Move extension methods

3 files changed, 88 insertions, 0 deletions

diff --git a/lib/extensions/iterable_ext.dart b/lib/extensions/iterable_ext.dart
new file mode 100644
index 0000000..2d0d6e2
--- /dev/null
+++ b/lib/extensions/iterable_ext.dart
@@ -0,0 +1,25 @@
+// Copyright (C) 2025, uvok cheetah
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+extension IterableExt<T> on Iterable<T> {
+  /// The first element satisfying [test], or `null` if there are none.
+  // firstWhereOrElse doesn't want to return null.
+  T? firstWhereOrNull(bool Function(T element) test) {
+    for (final element in this) {
+      if (test(element)) return element;
+    }
+    return null;
+  }
+}
diff --git a/lib/extensions/list_ext.dart b/lib/extensions/list_ext.dart
new file mode 100644
index 0000000..8ef2713
--- /dev/null
+++ b/lib/extensions/list_ext.dart
@@ -0,0 +1,39 @@
+// Copyright (C) 2025, uvok cheetah
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+extension ListExt<T> on List<T> {
+  /// If predicate is true for any element on the list, replace first element on that position.
+  /// Otherwise, add element.
+  void addOrReplaceWhere(T dev, bool Function(T exDev) predicate) {
+    int idx = indexWhere(predicate);
+
+    if (idx == -1) {
+      add(dev);
+    } else {
+      removeAt(idx);
+      insert(idx, dev);
+    }
+  }
+
+  /// An element if the predicate is true only for all elements.
+  /// predicate is passed all existing elements.
+  bool addIf(T dev, bool Function(T exDev) predicate) {
+    if (every(predicate)) {
+      add(dev);
+      return true;
+    }
+    return false;
+  }
+}
diff --git a/lib/extensions/string_ext.dart b/lib/extensions/string_ext.dart
new file mode 100644
index 0000000..6119c5b
--- /dev/null
+++ b/lib/extensions/string_ext.dart
@@ -0,0 +1,24 @@
+// Copyright (C) 2025, uvok cheetah
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+extension StringExt on String {
+  /// split string on first occurrence.
+  /// if s is not inside string, the original value is returned.
+  List<String> splitFirst(String s) {
+    int idx = indexOf(s);
+    if (idx == -1) return [this];
+    return [substring(0, idx).trim(), substring(idx + s.length).trim()];
+  }
+}