Implement input type configs (#3784)

Add support for configurations that apply to a type of inputs
(i.e. natural scrolling on all touchpads). A type config is
differentiated by a `type:` prefix followed by the type it
corresponds to.

When new devices appear, the device config is merged on top of its
type config (if it exists). New type configs are applied on top of
existing configs.

1 files changed, 36 insertions, 3 deletions

diff --git a/sway/config/input.c b/sway/config/input.c
index 63c28635..aa581431 100644
--- a/sway/config/input.c
+++ b/sway/config/input.c
@@ -18,6 +18,7 @@ struct input_config *new_input_config(const char* identifier) {
                 return NULL;
         }
 
+        input->input_type = NULL;
         input->tap = INT_MIN;
         input->tap_button_map = INT_MIN;
         input->drag = INT_MIN;
@@ -140,6 +141,30 @@ static void merge_wildcard_on_all(struct input_config *wildcard) {
                         merge_input_config(ic, wildcard);
                 }
         }
+
+        for (int i = 0; i < config->input_type_configs->length; i++) {
+                struct input_config *ic = config->input_type_configs->items[i];
+                if (strcmp(wildcard->identifier, ic->identifier) != 0) {
+                        sway_log(SWAY_DEBUG, "Merging input * config on %s", ic->identifier);
+                        merge_input_config(ic, wildcard);
+                }
+        }
+}
+
+static void merge_type_on_existing(struct input_config *type_wildcard) {
+        for (int i = 0; i < config->input_configs->length; i++) {
+                struct input_config *ic = config->input_configs->items[i];
+                if (ic->input_type == NULL) {
+                        continue;
+                }
+
+                if (strcmp(ic->input_type, type_wildcard->identifier + 5) == 0) {
+                        sway_log(SWAY_DEBUG, "Merging %s top of %s",
+                                type_wildcard->identifier,
+                                ic->identifier);
+                        merge_input_config(ic, type_wildcard);
+                }
+        }
 }
 
 struct input_config *store_input_config(struct input_config *ic) {
@@ -148,11 +173,19 @@ struct input_config *store_input_config(struct input_config *ic) {
                 merge_wildcard_on_all(ic);
         }
 
-        int i = list_seq_find(config->input_configs, input_identifier_cmp,
+        list_t *config_list = NULL;
+        if (strncmp(ic->identifier, "type:", 5) == 0) {
+                config_list = config->input_type_configs;
+                merge_type_on_existing(ic);
+        } else {
+                config_list = config->input_configs;
+        }
+
+        int i = list_seq_find(config_list, input_identifier_cmp,
                         ic->identifier);
         if (i >= 0) {
                 sway_log(SWAY_DEBUG, "Merging on top of existing input config");
-                struct input_config *current = config->input_configs->items[i];
+                struct input_config *current = config_list->items[i];
                 merge_input_config(current, ic);
                 free_input_config(ic);
                 ic = current;
@@ -167,7 +200,7 @@ struct input_config *store_input_config(struct input_config *ic) {
                         free_input_config(ic);
                         ic = current;
                 }
-                list_add(config->input_configs, ic);
+                list_add(config_list, ic);
         } else {
                 // New wildcard config. Just add it
                 sway_log(SWAY_DEBUG, "Adding input * config");