config: add description-based output matching with desc: prefix

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: Idbe0661f0c491512d61ace4337ebe8cd6a6a6964

include/chroma.h

@@ -250,11 +250,13 @@ void chroma_images_cleanup(chroma_state_t *state);
 int chroma_config_load(chroma_config_t *config, const char *config_file);
 void chroma_config_free(chroma_config_t *config);
 const char *chroma_config_get_image_for_output(chroma_config_t *config,
-                                               const char *output_name);
+                                               const char *output_name,
+                                               const char *output_description);
 int chroma_config_get_mapping_for_output(
     chroma_config_t *config, const char *output_name,
-    chroma_scale_mode_t *scale_mode, chroma_filter_quality_t *filter_quality,
-    chroma_anchor_t *anchor, float *anchor_x, float *anchor_y);
+    const char *output_description, chroma_scale_mode_t *scale_mode,
+    chroma_filter_quality_t *filter_quality, chroma_anchor_t *anchor,
+    float *anchor_x, float *anchor_y);
 
 void chroma_config_print(const chroma_config_t *config);
 

src/config.c

@@ -3,6 +3,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <strings.h>
 
 #include "../include/chroma.h"
 
@@ -27,6 +28,38 @@ static char *trim_whitespace(char *str) {
 }
 
 // Remove quotes from a string
+// Match output name/description against a config pattern
+// Supports:
+//   - Exact name match: "DP-1" matches wl_output.name == "DP-1"
+//   - Description prefix match: "desc:Samsung" matches if description starts
+//   with "Samsung"
+static bool match_output(const char *pattern, const char *output_name,
+                         const char *output_description) {
+  if (!pattern || !output_name) {
+    return false;
+  }
+
+  // Try exact name match first
+  if (strcmp(pattern, output_name) == 0) {
+    return true;
+  }
+
+  // Check for description prefix match: "desc:<prefix>"
+  if (strncmp(pattern, "desc:", 5) == 0) {
+    const char *desc_prefix = pattern + 5;
+    size_t prefix_len = strlen(desc_prefix);
+
+    if (output_description && prefix_len > 0) {
+      // Match if description starts with the prefix (case-insensitive)
+      if (strncasecmp(output_description, desc_prefix, prefix_len) == 0) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+}
+
 static char *remove_quotes(char *str) {
   size_t len = strlen(str);
   if (len >= 2 && ((str[0] == '"' && str[len - 1] == '"') ||
@@ -660,16 +693,19 @@ void chroma_config_free(chroma_config_t *config) {
 
 // Get image path for specific output
 const char *chroma_config_get_image_for_output(chroma_config_t *config,
-                                               const char *output_name) {
+                                               const char *output_name,
+                                               const char *output_description) {
   if (!config || !output_name) {
     return NULL;
   }
 
-  // Look for specific output mapping
+  // Look for specific output mapping (name or description match)
   for (int i = 0; i < config->mapping_count; i++) {
-    if (strcmp(config->mappings[i].output_name, output_name) == 0) {
-      chroma_log("DEBUG", "Found specific mapping for output %s: %s",
-                 output_name, config->mappings[i].image_path);
+    if (match_output(config->mappings[i].output_name, output_name,
+                     output_description)) {
+      chroma_log("DEBUG", "Found specific mapping for output %s (desc: %s): %s",
+                 output_name, output_description ? output_description : "none",
+                 config->mappings[i].image_path);
       return config->mappings[i].image_path;
     }
   }
@@ -689,25 +725,28 @@ const char *chroma_config_get_image_for_output(chroma_config_t *config,
 // quality, anchor, and custom anchor coordinates
 int chroma_config_get_mapping_for_output(
     chroma_config_t *config, const char *output_name,
-    chroma_scale_mode_t *scale_mode, chroma_filter_quality_t *filter_quality,
-    chroma_anchor_t *anchor, float *anchor_x, float *anchor_y) {
+    const char *output_description, chroma_scale_mode_t *scale_mode,
+    chroma_filter_quality_t *filter_quality, chroma_anchor_t *anchor,
+    float *anchor_x, float *anchor_y) {
   if (!config || !output_name || !scale_mode || !filter_quality || !anchor ||
       !anchor_x || !anchor_y) {
     return CHROMA_ERROR_INIT;
   }
 
-  // Look for specific output mapping
+  // Look for specific output mapping (name or description match)
   for (int i = 0; i < config->mapping_count; i++) {
-    if (strcmp(config->mappings[i].output_name, output_name) == 0) {
+    if (match_output(config->mappings[i].output_name, output_name,
+                     output_description)) {
       *scale_mode = config->mappings[i].scale_mode;
       *filter_quality = config->mappings[i].filter_quality;
       *anchor = config->mappings[i].anchor;
       *anchor_x = config->mappings[i].anchor_x;
       *anchor_y = config->mappings[i].anchor_y;
       chroma_log("DEBUG",
-                 "Found specific mapping for output %s: scale=%s, filter=%s, "
-                 "anchor=%s @ %.1f,%.1f",
-                 output_name, scale_mode_to_string(*scale_mode),
+                 "Found specific mapping for output %s (desc: %s): scale=%s, "
+                 "filter=%s, anchor=%s @ %.1f,%.1f",
+                 output_name, output_description ? output_description : "none",
+                 scale_mode_to_string(*scale_mode),
                  filter_quality_to_string(*filter_quality),
                  anchor_to_string(*anchor), *anchor_x, *anchor_y);
       return CHROMA_OK;

src/core.c

@@ -77,7 +77,8 @@ static int assign_wallpaper_to_output(chroma_state_t *state,
 
   // Get image path for this output
   const char *image_path = chroma_config_get_image_for_output(
-      &state->config, output->name ? output->name : "unknown");
+      &state->config, output->name ? output->name : "unknown",
+      output->description);
   if (!image_path) {
     chroma_log("WARN", "No wallpaper configured for output %u (%s)", output->id,
                output->name ? output->name : "unknown");
@@ -121,8 +122,8 @@ static int assign_wallpaper_to_output(chroma_state_t *state,
   // anchor coords)
   if (chroma_config_get_mapping_for_output(
           &state->config, output->name ? output->name : "unknown",
-          &output->scale_mode, &output->filter_quality, &output->anchor,
-          &output->anchor_x, &output->anchor_y) == CHROMA_OK) {
+          output->description, &output->scale_mode, &output->filter_quality,
+          &output->anchor, &output->anchor_x, &output->anchor_y) == CHROMA_OK) {
     output->config_loaded = true;
     chroma_log("DEBUG",
                "Loaded config for output %u: scale=%d, filter=%d, anchor=%d @ "