Close #1476 - Make the javac executable configurable

ale_linters/java/javac.vim

@@ -3,8 +3,9 @@
 
 let s:classpath_sep = has('unix') ? ':' : ';'
 
-let g:ale_java_javac_options = get(g:, 'ale_java_javac_options', '')
-let g:ale_java_javac_classpath = get(g:, 'ale_java_javac_classpath', '')
+call ale#Set('java_javac_executable', 'javac')
+call ale#Set('java_javac_options', '')
+call ale#Set('java_javac_classpath', '')
 
 function! ale_linters#java#javac#GetImportPaths(buffer) abort
     let l:pom_path = ale#path#FindNearestFile(a:buffer, 'pom.xml')
@@ -35,6 +36,10 @@ function! s:BuildClassPathOption(buffer, import_paths) abort
     \   : ''
 endfunction
 
+function! ale_linters#java#javac#GetExecutable(buffer) abort
+    return ale#Var(a:buffer, 'java_javac_executable')
+endfunction
+
 function! ale_linters#java#javac#GetCommand(buffer, import_paths) abort
     let l:cp_option = s:BuildClassPathOption(a:buffer, a:import_paths)
     let l:sp_option = ''
@@ -72,11 +77,13 @@ function! ale_linters#java#javac#GetCommand(buffer, import_paths) abort
 
     " Create .class files in a temporary directory, which we will delete later.
     let l:class_file_directory = ale#engine#CreateDirectory(a:buffer)
+    let l:executable = ale_linters#java#javac#GetExecutable(a:buffer)
 
     " Always run javac from the directory the file is in, so we can resolve
     " relative paths correctly.
     return ale#path#BufferCdString(a:buffer)
-    \ . 'javac -Xlint'
+    \ . ale#Escape(l:executable)
+    \ . ' -Xlint'
     \ . ' ' . l:cp_option
     \ . ' ' . l:sp_option
     \ . ' -d ' . ale#Escape(l:class_file_directory)
@@ -119,7 +126,7 @@ endfunction
 
 call ale#linter#Define('java', {
 \   'name': 'javac',
-\   'executable': 'javac',
+\   'executable_callback': 'ale_linters#java#javac#GetExecutable',
 \   'command_chain': [
 \       {'callback': 'ale_linters#java#javac#GetImportPaths', 'output_stream': 'stdout'},
 \       {'callback': 'ale_linters#java#javac#GetCommand', 'output_stream': 'stderr'},

doc/ale-java.txt

@@ -25,6 +25,14 @@ g:ale_java_javac_classpath                         *g:ale_java_javac_classpath*
   This variable can be set to change the global classpath for Java.
 
 
+g:ale_java_javac_executable                       *g:ale_java_javac_executable*
+                                                  *b:ale_java_javac_executable*
+  Type: |String|
+  Default: `'javac'`
+
+  This variable can be set to change the executable path used for javac.
+
+
 g:ale_java_javac_options                             *g:ale_java_javac_options*
                                                      *b:ale_java_javac_options*
   Type: |String|

test/command_callback/test_javac_command_callback.vader

@@ -1,9 +1,11 @@
 Before:
   call ale#test#SetDirectory('/testplugin/test/command_callback')
 
+  Save g:ale_java_javac_executable
   Save g:ale_java_javac_options
   Save g:ale_java_javac_classpath
 
+  unlet! g:ale_java_javac_executable
   unlet! g:ale_java_javac_options
   unlet! g:ale_java_javac_classpath
 
@@ -28,7 +30,8 @@ Before:
 
   call ale#test#SetFilename('dummy.java')
 
-  let g:prefix = 'cd ' . ale#Escape(expand('%:p:h')) . ' && javac -Xlint'
+  let g:prefix = 'cd ' . ale#Escape(expand('%:p:h'))  . ' && '
+  \ . ale#Escape('javac') . ' -Xlint'
 
 After:
   call ale#test#RestoreDirectory()
@@ -57,6 +60,17 @@ Execute(The javac callback should use g:ale_java_javac_classpath correctly):
   \   . ' -d TEMP %t',
   \ GetCommand([])
 
+Execute(The executable should be configurable):
+  let g:ale_java_javac_executable = 'foobar'
+
+  AssertEqual 'foobar', ale_linters#java#javac#GetExecutable(bufnr(''))
+
+  AssertEqual
+  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && '
+  \ . ale#Escape('foobar') . ' -Xlint'
+  \ . ' -d TEMP %t',
+  \ GetCommand([])
+
 Execute(The javac callback should include discovered classpaths):
   AssertEqual
   \ g:prefix
@@ -120,7 +134,7 @@ Execute(The javac callback should detect source directories):
   call ale#engine#InitBufferInfo(bufnr(''))
 
   AssertEqual
-  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && javac -Xlint'
+  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && ' . ale#Escape('javac') . ' -Xlint'
   \   . ' -sourcepath ' . ale#Escape(
   \     ale#path#Simplify(g:dir . '/java_paths/src/main/java/')
   \   )
@@ -133,7 +147,7 @@ Execute(The javac callback should combine detected source directories and classp
   call ale#engine#InitBufferInfo(bufnr(''))
 
   AssertEqual
-  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && javac -Xlint'
+  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && ' . ale#Escape('javac') . ' -Xlint'
   \   . ' -cp ' . ale#Escape(join(['/foo/bar.jar', '/xyz/abc.jar'], g:cp_sep))
   \   . ' -sourcepath ' . ale#Escape(
   \     ale#path#Simplify(g:dir . '/java_paths/src/main/java/')
@@ -164,7 +178,7 @@ Execute(The javac callback should include src/test/java for test paths):
   call ale#engine#InitBufferInfo(bufnr(''))
 
   AssertEqual
-  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && javac -Xlint'
+  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && ' . ale#Escape('javac') . ' -Xlint'
   \   . ' -sourcepath ' . ale#Escape(join([
   \     ale#path#Simplify(g:dir . '/java_paths/src/main/java/'),
   \     ale#path#Simplify(g:dir . '/java_paths/src/test/java/'),
@@ -178,7 +192,7 @@ Execute(The javac callback should include src/main/jaxb when available):
   call ale#engine#InitBufferInfo(bufnr(''))
 
   AssertEqual
-  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && javac -Xlint'
+  \ 'cd ' . ale#Escape(expand('%:p:h')) . ' && ' . ale#Escape('javac') . ' -Xlint'
   \   . ' -sourcepath ' . ale#Escape(join([
   \     ale#path#Simplify(g:dir . '/java_paths_with_jaxb/src/main/java/'),
   \     ale#path#Simplify(g:dir . '/java_paths_with_jaxb/src/main/jaxb/'),