Add g:ale_sh_shellcheck_change_directory

ale_linters/sh/shellcheck.vim

@@ -10,6 +10,7 @@ call ale#Set('sh_shellcheck_exclusions', get(g:, 'ale_linters_sh_shellcheck_excl
 call ale#Set('sh_shellcheck_executable', 'shellcheck')
 call ale#Set('sh_shellcheck_dialect', 'auto')
 call ale#Set('sh_shellcheck_options', '')
+call ale#Set('sh_shellcheck_change_directory', 1)
 
 function! ale_linters#sh#shellcheck#GetDialectArgument(buffer) abort
     let l:shell_type = ale#handlers#sh#GetShellType(a:buffer)
@@ -40,12 +41,15 @@ function! ale_linters#sh#shellcheck#GetCommand(buffer, version) abort
     let l:exclude_option = ale#Var(a:buffer, 'sh_shellcheck_exclusions')
     let l:dialect = ale#Var(a:buffer, 'sh_shellcheck_dialect')
     let l:external_option = ale#semver#GTE(a:version, [0, 4, 0]) ? ' -x' : ''
+    let l:cd_string = ale#Var(a:buffer, 'sh_shellcheck_change_directory')
+    \   ? ale#path#BufferCdString(a:buffer)
+    \   : ''
 
     if l:dialect is# 'auto'
         let l:dialect = ale_linters#sh#shellcheck#GetDialectArgument(a:buffer)
     endif
 
-    return ale#path#BufferCdString(a:buffer)
+    return l:cd_string
     \   . '%e'
     \   . (!empty(l:dialect) ? ' -s ' . l:dialect : '')
     \   . (!empty(l:options) ? ' ' . l:options : '')

doc/ale-sh.txt

@@ -62,6 +62,18 @@ g:ale_sh_shellcheck_options                       *g:ale_sh_shellcheck_options*
 <
 
 
+g:ale_sh_shellcheck_change_directory     *g:ale_sh_shellcheck_change_directory*
+                                         *b:ale_sh_shellcheck_change_directory*
+  Type: |Number|
+  Default: `1`
+
+  If set to `1`, ALE will switch to the directory the shell file being
+  checked with `shellcheck` is in before checking it. This helps `shellcheck`
+  determine the path to sourced files more easily. This option can be turned
+  off if you want to control the directory `shellcheck` is executed from
+  yourself.
+
+
 g:ale_sh_shellcheck_dialect                       *g:ale_sh_shellcheck_dialect*
                                                   *b:ale_sh_shellcheck_dialect*
   Type: |String|

test/command_callback/test_shellcheck_command_callback.vader

@@ -14,6 +14,11 @@ After:
 Execute(The default shellcheck command should be correct):
   AssertLinter 'shellcheck', b:prefix . ale#Escape('shellcheck') . b:suffix
 
+Execute(The option disabling changing directories should work):
+  let g:ale_sh_shellcheck_change_directory = 0
+
+  AssertLinter 'shellcheck', ale#Escape('shellcheck') . b:suffix
+
 Execute(The shellcheck command should accept options):
   let b:ale_sh_shellcheck_options = '--foobar'