only clang-format-18 is required, it would be faster like bellow(22.04 jammy for example)

          wget https://apt.llvm.org/llvm-snapshot.gpg.key
          sudo gpg --dearmor < llvm-snapshot.gpg.key > /usr/share/keyrings/llvm-archive-keyring.gpg
          echo "deb [signed-by=/usr/share/keyrings/llvm-archive-keyring.gpg] http://apt.llvm.org/jammy/ llvm-toolchain-jammy-18 main" | sudo tee /etc/apt/sources.list.d/llvm-toolchain-jammy-18.list
          sudo apt-get update
          sudo apt-get install -y clang-format-18
          sudo ln -sf /usr/bin/clang-format-18 /usr/local/bin/clang-format
          clang-format --version

Yeah, in the initial draft I want to install clang-format package too.

The current lint time 27s in one task[1] which is faster enough for us, IMO.

The current script is robust and maitained by LLVM team which support all debian derivation distributions and all clang version.

1. https://github.com/Bambooin/librime/actions/runs/16234549398/job/45842887260

安裝步驟也太複雜了。
個人開發者如何能做到與 CI 環境同步呢？

畢竟只是個輔助性的開發工具，我覺得沒必要做複雜的優化。
最好用默認的，大家都普遍裝備的版本。
有沒有一條命令（apt install？），能安裝該軟件的默認版本？

The current clang-format 18 and 19 on Ubunut 24.04 has issue with GitHub runner image.

The lint failed with weird error on [1] with clang-format-18 and on [2] with clang-format-19.

On my local machine box with openSUSE, both clang-format 18 and 19 are fine.

The clang-format 18 and 19 on both llvm, openSUSE and latest Ubuntu image with Podman are fine.

If we want use apt install clang-format, part of rolling updated distribution will install clang-format-20.

We need to fix one format style with clang-format-20 which will break old distribution with older clang-format.

So I picked the llvm apt at final, fix for the weird clang format error under GitHub runner iamge are welcome.

1. https://github.com/Bambooin/librime/actions/runs/16232976340/job/45838997180
2. https://github.com/Bambooin/librime/actions/runs/16233132706/job/45839368372

Only one style violation on clang-format-20 under openSUSE.

index 85cac5ce..5137d77c 100644
--- a/src/rime/dict/corrector.cc
+++ b/src/rime/dict/corrector.cc
@@ -207,9 +207,10 @@ Distance EditDistanceCorrector::RestrictedDistance(const std::string& s1,
   for (size_t i = 1; i <= len1; ++i) {
     auto min_d = threshold + 1;
     for (size_t j = 1; j <= len2; ++j) {
-      d[index(i, j)] = (std::min)(
-          {d[index(i - 1, j)] + 2, d[index(i, j - 1)] + 2,
-           d[index(i - 1, j - 1)] + SubstCost(s1[i - 1], s2[j - 1])});
+      d[index(i, j)] =
+          (std::min)({d[index(i - 1, j)] + 2, d[index(i, j - 1)] + 2,
+                      d[index(i - 1, j - 1)] +
+                          SubstCost(s1[i - 1], s2[j - 1])});
       if (i > 1 && j > 1 && s1[i - 2] == s2[j - 1] && s1[i - 1] == s2[j - 2]) {
         d[index(i, j)] = (std::min)(d[index(i, j)], d[index(i - 2, j - 2)] + 2);
       }```