Implement output toggle

discussed in #4136, this can't handle wildcard but won't crash.

5 files changed, 55 insertions, 0 deletions

diff --git a/sway/commands/output.c b/sway/commands/output.c
index 6b9eafdb..3903f10d 100644
--- a/sway/commands/output.c
+++ b/sway/commands/output.c
@@ -19,6 +19,7 @@ static struct cmd_handler output_handlers[] = {
         { "resolution", output_cmd_mode },
         { "scale", output_cmd_scale },
         { "subpixel", output_cmd_subpixel },
+        { "toggle", output_cmd_toggle },
         { "transform", output_cmd_transform },
 };
 
diff --git a/sway/commands/output/toggle.c b/sway/commands/output/toggle.c
new file mode 100644
index 00000000..6342d526
--- /dev/null
+++ b/sway/commands/output/toggle.c
@@ -0,0 +1,37 @@
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "sway/output.h"
+
+struct cmd_results *output_cmd_toggle(int argc, char **argv) {
+        if (!config->handler_context.output_config) {
+                return cmd_results_new(CMD_FAILURE, "Missing output config");
+        }
+
+        struct output_config *oc = config->handler_context.output_config;
+
+        if (strcmp(oc->name, "*") == 0) {
+                return cmd_results_new(CMD_INVALID,
+                                "Cannot apply toggle to all outputs.");
+        }
+
+        struct sway_output *sway_output = all_output_by_name_or_id(oc->name);
+
+        if (sway_output == NULL) {
+                return cmd_results_new(CMD_FAILURE,
+                                "Cannot apply toggle to unknown output %s", oc->name);
+        }
+
+        oc = find_output_config(sway_output);
+
+        if (!oc || oc->enabled != 0) {
+                config->handler_context.output_config->enabled = 0;
+        } else {
+                config->handler_context.output_config->enabled = 1;
+        }
+
+        free(oc);
+        config->handler_context.leftovers.argc = argc;
+        config->handler_context.leftovers.argv = argv;
+        return NULL;
+}
+
diff --git a/sway/desktop/output.c b/sway/desktop/output.c
index 0cc08525..1636a58b 100644
--- a/sway/desktop/output.c
+++ b/sway/desktop/output.c
@@ -42,6 +42,19 @@ struct sway_output *output_by_name_or_id(const char *name_or_id) {
         return NULL;
 }
 
+struct sway_output *all_output_by_name_or_id(const char *name_or_id) {
+        struct sway_output *output;
+        wl_list_for_each(output, &root->all_outputs, link) {
+                char identifier[128];
+                output_get_identifier(identifier, sizeof(identifier), output);
+                if (strcasecmp(identifier, name_or_id) == 0
+                                || strcasecmp(output->wlr_output->name, name_or_id) == 0) {
+                        return output;
+                }
+        }
+        return NULL;
+}
+
 /**
  * Rotate a child's position relative to a parent. The parent size is (pw, ph),
  * the child position is (*sx, *sy) and its size is (sw, sh).
diff --git a/sway/meson.build b/sway/meson.build
index 0f943a1f..05cece7a 100644
--- a/sway/meson.build
+++ b/sway/meson.build
@@ -173,6 +173,7 @@ sway_sources = files(
         'commands/output/position.c',
         'commands/output/scale.c',
         'commands/output/subpixel.c',
+        'commands/output/toggle.c',
         'commands/output/transform.c',
 
         'tree/arrange.c',
diff --git a/sway/sway-output.5.scd b/sway/sway-output.5.scd
index 1efe2f7b..e20d0aba 100644
--- a/sway/sway-output.5.scd
+++ b/sway/sway-output.5.scd
@@ -94,6 +94,9 @@ must be separated by one space. For example:
         Enables or disables the specified output (all outputs are enabled by
         default).
 
+*output* <name> toggle
+        Toggle the specified output.
+
 *output* <name> dpms on|off
         Enables or disables the specified output via DPMS. To turn an output off
         (ie. blank the screen but keep workspaces as-is), one can set DPMS to off.