Updated solhint linter to be able to use a local installation (#3682)

* fix: added support for local solhint executable

* feat: added support for matching parse errors

* test: added test for solhint command callback and handler

* chore: removed command callback test

* refactor: made solhint handler structure closer to eslint

test/handler/test_solhint_handler.vader

@@ -4,7 +4,7 @@ Before:
 After:
   call ale#linter#Reset()
 
-Execute(The vint handler should parse error messages correctly):
+Execute(The solhint handler should parse linter error messages correctly):
   AssertEqual
   \ [
   \   {
@@ -50,7 +50,7 @@ Execute(The vint handler should parse error messages correctly):
   \     'type': 'E',
   \   },
   \ ],
-  \ ale_linters#solidity#solhint#Handle(bufnr(''), [
+  \ ale#handlers#solhint#Handle(bufnr(''), [
   \   'contracts/Bounty.sol: line 1, col 17, Warning - Compiler version must be fixed (compiler-fixed)',
   \   'contracts/Bounty.sol: line 4, col 8, Error - Use double quotes for string literals (quotes)',
   \   'contracts/Bounty.sol: line 5, col 8, Error - Use double quotes for string literals (quotes)',
@@ -58,3 +58,27 @@ Execute(The vint handler should parse error messages correctly):
   \   'contracts/Bounty.sol: line 14, col 3, Error - Expected indentation of 4 spaces but found 2 (indent)',
   \   'contracts/Bounty.sol: line 47, col 3, Error - Function order is incorrect, public function can not go after internal function. (func-order)',
   \ ])
+
+
+Execute(The solhint handler should parse syntax error messages correctly):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 30,
+  \     'col': 4,
+  \     'text': "missing ';' at 'uint248'",
+  \     'code': 'Parse error',
+  \     'type': 'E',
+  \   },
+  \   {
+  \     'lnum': 203,
+  \     'col': 4,
+  \     'text': "no viable alternative at input '_loserStakeMultiplier}'",
+  \     'code': 'Parse error',
+  \     'type': 'E',
+  \   },
+  \ ],
+  \ ale#handlers#solhint#Handle(bufnr(''), [
+  \   "contracts/Bounty.sol: line 30, col 4, Error - Parse error: missing ';' at 'uint248'",
+  \   "contracts/Bounty.sol: line 203, col 4, Error - Parse error: no viable alternative at input '_loserStakeMultiplier}'",
+  \ ])

test/linter/test_solhint.vader

@@ -0,0 +1,28 @@
+Before:
+  call ale#assert#SetUpLinterTest('solidity', 'solhint')
+  runtime autoload/ale/handlers/solhint.vim
+
+  let b:args = ' --formatter compact %s'
+
+After:
+  unlet! b:args
+  unlet! b:executable
+  call ale#assert#TearDownLinterTest()
+
+Execute(The default command should be correct):
+  AssertLinterCwd ''
+  AssertLinter 'solhint', ale#Escape('solhint') . b:args
+
+Execute(The options should be configurable):
+  let g:ale_solidity_solhint_options = '--foobar'
+
+  AssertLinter 'solhint', ale#Escape('solhint') . ' --foobar' . b:args
+
+
+Execute(solhint should be run from a containing project with solhint executable):
+  call ale#test#SetFilename('../test-files/solhint/Contract.sol')
+
+  let b:executable = ale#path#Simplify(g:dir . '/../test-files/solhint/node_modules/.bin/solhint')
+
+  AssertLinterCwd ale#path#Simplify(g:dir . '/../test-files/solhint')
+  AssertLinter b:executable, ale#Escape(b:executable) . b:args