Redo installation. (#17)

* Redo installation.

Servers which want to be auto installed should specify
skeleton[name].install()
and it will be automatically added to the list of installable servers.

- Add :LspInstall and :LspInstallInfo
- Auto generate docs for servers with .install() available.
- Add util.npm_installer
- Refactor utf8 capabilities common config into a single function
- Add contribution notes.
- Also expose util.base_install_dir for other installers potentially
- Fix tsserver's arguments and add javascript filetypes

1 files changed, 67 insertions, 1 deletions

diff --git a/lua/nvim_lsp.lua b/lua/nvim_lsp.lua
index 550d56dd..629b6b0a 100644
--- a/lua/nvim_lsp.lua
+++ b/lua/nvim_lsp.lua
@@ -1,5 +1,5 @@
 local skeleton = require 'nvim_lsp/skeleton'
-require 'nvim_lsp/bash'
+require 'nvim_lsp/bashls'
 require 'nvim_lsp/clangd'
 require 'nvim_lsp/elmls'
 require 'nvim_lsp/gopls'
@@ -11,6 +11,72 @@ local M = {
   util = require 'nvim_lsp/util';
 }
 
+function M.available_servers()
+  return vim.tbl_keys(skeleton)
+end
+
+function M.installable_servers()
+  local res = {}
+  for k, v in pairs(skeleton) do
+    if v.install then table.insert(res, k) end
+  end
+  return res
+end
+
+M._root = {}
+-- Called from plugin/nvim_lsp.vim because it requires knowing that the last
+-- script in scriptnames to be executed is nvim_lsp.
+function M._root._setup()
+  local snr = tonumber(table.remove(vim.split(vim.fn.execute("scriptnames"), '\n')):match("^%s*(%d+)"))
+  local function sid(s)
+    return string.format("<SNR>%d_%s", snr, s)
+  end
+
+  M._root.commands = {
+    LspInstall = {
+      function(name)
+        local template = skeleton[name]
+        if not template then
+          return print("Invalid server name:", name)
+        end
+        if not template.install then
+          return print(name, "can't be automatically installed (yet)")
+        end
+        if template.install_info().is_installed then
+          return print(name, "is already installed")
+        end
+        template.install()
+      end;
+      "-nargs=1";
+      "-complete=custom,"..sid("complete_installable_server_names");
+      description = '`:LspInstall {name}` installs a server under stdpath("cache")/nvim_lsp/{name}';
+    };
+    LspInstallInfo = {
+      function(name)
+        if name == nil then
+          local res = {}
+          for k, v in pairs(skeleton) do
+            if v.install_info then
+              res[k] = v.install_info()
+            end
+          end
+          return print(vim.inspect(res))
+        end
+        local template = skeleton[name]
+        if not template then
+          return print("Invalid server name:", name)
+        end
+        return print(vim.inspect(template.install_info()))
+      end;
+      "-nargs=?";
+      "-complete=custom,"..sid("complete_installable_server_names");
+      description = 'Print installation info for {name} if one is specified, or all installable servers.';
+    };
+  };
+
+  M.util.create_module_commands("_root", M._root.commands)
+end
+
 local mt = {}
 function mt:__index(k)
   return skeleton[k]