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expands the Go Call Expression under your cursor to check errors

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expanderr

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The expanderr (think “expander”, pronounced with a pirate accent) is a tool which expands the Go Call Expression under your cursor to check errors. As an example, assuming your cursor is positioned on this call expression:

os.Remove("/tmp/state.bin")

…invoking the expanderr will leave you with this If Statement instead:

if err := os.Remove("/tmp/state.bin"); err != nil {
	return err
}

Of course, the return values match the enclosing function signature, functions returning more than one argument are supported, and the local scope is considered to ensure that your code still compiles.

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Setup

Start by running go get -u github.com/stapelberg/expanderr. Then, follow the section for the editor you use:

Emacs

Add (load "~/go/src/github.com/stapelberg/expanderr/lisp/go-expanderr.el") to your Emacs configuration.

From now on, use C-c C-e to invoke the expanderr.

Opportunities to contribute

How does this differ from goreturns?

goreturns only inserts a return statement with zero values for the current function.

expanderr understands the signature of the call expression under your cursor and inserts the appropriate error checking statement (including a return statement). In practice, this eliminates the need of combining goreturns with an editor snippet, with the additional bonus of working correctly in a larger number of situations.

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