From c18a8d2d43f22ccf0b21461b1f0d3395d4e50c1f Mon Sep 17 00:00:00 2001
From: Karen Arutyunov <karen@codesynthesis.com>
Date: Mon, 24 Jul 2017 14:45:54 +0300
Subject: Change dir_path/string concatenation semantics

---
 build2/functions-path.cxx | 22 ++++++--------
 tests/value/buildfile     |  2 +-
 tests/value/concat.test   | 73 +++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 82 insertions(+), 15 deletions(-)
 create mode 100644 tests/value/concat.test

diff --git a/build2/functions-path.cxx b/build2/functions-path.cxx
index 81cd01f..4542858 100644
--- a/build2/functions-path.cxx
+++ b/build2/functions-path.cxx
@@ -48,23 +48,17 @@ namespace build2
   concat_dir_path_string (dir_path l, string sr)
   {
     if (path::traits::is_separator (sr[0])) // '\0' if empty.
-    {
       sr.erase (0, 1);
-      path pr (move (sr));
-      pr.canonicalize (); // Convert to canonical directory separators.
 
-      // If RHS is syntactically a directory (ends with a trailing slash),
-      // then return it as dir_path, not path.
-      //
-      if (pr.to_directory () || pr.empty ())
-        l /= path_cast<dir_path> (move (pr));
-      else
-        return value (path_cast<path> (move (l)) /= pr);
-    }
-    else
-      l += sr;
+    path pr (move (sr));
+    pr.canonicalize (); // Convert to canonical directory separators.
 
-    return value (move (l));
+    // If RHS is syntactically a directory (ends with a trailing slash), then
+    // return it as dir_path, not path.
+    //
+    return pr.to_directory () || pr.empty ()
+      ? value (move (l /= path_cast<dir_path> (move (pr))))
+      : value (path_cast<path> (move (l)) /= pr);
   }
 
   void
diff --git a/tests/value/buildfile b/tests/value/buildfile
index ce246a4..ac45282 100644
--- a/tests/value/buildfile
+++ b/tests/value/buildfile
@@ -2,4 +2,4 @@
 # copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
 # license   : MIT; see accompanying LICENSE file
 
-./: test{*}
+./: test{*} $b
diff --git a/tests/value/concat.test b/tests/value/concat.test
new file mode 100644
index 0000000..8cf6e38
--- /dev/null
+++ b/tests/value/concat.test
@@ -0,0 +1,73 @@
+# file      : tests/value/concat.test
+# copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+# license   : MIT; see accompanying LICENSE file
+
+.include ../common.test
+
+: dir_path
+:
+{
+  : name
+  :
+  $* <<EOI >>/EOO
+  d = [dir_path] foo
+  f = bar
+  print $d/$f
+  EOI
+  foo/bar
+  EOO
+
+  : string
+  :
+  $* <<EOI >>/EOO
+  d = [dir_path] foo
+  f = [string] bar
+  print $d/$f
+  EOI
+  foo/bar
+  EOO
+
+  : leading-separator
+  :
+  $* <<EOI >>/EOO
+  d = [dir_path] foo
+  f = /bar
+  print $d/$f
+  EOI
+  foo/bar
+  EOO
+
+  : not-separated
+  :
+  $* <<EOI >>/EOO
+  d = [dir_path] foo
+  f = bar
+  print $d$f
+  EOI
+  foo/bar
+  EOO
+}
+
+: path
+:
+{
+  : separated
+  :
+  $* <<EOI >>/EOO
+  d = [path] foo
+  f = bar
+  print $d/$f
+  EOI
+  foo/bar
+  EOO
+
+  : not-separated
+  :
+  $* <<EOI >>/EOO
+  d = [path] foo
+  f = bar
+  print $d$f
+  EOI
+  foobar
+  EOO
+}
-- 
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