Build/vet/lint on demand, perf improvements, run benchmarks and more

• New commands

  • Frederik Ring (@m90)
    • Go: Run on Go Playground to run the current file (only if all its dependencies are from the std library) in the Go Playground using goplay. PR 1270. Feature Request #1211
      • Use the setting go.playground to control whether to run and/or share a link to the playground and/or open the playground in the browser.
  • Robin Bartholdson @buyology
    • Go: Benchmark Function At Cursor and Codelens for running benchmarks in test files. PR 1303. Feature Request #972
  • Andrew Nee (@ndrewnee)
    • Go: Lint Current Package and Go: Lint Workpsace to lint using the tool specified in the go.lintTool setting and the flags specified in the go.lintFlags setting. PR 1258. Feature Request #1041
  • Ramya Rao (@ramya-rao-a)
    • Go: Vet Current Package and Go: Vet Workpsace to vet using the flags specified in the go.vetFlags setting. Feature Request #1041
    • Go: Build Current Package and Go: Build Workpsace to build using the flags specified in the go.buildFlags setting and build tags specified in the setting go.buildTags. Feature Request #287
    • Go: Install Current Package to install the current package using the flags specified in the go.buildFlags setting and build tags specified in the setting go.buildTags. Feature Request #287

• Completion Improvements

  • wangkechun (@wangkechun)
    • Completions for standard packages are now shown before custom packages when providing completions for unimported packages. PR 1309
  • Ramya Rao (@ramya-rao-a)
    • gocode can now use gb specific rules when providing completions. Set the new setting go.gocodePackageLookupMode to gb to use this feature. Feature Request #547

• Performance improvements

  • Ramya Rao (@ramya-rao-a)
    • The autobuild feature of gocode which is known to slow completions is now disabled by default. Fixes Bug 1323
      • Since we use the -i flag when building, we do not rely on autobuild feature of gocode to ensure fresh results from dependencies.
      • If you have disabled the buildOnSave setting, then use the new Go: Build Current Package command once in a while to ensure the dependencies are up to date or enable the go.gocodeAutoBuild setting.
    • In Go 1.9 and higher, running the vet feature in the absence of vet flags will be faster due to the use of go vet ./... instead of go tool vet -flags. Fixes Bug 1215
    • Performance issues caused by a large number of lingering processes for vet/lint/hover features are now solved.
      • Measures are now in place to kill older processes before starting new ones for vet/lint feature. Fixes Bug 1265
      • For other features like hover/outline/definition etc. the cancellation token provided by the core is used to kill processes if the corresponding request from the core is cancelled. Fixes Bug 667

• Others

  • Phil Kates (@philk)
    • Fix the formatting issue due to stricter rules in the VS Code apis around configuration objects. PR 1334. Fixes Bug 1333.
  • David Marby (@DMarby)
    • Fix delve connection issues when verbose build flag is set. PR 1354
  • Jan Koehnlein @JanKoehnlein
    • Fix Open Workspace Settings action in the prompt to set GOPATH. PR 1375. Fixes Bug 1374
  • Ramya Rao (@ramya-rao-a)
    • Apply/Clear coverage in active editors of all editor groups rather than just the first one. Fixes Bug 1343
    • Fix the issue of codelens for references showing "0 references" when guru fails to provide references. Fixes Bug 1336
    • Support multiple buildtags in the go.buildTags setting. Fixes [Bug 1355]#1355).