(GtkIconTheme * theme);
 void mime_delete(Mime * mime);
 
 /* accessors */
-char const * mime_get_handler(Mime * mime, char const * type,
+MimeHandler * mime_get_handler(Mime * mime, char const * type,
 		char const * action);
 int mime_set_handler(Mime * mime, char const * type, char const * action,
 		char const * handler);

include/Desktop/mimehandler.h

@@ -0,0 +1,70 @@
+/* $Id$ */
+/* Copyright (c) 2017 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS Desktop libDesktop */
+/* All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
+
+
+
+#ifndef LIBDESKTOP_DESKTOP_MIMEHANDLER_H
+# define LIBDESKTOP_DESKTOP_MIMEHANDLER_H
+
+# include <System/config.h>
+# include <System/string.h>
+
+
+/* MimeHandler */
+/* types */
+typedef struct _Hash MimeHandler;
+
+typedef enum _MimeHandlerType
+{
+	MIME_HANDLER_TYPE_UNKNOWN = 0,
+	MIME_HANDLER_TYPE_APPLICATION,
+	MIME_HANDLER_TYPE_DIRECTORY,
+	MIME_HANDLER_TYPE_URL
+} MimeHandlerType;
+
+
+/* functions */
+MimeHandler * mimehandler_new(void);
+MimeHandler * mimehandler_new_load(String const * name);
+void mimehandler_delete(MimeHandler * handler);
+
+/* accessors */
+int mimehandler_can_display(MimeHandler * handler);
+int mimehandler_can_execute(MimeHandler * handler);
+
+String const * mimehandler_get_name(MimeHandler * handler);
+String const * mimehandler_get_program(MimeHandler * handler);
+MimeHandlerType mimehandler_get_type(MimeHandler * handler);
+
+int mimehandler_is_hidden(MimeHandler * handler);
+
+/* useful */
+int mimehandler_load_by_name(MimeHandler * handler, String const * name);
+int mimehandler_save(MimeHandler * handler);
+
+#endif /* !LIBDESKTOP_DESKTOP_MIMEHANDLER_H */

include/Desktop/project.conf

@@ -1,4 +1,4 @@
-includes=about.h,accel.h,compat.h,help.h,menubar.h,message.h,mime.h,toolbar.h,widget.h
+includes=about.h,accel.h,compat.h,help.h,menubar.h,message.h,mime.h,mimehandler.h,toolbar.h,widget.h
 dist=Makefile
 
 [about.h]
@@ -22,6 +22,9 @@ install=$(INCLUDEDIR)/Desktop
 [mime.h]
 install=$(INCLUDEDIR)/Desktop
 
+[mimehandler.h]
+install=$(INCLUDEDIR)/Desktop
+
 [toolbar.h]
 install=$(INCLUDEDIR)/Desktop
 

src/mime.c

@@ -225,7 +225,7 @@ void mime_delete(Mime * mime)
 
 /* accessors */
 /* mime_get_handler */
-char const * mime_get_handler(Mime * mime, char const * type,
+MimeHandler * mime_get_handler(Mime * mime, char const * type,
 		char const * action)
 {
 	char const * program;
@@ -250,7 +250,7 @@ char const * mime_get_handler(Mime * mime, char const * type,
 	q[2] = '\0';
 	program = config_get(mime->config, p, action);
 	free(p);
-	return program;
+	return mimehandler_new_load(program);
 }
 
 

src/mimehandler.c

@@ -0,0 +1,257 @@
+/* $Id$ */
+/* Copyright (c) 2017 Pierre Pronchery <khorben@defora.org> */
+/* This file is part of DeforaOS libDesktop */
+/* All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+ * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
+ * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
+
+
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include "Desktop.h"
+
+
+/* private */
+/* constants */
+#define EXTENSION	".desktop"
+#define SECTION		"Desktop Entry"
+
+
+/* public */
+/* functions */
+/* mimehandler_new */
+MimeHandler * mimehandler_new(void)
+{
+	return config_new();
+}
+
+
+/* mimehandler_new_load */
+MimeHandler * mimehandler_new_load(String const * name)
+{
+	MimeHandler * handler;
+
+	if((handler = mimehandler_new()) == NULL)
+		return NULL;
+	if(mimehandler_load_by_name(handler, name) != 0)
+	{
+		mimehandler_delete(handler);
+		return NULL;
+	}
+	return handler;
+}
+
+
+/* mimehandler_delete */
+void mimehandler_delete(MimeHandler * handler)
+{
+	config_delete(handler);
+}
+
+
+/* accessors */
+/* mimehandler_can_display */
+int mimehandler_can_display(MimeHandler * handler)
+{
+	String const * p;
+
+	if((p = config_get(handler, SECTION, "NoDisplay")) == NULL)
+		return 1;
+	return (string_compare(p, "true") == 0) ? 1 : 0;
+}
+
+
+/* mimehandler_can_execute */
+static int _can_execute_access(String const * path, int mode);
+static int _can_execute_access_path(String const * path,
+		String const * filename, int mode);
+
+int mimehandler_can_execute(MimeHandler * handler)
+{
+	String const * p;
+
+	if(mimehandler_get_type(handler) != MIME_HANDLER_TYPE_APPLICATION)
+		return 0;
+	if((p = config_get(handler, SECTION, "TryExec")) == NULL)
+		return 1;
+	return _can_execute_access(p, X_OK);
+}
+
+static int _can_execute_access(String const * path, int mode)
+{
+	int ret = -1;
+	String const * p;
+	String * q;
+	String * last;
+
+	if(path[0] == '/')
+		return access(path, mode);
+	if((p = getenv("PATH")) == NULL)
+		return 0;
+	if((q = string_new(p)) == NULL)
+		return 0;
+	for(p = strtok_r(q, ":", &last); p != NULL;
+			p = strtok_r(NULL, ":", &last))
+		ret = _can_execute_access_path(p, path, mode);
+	string_delete(q);
+	return ret;
+}
+
+static int _can_execute_access_path(String const * path,
+		String const * filename, int mode)
+{
+	int ret;
+	String * p;
+
+	if((p = string_new_append(path, "/", filename, NULL)) == NULL)
+		return -1;
+	ret = access(p, mode);
+	string_delete(p);
+	return ret;
+}
+
+
+/* mimehandler_get_name */
+String const * mimehandler_get_name(MimeHandler * handler)
+{
+	return config_get(handler, SECTION, "Name");
+}
+
+
+/* mimehandler_get_program */
+String const * mimehandler_get_program(MimeHandler * handler)
+{
+	switch(mimehandler_get_type(handler))
+	{
+		case MIME_HANDLER_TYPE_APPLICATION:
+			/* XXX may be a format string */
+			return config_get(handler, SECTION, "Exec");
+		case MIME_HANDLER_TYPE_DIRECTORY:
+		case MIME_HANDLER_TYPE_UNKNOWN:
+		case MIME_HANDLER_TYPE_URL:
+			return NULL;
+	}
+	return NULL;
+}
+
+
+/* mimehandler_get_type */
+MimeHandlerType mimehandler_get_type(MimeHandler * handler)
+{
+	String const * type;
+	struct
+	{
+		String const * name;
+		MimeHandlerType type;
+	} types[] =
+	{
+		{ "Application",MIME_HANDLER_TYPE_APPLICATION	},
+		{ "Directory",	MIME_HANDLER_TYPE_DIRECTORY	},
+		{ "URL",	MIME_HANDLER_TYPE_URL		}
+	};
+	size_t i;
+
+	if((type = config_get(handler, SECTION, "Type")) == NULL)
+		return MIME_HANDLER_TYPE_UNKNOWN;
+	for(i = 0; i < sizeof(types) / sizeof(*types); i++)
+		if(string_compare(types[i].name, type) == 0)
+			return types[i].type;
+	return MIME_HANDLER_TYPE_UNKNOWN;
+}
+
+
+/* mimehandler_is_hidden */
+int mimehandler_is_hidden(MimeHandler * handler)
+{
+	String const * p;
+
+	if((p = config_get(handler, SECTION, "Hidden")) == NULL)
+		return 0;
+	return (string_compare(p, "true") == 0) ? 1 : 0;
+}
+
+
+/* useful */
+/* mimehandler_load_by_name */
+static int _load_by_name_path(MimeHandler * handler, String const * name,
+		String const * path);
+
+int mimehandler_load_by_name(MimeHandler * handler, String const * name)
+{
+	int ret;
+	String const fallback[] = ".local/share";
+	String const * path;
+	String const * homedir;
+	String * p;
+	String const * q;
+	String * last;
+
+	/* use $XDG_DATA_HOME if set and not empty */
+	if((path = getenv("XDG_DATA_HOME")) != NULL && strlen(path) > 0
+			&& _load_by_name_path(handler, name, path) == 0)
+		return 0;
+	/* fallback to "$HOME/.local/share" */
+	if((homedir = getenv("HOME")) == NULL)
+		homedir = g_get_home_dir();
+	if((p = string_new_append(homedir, "/", fallback, NULL)) == NULL)
+		return -1;
+	ret = _load_by_name_path(handler, name, p);
+	string_delete(p);
+	if(ret == 0)
+		return ret;
+	/* read through every XDG application folder */
+	if((path = getenv("XDG_DATA_DIRS")) == NULL || strlen(path) == 0)
+		path = "/usr/local/share:/usr/share";
+	if((p = string_new(path)) == NULL)
+		return -1;
+	for(q = strtok_r(p, ":", &last); q != NULL;
+			q = strtok_r(NULL, ":", &last))
+		if((ret = _load_by_name_path(handler, name, q)) == 0)
+			break;
+	string_delete(p);
+	return ret;
+}
+
+static int _load_by_name_path(MimeHandler * handler, String const * name,
+		String const * path)
+{
+	int ret;
+	String const applications[] = "/applications/";
+	String * pathname;
+
+	if((pathname = string_new_append(path, applications, name, EXTENSION,
+					NULL)) == NULL)
+		return -1;
+	ret = (config_reset(handler) == 0
+			&& config_load(handler, pathname) == 0
+			&& mimehandler_get_type(handler)
+				!= MIME_HANDLER_TYPE_UNKNOWN
+			&& mimehandler_get_name(handler) != NULL
+			&& mimehandler_is_hidden(handler) == 0)
+		? 0 : -1;
+	string_delete(pathname);
+	return ret;
+}

src/project.conf

@@ -12,7 +12,7 @@ dist=Makefile
 
 [libDesktop]
 type=library
-sources=about.c,accel.c,compat.c,help.c,menubar.c,message.c,mime.c,toolbar.c,widget.c
+sources=about.c,accel.c,compat.c,help.c,menubar.c,message.c,mime.c,mimehandler.c,toolbar.c,widget.c
 install=$(PREFIX)/lib
 
 [help.c]