bug/feature_request(coffeelint): allow 1 tab indentation

[Kristinita]

1. Summary

I want to use 1 tab indentation in my CoffeeScript files, but coffeelint.json schema check that it’s non-valid. It would be nice if the schema will support indentation with 1 tab.

2. MCVE

2.1. Files

KiraCoffee.coffee with 1 tab indentation:

kira = (goddess) ->
	console.log goddess

coffeelint.json:

{
	"indentation": {
		"value": 1
	},
	"no_spaces": {
		"level": "error"
	},
	"no_tabs": {
		"level": "ignore"
	}
}

As CoffeeLint documentation said:

1. no_spaces — “This rule forbids spaces in indentation. It is disabled by default.”
2. no_tabs — “This rule forbids tabs in indentation. Enough said. It is enabled by default.”

I have to use both options for using tabs in my .coffee files.

2.2. CoffeeLint command

D:\SashaDebugging\KiraCoffeelintSchema>coffeelint KiraCoffee.coffee
  ✓ KiraCoffee.coffee

✓ Ok! » 0 errors and 0 warnings in 1 file

I can’t remove the indentation key from coffeelint.json. If:

{
-	"indentation": {
-		"value": 1
-	},
	"no_spaces": {
		"level": "error"
	},
	"no_tabs": {
		"level": "ignore"
	}
}

I get the error:

D:\SashaDebugging\KiraCoffeelintSchema>coffeelint KiraCoffee.coffee
  ✗ KiraCoffee.coffee
     ✗ #2-2: Line contains inconsistent indentation. (indentation) Expected 2 got 1.

✗ Lint! » 1 error and 0 warnings in 1 file

2.3. v8r command

I validate my coffeelint.json via v8r:

D:\SashaDebugging\KiraCoffeelintSchema>v8r coffeelint.json
ℹ No config file found
ℹ Processing .\coffeelint.json
ℹ Found schema in https://www.schemastore.org/api/json/catalog.json …
ℹ Validating .\coffeelint.json against schema from https://json.schemastore.org/coffeelint.json …
✖ .\coffeelint.json is invalid

.\coffeelint.json#/indentation/value must be equal to one of the allowed values

"indentation": {"value": 1}, isn’t valid in the current version of coffeelint.json. According to coffeelint.json schema, available values is 2 and 4.

3. Desired behavior

Indentation with 1 tab is standard for programming languages. I can’t find that CoffeeScript and/or CoffeeLint disallow it. I think it would be nice if coffeelint.json schema will support this behavior:

1. If user use indentation with tabs ("no_spaces": {"level": "error"}, "no_tabs": {"level": "ignore"}), available values for the indentation key will be 1 and 2. I don’t think that indentation with 4 tabs is good.
2. Else user use indentation with spaces ("no_spaces": {"level": "ignore"}, "no_tabs": {"level": "error"}), available values for the indentation key will be 2 and 4 as now. I don’t think that indentation with 1 space is good.

Thanks.