diff options
Diffstat (limited to 'libbuild2/script/run.cxx')
| -rw-r--r-- | libbuild2/script/run.cxx | 43 |
1 files changed, 32 insertions, 11 deletions
diff --git a/libbuild2/script/run.cxx b/libbuild2/script/run.cxx index b90ba48..8c71b32 100644 --- a/libbuild2/script/run.cxx +++ b/libbuild2/script/run.cxx @@ -321,23 +321,44 @@ namespace build2 path dp ("diff"); process_path pp (run_search (dp, true)); - cstrings args {pp.recall_string ()}; - - // If both files being compared won't be available on failure, then - // instruct diff not to print the file paths. It seems that the only - // way to achieve this is to abandon the output unified format in the - // favor of the minimal output, which normally is still informative - // enough for the troubleshooting (contains the difference line - // numbers, etc). - // - if (avail_on_failure (eop, env) || avail_on_failure (op, env)) - args.push_back ("-u"); + cstrings args {pp.recall_string (), "-u"}; // Ignore Windows newline fluff if that's what we are running on. // if (env.host.class_ == "windows") args.push_back ("--strip-trailing-cr"); + // Instruct diff not to print the file paths that won't be available + // on failure. + // + // It seems that the only portable way to achieve this is to abandon + // the output unified format in the favor of the minimal output. + // However, the FreeBSD's, OpenBSD's and GNU's (used on Linux, MacOS, + // Windows, and NetBSD) diff utilities support the -L option that + // allows to replace the compared file path(s) with custom string(s) + // in the utility output. We will use this option for both files if + // any of them won't be available on failure (note that we can't + // assign a label only for the second file). + // + // Add the -L option using the file name as its value if it won't be + // available on failure and its full path otherwise. + // + auto add_label = [&args, &env] (const path& p) + { + const char* s (p.string ().c_str ()); + + args.push_back ("-L"); + args.push_back (avail_on_failure (p, env) + ? s + : path::traits_type::find_leaf (s)); + }; + + if (!avail_on_failure (eop, env) || !avail_on_failure (op, env)) + { + add_label (eop); + add_label (op); + } + args.push_back (eop.string ().c_str ()); args.push_back (op.string ().c_str ()); args.push_back (nullptr); |