4 files changed, 80 insertions, 1 deletions
diff --git a/src/utils/cpp/TARGETS b/src/utils/cpp/TARGETS
index 2089b75a..68c67be8 100644
--- a/src/utils/cpp/TARGETS
+++ b/src/utils/cpp/TARGETS
@@ -107,4 +107,10 @@
   , "deps": [["@", "gsl", "", "gsl"]]
   , "stage": ["src", "utils", "cpp"]
   }
+, "prefix":
+  { "type": ["@", "rules", "CC", "library"]
+  , "name": ["prefix"]
+  , "hdrs": ["prefix.hpp"]
+  , "stage": ["src", "utils", "cpp"]
+  }
 }
diff --git a/src/utils/cpp/prefix.hpp b/src/utils/cpp/prefix.hpp
new file mode 100644
index 00000000..604e8226
--- /dev/null
+++ b/src/utils/cpp/prefix.hpp
@@ -0,0 +1,33 @@
+// Copyright 2024 Huawei Cloud Computing Technology Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef INCLUDED_SRC_UTILS_CPP_PREFIX_HPP
+#define INCLUDED_SRC_UTILS_CPP_PREFIX_HPP
+
+#include <algorithm>
+#include <sstream>
+#include <string>
+
+[[nodiscard]] static inline auto PrefixLines(const std::string& text,
+                                             const std::string& prefix = "  ")
+    -> std::string {
+    std::stringstream out{};
+    std::istringstream in{text};
+    for (std::string line{}; std::getline(in, line);) {
+        out << prefix << line << "\n";
+    }
+    return out.str();
+}
+
+#endif
diff --git a/test/utils/cpp/TARGETS b/test/utils/cpp/TARGETS
index 702172b4..5d7809c4 100644
--- a/test/utils/cpp/TARGETS
+++ b/test/utils/cpp/TARGETS
@@ -23,6 +23,20 @@
   , "stage": ["test", "utils", "cpp"]
   , "private-ldflags": ["-pthread"]
   }
+, "prefix":
+  { "type": ["@", "rules", "CC/test", "test"]
+  , "name": ["prefix"]
+  , "srcs": ["prefix.test.cpp"]
+  , "private-deps":
+    [ ["@", "catch2", "", "catch2"]
+    , ["", "catch-main"]
+    , ["@", "src", "src/utils/cpp", "prefix"]
+    ]
+  , "stage": ["test", "utils", "cpp"]
+  }
 , "TESTS":
-  {"type": "install", "tainted": ["test"], "deps": ["path", "file_locking"]}
+  { "type": "install"
+  , "tainted": ["test"]
+  , "deps": ["path", "file_locking", "prefix"]
+  }
 }
diff --git a/test/utils/cpp/prefix.test.cpp b/test/utils/cpp/prefix.test.cpp
new file mode 100644
index 00000000..3dd092eb
--- /dev/null
+++ b/test/utils/cpp/prefix.test.cpp
@@ -0,0 +1,26 @@
+// Copyright 2024 Huawei Cloud Computing Technology Co., Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <filesystem>
+
+#include "catch2/catch_test_macros.hpp"
+#include "src/utils/cpp/prefix.hpp"
+
+TEST_CASE("lines", "[prefix]") {
+    CHECK(PrefixLines("").empty());
+    CHECK(PrefixLines("foo\nbar\n") == "  foo\n  bar\n");
+    CHECK(PrefixLines("foo\nbar\n", ">") == ">foo\n>bar\n");
+    CHECK(PrefixLines("foo") == "  foo\n");
+    CHECK(PrefixLines("foo\nbar") == "  foo\n  bar\n");
+}