From 190fb7a0ef8a28193a89c66d9d1fd84340ff99bd Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Wed, 25 Jul 2018 12:57:03 +0200
Subject: Add package_name::{base,extension,variable}()

---
 libbpkg/package-name.cxx | 37 ++++++++++++++++++++++++++++++++++++-
 libbpkg/package-name.hxx | 16 ++++++++++++++++
 2 files changed, 52 insertions(+), 1 deletion(-)

diff --git a/libbpkg/package-name.cxx b/libbpkg/package-name.cxx
index 7a42ee3..9a3e787 100644
--- a/libbpkg/package-name.cxx
+++ b/libbpkg/package-name.cxx
@@ -7,9 +7,11 @@
 #include <string>
 #include <vector>
 #include <utility>   // move()
-#include <algorithm> // find()
+#include <iterator>  // back_inserter
+#include <algorithm> // find(), transform()
 #include <stdexcept> // invalid_argument
 
+#include <libbutl/path.mxx>    // path::traits
 #include <libbutl/utility.mxx> // alpha(), alnum()
 
 using namespace std;
@@ -56,4 +58,37 @@ namespace bpkg
 
     value_ = move (nm);
   }
+
+  string package_name::
+  base () const
+  {
+    using std::string;
+
+    size_t p (path::traits::find_extension (value_));
+    return string (value_, 0, p);
+  }
+
+  string package_name::
+  extension () const
+  {
+    using std::string;
+
+    size_t p (path::traits::find_extension (value_));
+    return p != string::npos ? string (value_, p + 1) : string ();
+  }
+
+  string package_name::
+  variable () const
+  {
+    using std::string;
+
+    auto sanitize = [] (char c)
+    {
+      return (c == '-' || c == '+' || c == '.') ? '_' : c;
+    };
+
+    string r;
+    transform (value_.begin (), value_.end (), back_inserter (r), sanitize);
+    return r;
+  }
 }
diff --git a/libbpkg/package-name.hxx b/libbpkg/package-name.hxx
index 6c7ec6c..ecc9f3b 100644
--- a/libbpkg/package-name.hxx
+++ b/libbpkg/package-name.hxx
@@ -53,6 +53,22 @@ namespace bpkg
     std::string
     string () && {std::string r; r.swap (this->value_); return r;}
 
+    // Package name base and extension (without the dot). If there is no
+    // extension, then the base name is the same as the full name and the
+    // returned extension is empty.
+    //
+    std::string
+    base () const;
+
+    std::string
+    extension () const;
+
+    // Package name sanitized to a canonical variable name. Specifically,
+    // '.', '-', and '+' are replaced with '_'.
+    //
+    std::string
+    variable () const;
+
     // Compare ignoring case. Note that a string is not checked to be a valid
     // package name.
     //
-- 
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