allow overriding Command builder short description with CMD_DESC variable -- close #22

README.md

@@ -252,7 +252,8 @@ you can use the `exclude_builders` key to the Environment constructor.
 env.Command(target, sources, "CMD" => command)
 # Example
 env.Command("docs.html", "docs.md",
-    "CMD" => ["pandoc", "-fmarkdown", "-thtml", "-o${_TARGET}", "${_SOURCES}"])
+    "CMD" => ["pandoc", "-fmarkdown", "-thtml", "-o${_TARGET}", "${_SOURCES}"],
+    "CMD_DESC" => "PANDOC")
 ```
 
 The command builder executes a user-defined command in order to produce the
@@ -389,6 +390,7 @@ http://rubydoc.info/github/holtrop/rscons/frames.
 - rework Preprocess builder to consider deep dependencies
 - remove ${CFLAGS} from default CPP_CMD
 - fix variable references that expand to arrays in build target sources
+- allow overriding Command builder short description with CMD_DESC variable
 
 ### v1.8.1
 

lib/rscons/builders/command.rb

@@ -25,7 +25,8 @@ module Rscons
           "_SOURCES" => sources,
         })
         command = env.build_command("${CMD}", vars)
-        standard_build("CMD #{target}", target, command, sources, env, cache)
+        cmd_desc = vars["CMD_DESC"] || "cmd_desc"
+        standard_build("#{cmd_desc} #{target}", target, command, sources, env, cache)
       end
     end
   end

spec/rscons/builders/command_spec.rb

@@ -1,16 +1,18 @@
 module Rscons
   module Builders
     describe Command do
+
       let(:command) { ['pandoc', '-fmarkdown', '-thtml', '-o${_TARGET}', '${_SOURCES}'] }
       let(:env) {Environment.new}
       subject {Command.new}
 
-
       it "invokes the command to build the target" do
         expected_cmd = ['pandoc', '-fmarkdown', '-thtml', '-ofoo.html', 'foo.md']
-        expect(subject).to receive(:standard_build).with("CMD foo.html", "foo.html", expected_cmd, ["foo.md"], env, :cache)
-        subject.run("foo.html", ["foo.md"], :cache, env, {'CMD' => command})
+        expect(subject).to receive(:standard_build).with("PANDOC foo.html", "foo.html", expected_cmd, ["foo.md"], env, :cache)
+        subject.run("foo.html", ["foo.md"], :cache, env,
+                    "CMD" => command, "CMD_DESC" => "PANDOC")
       end
+
     end
   end
 end