Refactor the folder structure which only had 2 'real' modules, now it's more real, no need for splitting into folders beside the external one

src/plugin_directory_navigation.cpp

@@ -0,0 +1,196 @@
+// @todo: On save rename files, delete files it should apply the changes
+// Instead of toying with Reopen maybe it should actually detect changes in directory etc. on update
+
+void CMD_OpenUpFolder() {
+// @todo: Test this for weird cases
+    BSet main = GetBSet(PrimaryWindowID);
+    String name = ChopLastSlash(main.buffer->name);
+    Open(name);
+} RegisterCommand(CMD_OpenUpFolder, "ctrl-o", "Open current's file directory or up directory in other cases");
+
+void InsertDirectoryNavigation(Buffer *buffer) {
+    Assert(buffer->is_dir);
+    Scratch scratch;
+    ResetBuffer(buffer);
+    RawAppendf(buffer, "\n");
+    RawAppendf(buffer, "..\n");
+    for (FileIter it = IterateFiles(scratch, buffer->name); IsValid(it); Advance(&it)) {
+        RawAppendf(buffer, "%S\n", it.filename);
+    }
+}
+
+void UpdateDirectoryNavigation() {
+#if 0
+    ProfileFunction();
+    BSet active = GetBSet(ActiveWindowID);
+    Buffer *buffer = active.buffer;
+
+    Scratch scratch;
+    Array<String> existing_lines = Split(scratch, AllocCharString(scratch, buffer), "\n");
+    bool modified = false;
+    for (FileIter it = IterateFiles(scratch, buffer->name); IsValid(it); Advance(&it)) {
+        bool found = false;
+        ForItem (existing, existing_lines) {
+            if (existing == it.filename) {
+                found = true;
+                UnorderedRemove(&existing_lines, existing);
+                break;
+            }
+        }
+
+        if (found == false) {
+            modified = true;
+            break;
+        }
+    }
+
+    if (existing_lines.len > 1) {
+        modified = true;
+    }
+
+    if (modified) {
+        ReopenBuffer(buffer);
+    }
+
+    UpdateFuzzySearchView();
+#endif
+}
+
+void OpenDirectoryNavigation(View *view) {
+    SetFuzzy(view);
+    // view->update_hook = UpdateDirectoryNavigation;
+    Buffer *buffer = GetBuffer(view->active_buffer);
+    InsertDirectoryNavigation(buffer);
+    SelectRange(view, Range{});
+}
+
+#if 0
+
+typedef struct {
+    HANDLE dir;
+    OVERLAPPED ov;
+    HANDLE event;
+    BYTE buffer[4096];
+    BOOL pending;
+} DirectoryWatcher;
+
+BOOL InitDirectoryWatcher(DirectoryWatcher *w, const wchar_t *path)
+{
+    ZeroMemory(w, sizeof(*w));
+
+    w->dir = CreateFileW(
+        path,
+        FILE_LIST_DIRECTORY,
+        FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
+        NULL,
+        OPEN_EXISTING,
+        FILE_FLAG_BACKUP_SEMANTICS | FILE_FLAG_OVERLAPPED,
+        NULL
+    );
+
+    if (w->dir == INVALID_HANDLE_VALUE)
+        return FALSE;
+
+    w->event = CreateEventW(NULL, TRUE, FALSE, NULL);
+    if (!w->event)
+        return FALSE;
+
+    w->ov.hEvent = w->event;
+    w->pending = FALSE;
+    return TRUE;
+}
+
+BOOL WasDirectoryModified(DirectoryWatcher *w)
+{
+    DWORD bytes;
+
+    if (!w->pending) {
+        ResetEvent(w->event);
+        w->pending = ReadDirectoryChangesW(
+            w->dir,
+            w->buffer,
+            sizeof(w->buffer),
+            TRUE,
+            FILE_NOTIFY_CHANGE_FILE_NAME |
+            FILE_NOTIFY_CHANGE_DIR_NAME  |
+            FILE_NOTIFY_CHANGE_SIZE      |
+            FILE_NOTIFY_CHANGE_LAST_WRITE,
+            NULL,
+            &w->ov,
+            NULL
+        );
+        if (!w->pending)
+            return FALSE;
+    }
+
+    if (WaitForSingleObject(w->event, 0) == WAIT_OBJECT_0) {
+        GetOverlappedResult(w->dir, &w->ov, &bytes, FALSE);
+        w->pending = FALSE;
+        return TRUE;
+    }
+
+    return FALSE;
+}
+
+void DestroyDirectoryWatcher(DirectoryWatcher *w)
+{
+    if (w->dir != INVALID_HANDLE_VALUE)
+        CloseHandle(w->dir);
+    if (w->event)
+        CloseHandle(w->event);
+}
+
+//
+DirectoryWatcher w;
+InitDirectoryWatcher(&w, L"C:\\mydir");
+
+if (WasDirectoryModified(&w)) {
+    // something changed
+}
+
+#if OS_LINUX
+#include <sys/inotify.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+typedef struct {
+    int fd;
+    int wd;
+} DirectoryWatcher;
+
+int InitDirectoryWatcher(DirectoryWatcher *w, const char *path)
+{
+    w->fd = inotify_init1(IN_NONBLOCK);
+    if (w->fd < 0)
+        return 0;
+
+    w->wd = inotify_add_watch(
+        w->fd,
+        path,
+        IN_CREATE | IN_DELETE | IN_MOVE | IN_MODIFY
+    );
+
+    return w->wd >= 0;
+}
+
+int WasDirectoryModified(DirectoryWatcher *w)
+{
+    char buffer[4096];
+    ssize_t len = read(w->fd, buffer, sizeof(buffer));
+
+    if (len > 0)
+        return 1;
+
+    return 0;  // no data = no changes
+}
+
+void DestroyDirectoryWatcher(DirectoryWatcher *w)
+{
+    if (w->wd >= 0)
+        inotify_rm_watch(w->fd, w->wd);
+    if (w->fd >= 0)
+        close(w->fd);
+}
+#endif
+
+#endif