Add utility function for prefixing each line of a string

... and thus allowing proper quoting of command output.

2 files changed, 39 insertions, 0 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