metals (75

Co-authored-by: Hirokazu Hata <h.hata.ai.t@gmail.com>

3 files changed, 141 insertions, 0 deletions

diff --git a/README.md b/README.md
index 01f2e986..1e2272c8 100644
--- a/README.md
+++ b/README.md
@@ -208,6 +208,7 @@ that config.
 - [hie](#hie)
 - [intelephense](#intelephense)
 - [leanls](#leanls)
+- [metals](#metals)
 - [ocamlls](#ocamlls)
 - [pyls](#pyls)
 - [pyls_ms](#pyls_ms)
@@ -1362,6 +1363,66 @@ require'nvim_lsp'.leanls.setup{}
     settings = {}
 ```
 
+## metals
+
+https://scalameta.org/metals/
+
+Scala language server with rich IDE features.
+`metals` can be installed via `:LspInstall metals`.
+
+Can be installed in Nvim with `:LspInstall metals`
+This server accepts configuration via the `settings` key.
+<details><summary>Available settings:</summary>
+
+- **`metals.customRepositories`**: `array`
+
+  Array items: `{type = "string"}`
+
+- **`metals.gradleScript`**: `string`
+
+  
+
+- **`metals.javaHome`**: `string`
+
+  
+
+- **`metals.mavenScript`**: `string`
+
+  
+
+- **`metals.millScript`**: `string`
+
+  
+
+- **`metals.sbtScript`**: `string`
+
+  
+
+- **`metals.scalafmtConfigPath`**: `string`
+
+  
+
+- **`metals.serverProperties`**: `array`
+
+  Array items: `{type = "string"}`
+
+- **`metals.serverVersion`**: `string`
+
+  Default: `"0.7.6"`
+
+</details>
+
+```lua
+require'nvim_lsp'.metals.setup{}
+
+  Default Values:
+    cmd = { "metals" }
+    filetype = { "scala", "sbt" }
+    log_level = 2
+    root_dir = util.root_pattern("build.sbt")
+    settings = {}
+```
+
 ## ocamlls
 
 https://github.com/ocaml-lsp/ocaml-language-server
diff --git a/lua/nvim_lsp.lua b/lua/nvim_lsp.lua
index dffdb6ae..734e1175 100644
--- a/lua/nvim_lsp.lua
+++ b/lua/nvim_lsp.lua
@@ -21,6 +21,7 @@ require 'nvim_lsp/solargraph'
 require 'nvim_lsp/sumneko_lua'
 require 'nvim_lsp/texlab'
 require 'nvim_lsp/tsserver'
+require 'nvim_lsp/metals'
 require 'nvim_lsp/vimls'
 require 'nvim_lsp/ocamlls'
 require 'nvim_lsp/terraformls'
diff --git a/lua/nvim_lsp/metals.lua b/lua/nvim_lsp/metals.lua
new file mode 100644
index 00000000..01432ed1
--- /dev/null
+++ b/lua/nvim_lsp/metals.lua
@@ -0,0 +1,79 @@
+local skeleton = require 'nvim_lsp/skeleton'
+local util = require 'nvim_lsp/util'
+local lsp = vim.lsp
+local server_name = "metals"
+local bin_name = "metals"
+
+local function make_installer()
+  local install_dir = util.path.join{util.base_install_dir, server_name}
+  local metals_bin = util.path.join{install_dir, bin_name}
+  local X = {}
+  function X.install()
+    local install_info = X.info()
+    if install_info.is_installed then
+      print(server_name, "is already installed")
+      return
+    end
+    if not (util.has_bins("curl")) then
+      error('Need "curl" to install this.')
+      return
+    end
+    if not (util.has_bins("java")) then
+      error('Need "JDK" to install this.')
+      return
+    end
+    local coursier_bin = install_dir .. "/coursier"
+    local download_cmd = string.format("curl -fLo %s --create-dirs https://git.io/coursier", coursier_bin)
+    local chmod_cmd = string.format("chmod +x %s", coursier_bin)
+    local install_cmd = string.format("%s bootstrap --java-opt -Xss4m --java-opt -Xms100m --java-opt -Dmetals.client=coc.nvim org.scalameta:metals_2.12:latest.release -r bintray:scalacenter/releases -r sonatype:snapshots -o %s -f", coursier_bin, metals_bin)
+    vim.fn.system(download_cmd)
+    vim.fn.system(chmod_cmd)
+    vim.fn.system(install_cmd)
+  end
+  function X.info()
+    return {
+      is_installed = util.path.exists(metals_bin);
+      install_dir = install_dir;
+      cmd = { metals_bin };
+    }
+  end
+  function X.configure(config)
+    local install_info = X.info()
+    if install_info.is_installed then
+      config.cmd = install_info.cmd
+    end
+  end
+  return X
+end
+
+local installer = make_installer()
+
+skeleton[server_name] = {
+  default_config = {
+    cmd = {bin_name};
+    filetype = {"scala"};
+    root_dir = util.root_pattern("build.sbt", "build.sc", "build.gradle", "pom.xml");
+    log_level = lsp.protocol.MessageType.Warning;
+    settings = {};
+  };
+  on_new_config = function(config)
+    installer.configure(config)
+  end;
+  docs = {
+    vscode = "scalameta.metals";
+    package_json = "https://raw.githubusercontent.com/scalameta/metals-vscode/master/package.json";
+    description = [[
+https://scalameta.org/metals/
+
+Scala language server with rich IDE features.
+`metals` can be installed via `:LspInstall metals`.
+]];
+    default_config = {
+      root_dir = [[util.root_pattern("build.sbt")]];
+    };
+  };
+};
+
+skeleton[server_name].install = installer.install
+skeleton[server_name].install_info = installer.info
+-- vim:et ts=2 sw=2