Split up main.c while keeping a single compilation unit

src/library.c

@@ -0,0 +1,93 @@
+typedef struct {
+    bool is_dir;
+    SV name;
+    SV full_path;
+    struct tm modified_at;
+} Library_Entry;
+
+typedef struct {
+    Library_Entry *elems;
+    size_t count;
+    size_t capacity;
+} Library_Entries;
+
+/*
+ * Helper to format an entry's last modified date into a temporary buffer.
+ * The same buffer will be reused the next time this function is called.
+ */
+static char *format_time(Library_Entry entry) {
+    static char time_buffer[32];
+    strftime((char*)&time_buffer, 32, "%Y-%m-%dT%H:%M:%S.0000000Z", &entry.modified_at);
+    return (char*)time_buffer;
+}
+
+static int compare_library_entries(const void *a, const void *b) {
+    Library_Entry lea = *(Library_Entry*)a;
+    Library_Entry leb = *(Library_Entry*)b;
+
+    if (lea.is_dir && !leb.is_dir) return -1;
+    if (!lea.is_dir && leb.is_dir) return 1;
+
+    return noh_sv_compare(lea.name, leb.name);
+}
+
+static void set_modified_time(Library_Entry *entry) {
+    struct stat attr;
+    if (stat(noh_arena_sprintf(&temp, Nsv_Fmt, entry->full_path), &attr) == 0) {
+        struct tm *timeinfo = localtime(&attr.st_mtime);
+        entry->modified_at = *timeinfo;
+    } else {
+        entry->modified_at = (struct tm){0};
+    }
+}
+
+#define build_path(url, first, ...) build_path_((url), (first), __VA_ARGS__, NULL)
+static Noh_String build_path_(bool url, SV *first, ...) {
+    va_list args;
+    SV *elem_ = first;
+    va_start(args, first);
+    bool start = true;
+    Noh_String result = {0};
+    if (url) noh_string_append_cstr(&result, "/");
+
+    while (elem_ != NULL) {
+        SV elem = *elem_;
+        while (elem.count > 0) {
+            SV component = noh_sv_chop_by_delim(&elem, '/');
+            if (noh_sv_eq(component, sv(".."))) continue;
+
+            if (component.count > 0) {
+                if (start) start = false; else noh_string_append_cstr(&result, "/");
+                noh_string_append_sv(&result, component);
+            }
+        }
+
+        elem_ = va_arg(args, SV *);
+    }
+    va_end(args);
+
+    return result;
+}
+
+/**
+ * Creates a Library entry from a dirent structure.
+ */
+static bool create_entry(struct dirent *dir_entry, const char *parent_path, Library_Entry *result) {
+    SV name = sv(dir_entry->d_name);
+    SV parent_path_sv = sv(parent_path);
+    Noh_String full_path = build_path(false, &parent_path_sv, &name);
+    int type = dir_entry->d_type;
+
+    // Check if the entry is relevant.
+    if (type != DT_DIR && type != DT_REG) return false;
+    if (noh_sv_eq(name, sv(".")) || noh_sv_eq(name, sv(".."))) return false;
+    if (type == DT_REG && !noh_sv_ends_with_ci(name, sv(".epub"))) return false;
+
+    // Set entry data.
+    result->is_dir = type == DT_DIR;
+    result->full_path = noh_sv_from_string(full_path);
+    result->name = noh_sv_copy_cstr(&temp, dir_entry->d_name);
+    set_modified_time(result);
+
+    return true;
+}