Prevent run multiply copies golangci-lint with same params

[rekby]

When I edit files Goland can save many files same time (Ctrl+S after rename refactor or after manual changes few files).

If I add golangci-lint as filewatcher with project dir param - golangci-lint start many times - once for every saved file.

I think it will good for use some lock for prevent do work multiply times. For example - create lock-file/lock-dir flag with hash of current args and env.

If lock file existed - exit with code 0.

Check lock flag for old file (for example - ignore it after a hour) - for prevent forever lock in some mistakes.

[alecthomas]

IMO this seems like an issue that is not particular to golangci-lint and should be solved in the general case by Goland.

[rekby]

IDE can't know purpose of calls - it only exec command while change file.
May be I want count changes per directory.

I see 3 variants of decision:

1. Some lock schema in linter. May be not use hash, etc. But simple param --lock and use the lock file if parameter exists only.
2. Way to run linter for file, not whole folder - for run from watcher personally for file and doesn't analyse whole dir.
3. Additinal settings in IDE for run only one watcher same time.

[sudo-suhas]

As I mentioned in the duplicate issue, the problem occurs for vscode as well.

[jirfag]

Fixed in #812