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@@ -8,7 +8,13 @@ class SCM::Git::Config < SCM::Git::CommandProxyBase
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   def []=(*params)
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     value = params.pop
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     scope, key = process_keys(params)
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-    base.command(*(["config"] + config_args(scope) + [key, value]))
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+    args = ["config"] + config_args(scope)
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+    if value
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+      args += [key, value]
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+    else
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+      args += ["--unset", key]
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+    end
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+    base.command(*args)
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   end
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   protected

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@@ -32,6 +32,10 @@ describe SCM::Git do
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     Git.commands_ran.first.should == ["config", "--file", "/base/.git/config", "remote.origin.url", "../origin"]
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   end
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+  it "should delete local values when assigning nil" do
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+    @git.config[:local, "git-tmbundle.log.limit"] = nil
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+    Git.commands_ran.first.should == ["config", "--file", "/base/.git/config", "--unset", "git-tmbundle.log.limit"]
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+  end
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   it "should allow reading global values" do
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     Git.command_response["config", "--global", "remote.origin.url"] = "../origin"