expanderr
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.
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.