feature(jdtls): add jdt ls for java (#245)

1 files changed, 138 insertions, 0 deletions

diff --git a/lua/nvim_lsp/jdtls.lua b/lua/nvim_lsp/jdtls.lua
new file mode 100644
index 00000000..ed0f022d
--- /dev/null
+++ b/lua/nvim_lsp/jdtls.lua
@@ -0,0 +1,138 @@
+local configs = require 'nvim_lsp/configs'
+local util = require 'nvim_lsp/util'
+local callbacks = require 'vim.lsp.callbacks'
+local path = util.path
+
+local server_name = "jdtls"
+
+local function make_installer()
+  local install_dir = path.join { util.base_install_dir, server_name }
+  local tar_name = "jdt-language-server-latest.tar.gz"
+  local script = string.format([[
+    curl -LO http://download.eclipse.org/jdtls/snapshots/%s > %s
+    tar xf %s
+  ]], tar_name, tar_name, tar_name)
+  local launcher_ls = "ls " .. path.join { install_dir, "plugins", "org.eclipse.equinox.launcher_*.jar" }
+
+  local X = {}
+
+  function X.install()
+    if not util.has_bins("curl", "tar") then
+      error('Need the binaries "curl", "tar" to install this.')
+      return
+    end
+
+    vim.fn.mkdir(install_dir, "p")
+    util.sh(script, install_dir)
+  end
+
+  function X.info()
+    return {
+      is_installed = util.path.exists(install_dir, 'features') ~= false;
+      install_dir = install_dir;
+    }
+  end
+
+  function X.get_os_config()
+    if vim.fn.has("osx") == 1 then
+      return "config_mac"
+    elseif vim.fn.has("unix") == 1 then
+      return "config_linux"
+    else
+      return "config_win"
+    end
+  end
+
+  function X.get_launcher()
+    local file = io.popen(launcher_ls)
+    local results = {}
+
+    for line in file:lines() do
+      table.insert(results, line)
+    end
+
+    if #results == 1 then
+      return results[1]
+    end
+
+    error("Could not find launcher for jdtls.")
+  end
+
+  function X.configure(config)
+    local install_info = X.info()
+    local launcher_path = X.get_launcher()
+
+    if install_info.is_installed then
+      config.cmd = vim.list_extend(
+        vim.list_extend(
+          {
+            "java",
+            "-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",
+          },
+          config.init_options.jvm_args),
+        {
+          "-jar", launcher_path,
+          "-configuration", path.join { install_dir, config.init_options.os_config or X.get_os_config() },
+          "-data", config.init_options.workspace,
+          -- TODO: Handle Java versions 8 and under. This may just work...
+          "--add-modules=ALL-SYSTEM",
+          "--add-opens", "java.base/java.util=ALL-UNNAMED",
+          "--add-opens", "java.base/java.lang=ALL-UNNAMED"
+        })
+    end
+  end
+
+  return X
+end
+
+local installer = make_installer()
+
+configs[server_name] = {
+  default_config = {
+    filetypes = { "java" };
+    root_dir = util.root_pattern('.git');
+    init_options = {
+      workspace = path.join { vim.loop.os_homedir(), "workspace" };
+      jvm_args = {};
+      os_config = nil;
+    };
+    callbacks = {
+      -- Due to an invalid protocol implementation in the jdtls we have to
+      -- conform these to be spec compliant.
+      -- https://github.com/eclipse/eclipse.jdt.ls/issues/376
+      ['textDocument/codeAction'] = function(a, b, actions)
+        for _,action in ipairs(actions) do
+          -- TODO: (steelsojka) Handle more than one edit?
+          if action.command == 'java.apply.workspaceEdit' then
+            action.edit = action.arguments[1]
+          end
+        end
+
+        callbacks['textDocument/codeAction'](a, b, actions)
+      end
+    };
+  };
+  on_new_config = function(config)
+    installer.configure(config)
+  end;
+  docs = {
+    description = [[
+https://projects.eclipse.org/projects/eclipse.jdt.ls
+
+Language server can be installed with `:LspInstall jdtls`
+
+Language server for Java.
+    ]];
+    default_config = {
+      root_dir = [[root_pattern(".git")]];
+    };
+  };
+}
+
+configs[server_name].install = installer.install
+configs[server_name].install_info = installer.info