file logging: shorten continuation prefix

While on the console, we want multi-line logs nicely aligned, when
logging to a file, unique readability is enough. So we can fix the
continuation prefix to a fixed string (with non-overlapping initial
segment). This makes log files easier to scan and also avoids
very long lines, given that the more complete message prefixes
are very long.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/buildtool/logging/log_sink_file.hpp b/src/buildtool/logging/log_sink_file.hpp
index e731a0c1..593b07e0 100644
--- a/src/buildtool/logging/log_sink_file.hpp
+++ b/src/buildtool/logging/log_sink_file.hpp
@@ -105,7 +105,7 @@ class LogSinkFile final : public ILogSink {
             prefix = fmt::format("{} ({})", prefix, logger->Name());
         }
         prefix = fmt::format("{}:", prefix);
-        auto cont_prefix = std::string(prefix.size(), ' ');
+        const auto* cont_prefix = "  ";
 
         {
             std::lock_guard lock{FileMutexes().Get(file_path_)};