Allows the user to override $GO111MODULE environment variable through
ale options. This gives control over the default behavior of Go module
resolution.
Golang documentation:
https://github.com/golang/go/wiki/Modules#how-to-use-modules
Add `ale#Go#EnvString()` function to make it easy to add similar Go
environment variables in the future.
Use the new `EnvString` function in all available Go tools callbacks
& update tests
Also add test of linter command callback for `gofmt`
* Added filename keys to gobuild and gometalinter
* Removed skipping files not in current package
* Removed `--include` for gometalinter
* Fixed the tests
The real fix was not using absolute paths anymore (so not expanding with the `:p` option). The regex was correct and should at least include the `^` character to make sure the string starts with the given path/filename and not references the path/filename in some error description.
* Improve performance when using gometalinter
Before this change when I opened a big project that had 6000+ warnings/errors it took ages to get the actual warnings/errors and it caused my CPU to be busy for quite some time. The call to gometalinter alone took about 24 seconds, but after that vim was struggling as well.
After this change the gometalinter call just takes 2 seconds and nothing noticable happens with the CPU and/or vim.
* Removed obsolete test
This logic is no longer done by the `ale` plugin, but by `gometalinter` itself.
Linter is disabled by default (see g:ale_go_gometalinter_enabled) as it
conflicts with a number of established ALE linters (golint, govet,
gosimple, staticcheck, etc).
