Add --{repositories|packages}-file options to bpkg-rep-info

This allows saving both manifests with a single invocation (which is the
only way to guarantee they are consistent).

3 files changed, 90 insertions, 16 deletions

diff --git a/bpkg/buildfile b/bpkg/buildfile
index 5c3ba35..44c04ff 100644
--- a/bpkg/buildfile
+++ b/bpkg/buildfile
@@ -122,7 +122,7 @@ if $cli.configured
 --cli-namespace bpkg::cli --generate-vector-scanner --generate-file-scanner \
 --generate-group-scanner --keep-separator --generate-specifier \
 --generate-parse --page-usage 'bpkg::print_$name$_' --ansi-color \
---include-base-last --option-length 23
+--include-base-last --option-length 24
 
   cli.cxx{common-options}: cli.options += --short-usage --long-usage # Both.
   cli.cxx{bpkg-options}: cli.options += --short-usage --suppress-undocumented
diff --git a/bpkg/rep-info.cli b/bpkg/rep-info.cli
index 6ce1953..16f83d6 100644
--- a/bpkg/rep-info.cli
+++ b/bpkg/rep-info.cli
@@ -88,9 +88,24 @@ namespace bpkg
     bool --manifest
     {
       "Instead of printing the information in the human-readable form, dump it
-       as manifest(s). Normally you would use this option in combination with
-       \cb{--packages|-p} or \cb{--repositories|-r} to only dump one of the
-       manifests."
+       (to \cb{stdout}) as manifest(s). Normally you would use this option in
+       combination with \cb{--packages|-p} or \cb{--repositories|-r} to only
+       dump one of the manifests. See also \cb{--repositories-file} and
+       \cb{--packages-file}."
+    }
+
+    path --repositories-file
+    {
+      "<path>",
+      "If \cb{--manifest} is specified, then save the repositories manifest
+       to the specified file instead of dumping it to \cb{stdout}."
+    }
+
+    path --packages-file
+    {
+      "<path>",
+      "If \cb{--manifest} is specified, then save the packages manifest to the
+       specified file instead of dumping it to \cb{stdout}."
     }
 
     repository_type --type
diff --git a/bpkg/rep-info.cxx b/bpkg/rep-info.cxx
index b551084..35b06ca 100644
--- a/bpkg/rep-info.cxx
+++ b/bpkg/rep-info.cxx
@@ -33,6 +33,14 @@ namespace bpkg
       fail << "repository location argument expected" <<
         info << "run 'bpkg help rep-info' for more information";
 
+    if ((o.repositories_file_specified () || o.packages_file_specified ()) &&
+        !o.manifest ())
+      fail << (o.repositories_file_specified ()
+               ? "--repositories-file"
+               : "--packages-file")
+           << " specified without --manifest" <<
+        info << "run 'bpkg help rep-info' for more information";
+
     repository_location rl (
       parse_location (args.next (),
                       o.type_specified ()
@@ -175,14 +183,38 @@ namespace bpkg
           rms.push_back (
             find_base_repository (rfd.fragments.back ().repositories));
 
-          // Note: serializing without any extra repository_manifests info.
-          //
-          manifest_serializer s (cout, "stdout");
+          auto serialize = [&rms] (ostream& os, const string& name)
+          {
+            // Note: serializing without any extra repository_manifests info.
+            //
+            manifest_serializer s (os, name);
 
-          for (const repository_manifest& rm: rms)
-            rm.serialize (s);
+            for (const repository_manifest& rm: rms)
+              rm.serialize (s);
+
+            s.next ("", ""); // End of stream.
+          };
+
+          if (o.repositories_file_specified ())
+          {
+            const path& p (o.repositories_file ());
 
-          s.next ("", ""); // End of stream.
+            try
+            {
+              // Let's set the binary mode not to litter the manifest file
+              // with the carriage return characters on Windows.
+              //
+              ofdstream ofs (p, ios::binary);
+              serialize (ofs, p.string ());
+              ofs.close ();
+            }
+            catch (const io_error& e)
+            {
+              fail << "unable to write to " << p << ": " << e;
+            }
+          }
+          else
+            serialize (cout, "stdout");
         }
         else
         {
@@ -266,12 +298,39 @@ namespace bpkg
             }
           }
 
-          // Note: serializing without any extra package_manifests info.
-          //
-          manifest_serializer s (cout, "stdout");
-          for (const package_manifest& pm: pms)
-            pm.serialize (s);
-          s.next ("", ""); // End of stream.
+          auto serialize = [&pms] (ostream& os, const string& name)
+          {
+            // Note: serializing without any extra package_manifests info.
+            //
+            manifest_serializer s (os, name);
+
+            for (const package_manifest& pm: pms)
+              pm.serialize (s);
+
+            s.next ("", ""); // End of stream.
+          };
+
+          if (o.packages_file_specified ())
+          {
+            const path& p (o.packages_file ());
+
+            try
+            {
+              // Let's set the binary mode not to litter the manifest file
+              // with the carriage return characters on Windows.
+              //
+              ofdstream ofs (p, ios::binary);
+              serialize (ofs, p.string ());
+              ofs.close ();
+            }
+            catch (const io_error& e)
+            {
+              fail << "unable to write to " << p << ": " << e;
+            }
+          }
+          else
+            serialize (cout, "stdout");
+
         }
         else
         {