Make javac work in a basic way

README.md

@@ -69,6 +69,7 @@ name. That seems to be the fairest way to arrange this table.
 | Go | [gofmt -e](https://golang.org/cmd/gofmt/), [go vet](https://golang.org/cmd/vet/), [golint](https://godoc.org/github.com/golang/lint), [go build](https://golang.org/cmd/go/) |
 | Haskell | [ghc](https://www.haskell.org/ghc/), [hlint](https://hackage.haskell.org/package/hlint) |
 | HTML | [HTMLHint](http://htmlhint.com/), [tidy](http://www.html-tidy.org/) |
+| Java | [javac](http://www.oracle.com/technetwork/java/javase/downloads/index.html) |
 | JavaScript | [eslint](http://eslint.org/), [jscs](http://jscs.info/), [jshint](http://jshint.com/), [flow](https://flowtype.org/), [standard](http://standardjs.com/)
 | JSON | [jsonlint](http://zaa.ch/jsonlint/) |
 | LaTeX | [chktex](http://www.nongnu.org/chktex/), [lacheck](https://www.ctan.org/pkg/lacheck) |

ale_linters/java/javac.vim

@@ -1,11 +1,19 @@
-" Author: farenjihn <farenjihn@gmail.com>
+" Author: farenjihn <farenjihn@gmail.com>, w0rp <devw0rp@gmail.com>
 " Description: Lints java files using javac
 
-let g:loaded_ale_linters_java_javac = 1
+let g:ale_java_javac_options = get(g:, 'ale_java_javac_options', '')
-let g:ale_java_javac_classpath = ''
+let g:ale_java_javac_classpath = get(g:, 'ale_java_javac_classpath', '')
 
-let s:eclipse_classpath = ''
+function! ale_linters#java#javac#GetCommand(buffer)
-let s:tmppath = '/tmp/java_ale/'
+    let l:cp_option = !empty(g:ale_java_javac_classpath)
+    \   ?  '-cp ' . g:ale_java_javac_classpath
+    \   : ''
+
+    return 'javac -Xlint '
+    \ . l:cp_option
+    \ . ' ' . g:ale_java_javac_options
+    \ . ' %t'
+endfunction
 
 function! ale_linters#java#javac#Handle(buffer, lines) abort
     " Look for lines like the following.
@@ -37,62 +45,6 @@ function! ale_linters#java#javac#Handle(buffer, lines) abort
     return l:output
 endfunction
 
-function! ale_linters#java#javac#ParseEclipseClasspath()
-    let l:eclipse_classpath = ''
-
-python << EOF
-
-    import xml.etree.ElementTree as ET, vim
-    tree = ET.parse(".classpath")
-    root = tree.getroot()
-
-    classpath = ''
-
-    for child in root:
-        classpath += child.get("path")
-        classpath += ':'
-
-        vim.command("let l:eclipse_classpath = '%s'" % classpath);
-
-# Cannot indent this EOF token as per :h python
-EOF
-
-    return l:eclipse_classpath
-endfunction
-
-function! ale_linters#java#javac#CheckEclipseClasspath()
-    " Eclipse .classpath parsing through python
-    if file_readable('.classpath')
-        let s:eclipse_classpath = ale_linters#java#javac#ParseEclipseClasspath()
-    endif
-endfunction
-
-function! ale_linters#java#javac#GetCommand(buffer)
-    let l:path = s:tmppath . expand('%:p:h')
-    let l:file = expand('%:t')
-    let l:buf = getline(1, '$')
-
-    " Javac cannot compile files from stdin so we move a copy into /tmp instead
-    call mkdir(l:path, 'p')
-    call writefile(l:buf, l:path . '/' . l:file)
-
-    return 'javac '
-    \ . '-Xlint '
-    \ . '-cp ' . s:eclipse_classpath . g:ale_java_javac_classpath . ':. '
-    \ . g:ale_java_javac_options
-    \ . ' ' . l:path . '/' . l:file
-endfunction
-
-function! ale_linters#java#javac#CleanupTmp()
-    call delete(s:tmppath, 'rf')
-endfunction
-
-augroup java_ale_au
-    autocmd! BufEnter *.java call ale_linters#java#javac#CheckEclipseClasspath()
-    autocmd! BufLeave *.java call ale_linters#java#javac#CleanupTmp()
-augroup END
-
-call ale_linters#java#javac#CheckEclipseClasspath()
 call ale#linter#Define('java', {
 \   'name': 'javac',
 \   'output_stream': 'stderr',

doc/ale.txt

@@ -38,6 +38,7 @@ CONTENTS                                                         *ale-contents*
     4.26. erlang..........................|ale-linter-options-erlang|
     4.27. phpmd...........................|ale-linter-options-phpmd|
     4.28. xo..............................|ale-linter-options-xo|
+    4.28. javac...........................|ale-linter-options-javac|
   5. Linter Integration Notes.............|ale-linter-integration|
     5.1.  merlin..........................|ale-linter-integration-ocaml-merlin|
     5.2. rust.............................|ale-integration-rust|
@@ -88,6 +89,7 @@ The following languages and tools are supported.
 * Go: 'gofmt -e', 'go vet', 'golint', 'go build'
 * Haskell: 'ghc', 'hlint'
 * HTML: 'HTMLHint', 'tidy'
+* Java: 'javac'
 * JavaScript: 'eslint', 'jscs', 'jshint', 'flow', 'xo'
 * JSON: 'jsonlint'
 * LaTeX: 'chktex', 'lacheck'
@@ -955,6 +957,24 @@ g:ale_javascript_xo_use_global             *g:ale_javascript_xo_use_global*
   global version of xo, in preference to locally installed versions of
   xo in node_modules.
 
+------------------------------------------------------------------------------
+4.28. javac                                          *ale-linter-options-javac*
+
+g:ale_java_javac_classpath                         *g:ale_java_javac_classpath*
+
+  Type: |String|
+  Default: `''`
+
+  This variable can be set to change the global classpath for Java.
+
+
+g:ale_java_javac_options                             *g:ale_java_javac_options*
+
+  Type: |String|
+  Default: `''`
+
+  This variable can be set to pass additional options to javac.
+
 ===============================================================================
 5. Linter Integration Notes                            *ale-linter-integration*