feat: update build tasks, enhance metadata handling, and improve GUI text display

source/main.c

@@ -11,6 +11,7 @@
 #include <dirent.h>
 #include <stdbool.h>
 #include <stdio.h>
+#include <ctype.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
@@ -146,6 +147,125 @@ static int cmpstringp(const void *p1, const void *p2)
 	return strcasecmp(* (char * const *) p1, * (char * const *) p2);
 }
 
+/* Check filename extension against supported audio types. Case-insensitive. */
+static bool isMusicFilename(const char *name)
+{
+	if(name == NULL)
+		return false;
+
+	const char *ext = strrchr(name, '.');
+	if(ext == NULL || *(ext + 1) == '\0')
+		return false;
+
+	ext++; /* skip dot */
+	char lext[16];
+	size_t i = 0;
+	for(; i < sizeof(lext)-1 && ext[i]; i++)
+		lext[i] = tolower((unsigned char)ext[i]);
+	lext[i] = '\0';
+
+	const char *allowed[] = {"mp3","wav","flac","ogg","opus","sid","m4a","aac", NULL};
+	for(int j = 0; allowed[j] != NULL; j++)
+		if(strcmp(lext, allowed[j]) == 0)
+			return true;
+
+	return false;
+}
+
+/* Build a list of music filenames (basenames) in the given directory. Caller must free array and each string. */
+static int buildMusicFileListInDir(const char *dirpath, char ***outFiles)
+{
+	DIR *dp;
+	struct dirent *ep;
+	char **files = NULL;
+	int fileNum = 0;
+
+	if((dp = opendir(dirpath)) == NULL)
+		return -1;
+
+	while((ep = readdir(dp)) != NULL)
+	{
+		if(ep->d_type == DT_DIR)
+			continue;
+
+		if(!isMusicFilename(ep->d_name))
+			continue;
+
+		files = realloc(files, (fileNum + 1) * sizeof(char*));
+		files[fileNum] = strdup(ep->d_name);
+		fileNum++;
+	}
+
+	if(fileNum > 0)
+		qsort(files, fileNum, sizeof(char*), cmpstringp);
+
+	closedir(dp);
+	*outFiles = files;
+	return fileNum;
+}
+
+/* Play next file in the same folder as the currently-playing file. Returns 0 on success, -1 on failure or no-next. */
+static int playNextFromPath(struct playbackInfo_t *playbackInfo)
+{
+	if(playbackInfo == NULL || playbackInfo->file[0] == '\0')
+		return -1;
+
+	char fullcpy[PATH_MAX];
+	strncpy(fullcpy, playbackInfo->file, sizeof(fullcpy));
+	fullcpy[sizeof(fullcpy)-1] = '\0';
+
+	/* find last slash */
+	char *slash = strrchr(fullcpy, '/');
+	char dirpath[PATH_MAX];
+	char *basename = NULL;
+
+	if(slash == NULL)
+	{
+		/* No directory component; assume current dir */
+		if(getcwd(dirpath, sizeof(dirpath)) == NULL)
+			return -1;
+		basename = fullcpy;
+	}
+	else
+	{
+		size_t dirlen = slash - fullcpy;
+		if(dirlen >= sizeof(dirpath))
+			return -1;
+		memcpy(dirpath, fullcpy, dirlen);
+		dirpath[dirlen] = '\0';
+		basename = slash + 1;
+	}
+
+	char **files = NULL;
+	int count = buildMusicFileListInDir(dirpath, &files);
+	if(count <= 0)
+		return -1;
+
+	int index = -1;
+	for(int i = 0; i < count; i++)
+	{
+		if(strcmp(files[i], basename) == 0)
+		{
+			index = i;
+			break;
+		}
+	}
+
+	int result = -1;
+	if(index >= 0 && index + 1 < count)
+	{
+		char nextpath[PATH_MAX];
+		snprintf(nextpath, sizeof(nextpath), "%s/%s", dirpath, files[index+1]);
+		result = changeFile(nextpath, playbackInfo);
+	}
+
+	for(int i = 0; i < count; i++)
+		free(files[i]);
+	free(files);
+
+	return result;
+}
+
 /**
  * Store the list of files and folders in current directory to an array.
  */