leverage PATH for locating local executables (#283)

1. This is a breaking change for the following servers, which will have to be
reinstalled:

 - ltex
 - clangd

2. This is a breaking change for users who reach into the default options (for
   example via server:get_default_options()) to access the `cmd` property.
   nvim-lsp-installer no longer provides the `cmd` (except in a few
   instances), but instead provides an amended PATH which allows neovim's LSP
   client to locate the locally installed executable.

   To access the `cmd`, simply access it via lspconfig instead, for example
   like so:

    local default_config = require("lspconfig.server_configurations.rust_analyzer").default_config
    print("I can now access the cmd governed by lspconfig:", default_config.cmd)

3. This is a breaking change for 3rd party use cases that makes use of the
   `executable()` APIs (e.g., `npm.executable(root_dir, "tsserver")`). The
   recommended usage is to instead to use the canonical name of the command
   ("tsserver"), while providing an amended PATH, for example:

    local npm = require("nvim-lsp-installer.installers.npm")
    local server = server.Server:new {
        ...,
        root_dir = root_dir,
        installer = npm.packages { "tsserver" },
        default_options = {
            cmd = { "tsserver" },
            cmd_env = npm.env(root_dir),
        }
    }

1 files changed, 2 insertions, 2 deletions

diff --git a/lua/nvim-lsp-installer/server.lua b/lua/nvim-lsp-installer/server.lua
index 1a23bbbd..153b0605 100644
--- a/lua/nvim-lsp-installer/server.lua
+++ b/lua/nvim-lsp-installer/server.lua
@@ -72,7 +72,7 @@ end
 
 ---Attaches this server to all current open buffers with a 'filetype' that matches the server's configured filetypes.
 function M.Server:attach_buffers()
-    log.debug("Attaching server to buffers", self.name)
+    log.trace("Attaching server to buffers", self.name)
     local lsp_server = require("lspconfig")[self.name]
     for _, bufnr in ipairs(vim.api.nvim_list_bufs()) do
         if lsp_server.filetypes then
@@ -83,7 +83,7 @@ function M.Server:attach_buffers()
             lsp_server.manager.try_add(bufnr)
         end
     end
-    log.debug("Successfully attached server to buffers", self.name)
+    log.trace("Successfully attached server to buffers", self.name)
 end
 
 ---Registers a handler (callback) to be executed when the server is ready to be setup.