Rewrite app in C++

Signed-off-by: Kaito Udagawa <umireon@kaito.tokyo>

Author: umireon

.clang-format

@@ -0,0 +1,8 @@
+# SPDX-FileCopyrightText: 2026 Kaito Udagawa <umireon@kaito.tokyo>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+BasedOnStyle: LLVM
+Standard: c++20
+ColumnLimit: 120
+InsertNewlineAtEOF: true

.clang-tidy

@@ -0,0 +1,15 @@
+# SPDX-FileCopyrightText: 2026 Kaito Udagawa <umireon@kaito.tokyo>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+Checks: >
+  bugprone-*,
+  clang-analyzer-*,
+  performance-*,
+  modernize-*,
+  portability-*,
+  -portability-avoid-pragma-once
+
+WarningsAsErrors: ""
+HeaderFilterRegex: ".*"
+FormatStyle: file

.clangd

@@ -0,0 +1,6 @@
+# SPDX-FileCopyrightText: 2026 Kaito Udagawa <umireon@kaito.tokyo>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+CompileFlags:
+  CompilationDatabase: build

.github/instructions/swift6.instructions.md

@@ -34,7 +34,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
 
@@ -53,35 +53,14 @@ jobs:
         shell: bash --noprofile --norc -euo pipefail -O nullglob {0}
         run: reuse lint
 
-  check-swift-format:
-    runs-on: ubuntu-24.04
-    timeout-minutes: 10
-    permissions:
-      contents: read
-    steps:
-      - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
-        with:
-          persist-credentials: false
-
-      - name: Print swift-format version
-        shell: bash --noprofile --norc -euo pipefail -O nullglob {0}
-        run: |
-          swift format --version
-
-      - name: Check with swift-format
-        shell: bash --noprofile --norc -euo pipefail -O nullglob {0}
-        run: |
-          swift format lint --recursive . --strict
-
   check-yamllint:
     runs-on: ubuntu-24.04
     timeout-minutes: 10
     permissions:
       contents: read
     steps:
       - name: Checkout
-        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
         with:
           persist-credentials: false
 
@@ -99,7 +78,6 @@ jobs:
     name: Accept Check CI
     needs:
       - check-reuse
-      - check-swift-format
       - check-yamllint
     runs-on: ubuntu-slim
     permissions: {}

.github/workflows/check.yml

@@ -3,5 +3,4 @@
 # SPDX-License-Identifier: Apache-2.0
 
 .DS_Store
-/.build/
-/.swiftpm/
+/build/

.github/workflows/swift.yml

@@ -0,0 +1,6 @@
+version = 1
+
+[[annotations]]
+path = "*"
+SPDX-FileCopyrightText = "2026 Kaito Udagawa <umireon@kaito.tokyo>"
+SPDX-License-Identifier = "Apache-2.0"

.gitignore

@@ -0,0 +1,7 @@
+{
+    "recommendations": [
+        "llvm-vs-code-extensions.vscode-clangd",
+        "ms-vscode.cmake-tools",
+        "vadimcn.vscode-lldb"
+    ]
+}