From 33f5e4665f961de406802f13420c66598c7b32e1 Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Tue, 17 Jan 2023 13:10:40 +0300
Subject: Add distribution_name_value::distribution()

---
 libbpkg/manifest.cxx | 19 +++++++++++++++++++
 libbpkg/manifest.hxx |  6 ++++++
 2 files changed, 25 insertions(+)

diff --git a/libbpkg/manifest.cxx b/libbpkg/manifest.cxx
index 82a11f3..637d0ae 100644
--- a/libbpkg/manifest.cxx
+++ b/libbpkg/manifest.cxx
@@ -3240,6 +3240,25 @@ namespace bpkg
     return r;
   }
 
+  // distribution_name_value
+  //
+  optional<string> distribution_name_value::
+  distribution (const string& s) const
+  {
+    size_t sn (s.size ());
+    size_t nn (name.size ());
+
+    if (nn > sn && name.compare (nn - sn, sn, s) == 0)
+    {
+      size_t p (name.find ('-'));
+
+      if (p == nn - sn)
+        return string (name, 0, p);
+    }
+
+    return nullopt;
+  }
+
   // pkg_package_manifest
   //
   static build_class_expr
diff --git a/libbpkg/manifest.hxx b/libbpkg/manifest.hxx
index 757fc92..055cb7e 100644
--- a/libbpkg/manifest.hxx
+++ b/libbpkg/manifest.hxx
@@ -1156,6 +1156,12 @@ namespace bpkg
     distribution_name_value (std::string n, std::string v)
         : name (std::move (n)),
           value (std::move (v)) {}
+
+    // Return the name's <distribution> component if the name has the
+    // specified suffix, which is assumed to be valid (-name, etc).
+    //
+    butl::optional<std::string>
+    distribution (const std::string& suffix) const;
   };
 
   class LIBBPKG_EXPORT package_manifest
-- 
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