Add support for Pod based SwiftLint (#2122)

It's common to add SwiftLint as a CocoaPod dependency, instead of as a global
binary. In this case we should use that version of SwiftLint before looking
for any others. Note that I'm also adding support for SwiftLint in ReactNative
projects here as well, where the Pods directory would be nested inside an ios
directory.

1 files changed, 25 insertions, 7 deletions

diff --git a/ale_linters/swift/swiftlint.vim b/ale_linters/swift/swiftlint.vim
index 697d246b..a1150658 100644
--- a/ale_linters/swift/swiftlint.vim
+++ b/ale_linters/swift/swiftlint.vim
@@ -1,6 +1,24 @@
-" Author: David Mohundro <david@mohundro.com>
+" Author: David Mohundro <david@mohundro.com>, Gordon Fontenot <gordon@fonten.io>
 " Description: swiftlint for swift files
 
+call ale#Set('swift_swiftlint_executable', 'swiftlint')
+call ale#Set('swift_swiftlint_use_global', get(g:, 'ale_use_global_executables', 0))
+
+function! ale_linters#swift#swiftlint#GetExecutable(buffer) abort
+    return ale#node#FindExecutable(a:buffer, 'swift_swiftlint', [
+          \ 'Pods/SwiftLint/swiftlint',
+          \ 'ios/Pods/SwiftLint/swiftlint',
+          \ 'swiftlint',
+          \])
+endfunction
+
+function! ale_linters#swift#swiftlint#GetCommand(buffer) abort
+    let l:executable = ale_linters#swift#swiftlint#GetExecutable(a:buffer)
+    let l:args = 'lint --use-stdin'
+
+    return ale#Escape(l:executable)
+          \ . ' ' .l:args
+endfunction
 
 function! ale_linters#swift#swiftlint#Handle(buffer, lines) abort
     let l:pattern = '\v^([a-zA-Z]?:?[^:]+):(\d+):(\d+)?:? ([^:]+): (.+)$'
@@ -8,10 +26,10 @@ function! ale_linters#swift#swiftlint#Handle(buffer, lines) abort
 
     for l:match in ale#util#GetMatches(a:lines, l:pattern)
         let l:item = {
-        \   'lnum': str2nr(l:match[2]),
-        \   'type': l:match[4] is# 'error' ? 'E' : 'W',
-        \   'text': l:match[5],
-        \}
+              \ 'lnum': str2nr(l:match[2]),
+              \ 'type': l:match[4] is# 'error' ? 'E' : 'W',
+              \ 'text': l:match[5],
+              \}
 
         if l:match[4] is# 'error'
             let l:item.type = 'E'
@@ -45,7 +63,7 @@ endfunction
 
 call ale#linter#Define('swift', {
 \   'name': 'swiftlint',
-\   'executable': 'swiftlint',
-\   'command': 'swiftlint lint --use-stdin',
+\   'executable_callback': 'ale_linters#swift#swiftlint#GetExecutable',
+\   'command_callback': 'ale_linters#swift#swiftlint#GetCommand',
 \   'callback': 'ale_linters#swift#swiftlint#Handle',
 \})