1 files changed, 130 insertions, 0 deletions
diff --git a/ale_linters/java/eclipselsp.vim b/ale_linters/java/eclipselsp.vim
new file mode 100644
index 00000000..af9a325e
--- /dev/null
+++ b/ale_linters/java/eclipselsp.vim
@@ -0,0 +1,130 @@
+" Author: Horacio Sanson <https://github.com/hsanson>
+" Description: Support for the Eclipse language server https://github.com/eclipse/eclipse.jdt.ls
+
+let s:version_cache = {}
+
+call ale#Set('java_eclipselsp_path', 'eclipse.jdt.ls')
+call ale#Set('java_eclipselsp_executable', 'java')
+
+function! ale_linters#java#eclipselsp#Executable(buffer) abort
+    return ale#Var(a:buffer, 'java_eclipselsp_executable')
+endfunction
+
+function! ale_linters#java#eclipselsp#TargetPath(buffer) abort
+    return ale#Var(a:buffer, 'java_eclipselsp_path')
+endfunction
+
+function! ale_linters#java#eclipselsp#JarPath(buffer) abort
+    let l:path = ale_linters#java#eclipselsp#TargetPath(a:buffer)
+    let l:path = l:path . '/org.eclipse.jdt.ls.product/target/repository/plugins'
+
+    let l:files = globpath(l:path, 'org.eclipse.equinox.launcher_*.jar', 1, 1)
+
+    if empty(l:files)
+        return ''
+    endif
+
+    return l:files[0]
+endfunction
+
+function! ale_linters#java#eclipselsp#ConfigurationPath(buffer) abort
+    let l:path = ale_linters#java#eclipselsp#TargetPath(a:buffer)
+    let l:path = l:path . '/org.eclipse.jdt.ls.product/target/repository'
+
+    if has('win32')
+        let l:path = l:path . '/config_win'
+    elseif has('macunix')
+        let l:path = l:path . '/config_mac'
+    else
+        let l:path = l:path . '/config_linux'
+    endif
+
+    return ale#path#Simplify(l:path)
+endfunction
+
+function! ale_linters#java#eclipselsp#VersionCheck(version_lines) abort
+    return s:GetVersion('', a:version_lines)
+endfunction
+
+function! s:GetVersion(executable, version_lines) abort
+    let l:version = []
+
+    for l:line in a:version_lines
+        let l:match = matchlist(l:line, '\(\d\+\)\.\(\d\+\)\.\(\d\+\)')
+
+        if !empty(l:match)
+            let l:version = [l:match[1] + 0, l:match[2] + 0, l:match[3] + 0]
+            let s:version_cache[a:executable] = l:version
+            break
+        endif
+    endfor
+
+    return l:version
+endfunction
+
+function! ale_linters#java#eclipselsp#CommandWithVersion(buffer, version_lines, meta) abort
+    let l:executable = ale_linters#java#eclipselsp#Executable(a:buffer)
+    let l:version = s:GetVersion(l:executable, a:version_lines)
+
+    return ale_linters#java#eclipselsp#Command(a:buffer, l:version)
+endfunction
+
+function! ale_linters#java#eclipselsp#Command(buffer, version) abort
+    let l:path = ale#Var(a:buffer, 'java_eclipselsp_path')
+
+    let l:executable = ale_linters#java#eclipselsp#Executable(a:buffer)
+
+    let l:cmd = [ ale#Escape(l:executable),
+    \ '-Declipse.application=org.eclipse.jdt.ls.core.id1',
+    \ '-Dosgi.bundles.defaultStartLevel=4',
+    \ '-Declipse.product=org.eclipse.jdt.ls.core.product',
+    \ '-Dlog.level=ALL',
+    \ '-noverify',
+    \ '-Xmx1G',
+    \ '-jar',
+    \ ale_linters#java#eclipselsp#JarPath(a:buffer),
+    \ '-configuration',
+    \ ale_linters#java#eclipselsp#ConfigurationPath(a:buffer),
+    \ '-data',
+    \ ale#java#FindProjectRoot(a:buffer)
+    \ ]
+
+    if ale#semver#GTE(a:version, [1, 9])
+        call add(l:cmd, '--add-modules=ALL-SYSTEM')
+        call add(l:cmd, '--add-opens java.base/java.util=ALL-UNNAMED')
+        call add(l:cmd, '--add-opens java.base/java.lang=ALL-UNNAMED')
+    endif
+
+    return join(l:cmd, ' ')
+endfunction
+
+function! ale_linters#java#eclipselsp#RunWithVersionCheck(buffer) abort
+    let l:executable = ale_linters#java#eclipselsp#Executable(a:buffer)
+
+    if empty(l:executable)
+        return ''
+    endif
+
+    let l:cache = s:version_cache
+
+    if has_key(s:version_cache, l:executable)
+        return ale_linters#java#eclipselsp#Command(a:buffer, s:version_cache[l:executable])
+    endif
+
+    let l:command = ale#Escape(l:executable) . ' -version'
+
+    return ale#command#Run(
+    \ a:buffer,
+    \ l:command,
+    \ function('ale_linters#java#eclipselsp#CommandWithVersion')
+    \)
+endfunction
+
+call ale#linter#Define('java', {
+\   'name': 'eclipselsp',
+\   'lsp': 'stdio',
+\   'executable': function('ale_linters#java#eclipselsp#Executable'),
+\   'command': function('ale_linters#java#eclipselsp#RunWithVersionCheck'),
+\   'language': 'java',
+\   'project_root': function('ale#java#FindProjectRoot'),
+\})