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| author | Boris Kolpackov <boris@codesynthesis.com> | 2016-01-30 15:44:43 +0200 |
|---|---|---|
| committer | Boris Kolpackov <boris@codesynthesis.com> | 2016-01-30 15:44:43 +0200 |
| commit | 79b1374a7fbf5476e80538215b3eb26fbc5de08c (patch) | |
| tree | fbfdd0ce317cd521d9c683d14580e39478995a15 | |
| parent | 13b9b8fbaa8c3fd3a2e459039f8f6f5b4d3560ee (diff) | |
Use pager to show usage
| -rw-r--r-- | build2/b.cxx | 35 | ||||
| -rw-r--r-- | build2/buildfile | 2 |
2 files changed, 25 insertions, 12 deletions
diff --git a/build2/b.cxx b/build2/b.cxx index 96a480a..0cfb6d8 100644 --- a/build2/b.cxx +++ b/build2/b.cxx @@ -16,6 +16,7 @@ #include <iostream> #include <system_error> +#include <butl/pager> #include <butl/filesystem> #include <build2/version> @@ -41,6 +42,7 @@ #include <build2/b-options> +using namespace butl; using namespace std; #include <build2/config/module> @@ -63,6 +65,12 @@ main (int argc, char* argv[]) cl::argv_scanner scan (argc, argv, true); options ops (scan); + // Diagnostics verbosity. + // + verb = ops.verbose_specified () + ? ops.verbose () + : ops.v () ? 2 : ops.q () ? 0 : 1; + // Version. // if (ops.version ()) @@ -78,21 +86,26 @@ main (int argc, char* argv[]) // if (ops.help ()) { - ostream& o (cout); + try + { + pager p ("b help", + verb >= 2, + ops.pager_specified () ? &ops.pager () : nullptr, + &ops.pager_option ()); - o << "Usage: " << argv[0] << " [options] [variables] [buildspec]" << endl - << "Options:" << endl; + print_b_usage (p.stream ()); - options::print_usage (o); - return 0; + // If the pager failed, assume it has issued some diagnostics. + // + return p.wait () ? 0 : 1; + } + catch (const system_error& e) + { + error << "pager failed: " << e.what (); + return 1; + } } - // Diagnostics verbosity. - // - verb = ops.verbose_specified () - ? ops.verbose () - : ops.v () ? 2 : ops.q () ? 0 : 1; - // Initialize time conversion data that is used by localtime_r(). // tzset (); diff --git a/build2/buildfile b/build2/buildfile index 412b348..9805378 100644 --- a/build2/buildfile +++ b/build2/buildfile @@ -82,7 +82,7 @@ cli.options += -I $src_root --include-with-brackets --include-prefix build2 \ # Usage options. # cli.options += --suppress-undocumented --long-usage --ansi-color \ ---page-usage 'build2::print_$name$_' --option-length 23 +--page-usage 'build2::print_$name$_' --option-length 20 # Include generated cli files into the distribution. # |