Write to swaynag pipe fd directly on config errors

include/sway/commands.h

@@ -150,6 +150,7 @@ sway_cmd cmd_splitt;
 sway_cmd cmd_splitv;
 sway_cmd cmd_sticky;
 sway_cmd cmd_swaybg_command;
+sway_cmd cmd_swaynag_command;
 sway_cmd cmd_swap;
 sway_cmd cmd_title_format;
 sway_cmd cmd_unmark;

include/sway/config.h

@@ -7,6 +7,7 @@
 #include <wlr/types/wlr_box.h>
 #include <xkbcommon/xkbcommon.h>
 #include "list.h"
+#include "swaynag.h"
 #include "tree/layout.h"
 #include "tree/container.h"
 #include "wlr-layer-shell-unstable-v1-protocol.h"
@@ -308,7 +309,8 @@ enum focus_wrapping_mode {
  * The configuration struct. The result of loading a config file.
  */
 struct sway_config {
-	pid_t swaynag_pid;
+	char *swaynag_command;
+	struct swaynag_instance swaynag_config_errors;
 	list_t *symbols;
 	list_t *modes;
 	list_t *bars;
@@ -346,6 +348,7 @@ struct sway_config {
 	bool failed;
 	bool reloading;
 	bool reading;
+	bool validating;
 	bool auto_back_and_forth;
 	bool show_marks;
 
@@ -404,18 +407,19 @@ struct sway_config {
  * Loads the main config from the given path. is_active should be true when
  * reloading the config.
  */
-bool load_main_config(const char *path, bool is_active, char **errors);
+bool load_main_config(const char *path, bool is_active, bool validating);
 
 /**
  * Loads an included config. Can only be used after load_main_config.
  */
 bool load_include_configs(const char *path, struct sway_config *config,
-		char **errors);
+		struct swaynag_instance *swaynag);
 
 /**
  * Reads the config from the given FILE.
  */
-bool read_config(FILE *file, struct sway_config *config, char **errors);
+bool read_config(FILE *file, struct sway_config *config,
+		struct swaynag_instance *swaynag);
 
 /**
  * Free config struct
@@ -424,8 +428,6 @@ void free_config(struct sway_config *config);
 
 void free_sway_variable(struct sway_variable *var);
 
-void spawn_swaynag_config_errors(struct sway_config *config, char *errors);
-
 /**
  * Does variable replacement for a string based on the config's currently loaded variables.
  */

include/sway/swaynag.h

@@ -0,0 +1,33 @@
+#ifndef _SWAY_SWAYNAG_H
+#define _SWAY_SWAYNAG_H
+
+struct swaynag_instance {
+	const char *args;
+	pid_t pid;
+	int fd[2];
+	bool detailed;
+};
+
+// Copy all fields of one instance to another
+void swaynag_clone(struct swaynag_instance *dest,
+		struct swaynag_instance *src);
+
+// Spawn swaynag. If swaynag->detailed, then swaynag->fd[1] will left open
+// so it can be written to. Call swaynag_show when done writing. This will
+// be automatically called by swaynag_log if the instance is not spawned and
+// swaynag->detailed is true.
+bool swaynag_spawn(const char *swaynag_command,
+		struct swaynag_instance *swaynag);
+
+// Kill the swaynag instance
+void swaynag_kill(struct swaynag_instance *swaynag);
+
+// Write a log message to swaynag->fd[1]. This will fail when swaynag->detailed
+// is false.
+void swaynag_log(const char *swaynag_command, struct swaynag_instance *swaynag,
+		const char *fmt, ...);
+
+// If swaynag->detailed, close swaynag->fd[1] so swaynag displays
+void swaynag_show(struct swaynag_instance *swaynag);
+
+#endif