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, 0 insertions, 11 deletions

diff --git a/lua/nvim-lsp-installer/path.lua b/lua/nvim-lsp-installer/path.lua
index 533be48d..5d3fcee4 100644
--- a/lua/nvim-lsp-installer/path.lua
+++ b/lua/nvim-lsp-installer/path.lua
@@ -27,17 +27,6 @@ function M.concat(path_components)
     return table.concat(path_components, sep)
 end
 
--- @param relpath string The relative path to get the realpath(1) to.
--- @param depth number The depth in the call stack to introspect. This effectively controls which stack frame should be used when producing the realpath.
---                     The file of the elected stack frame will be used as the "starting point" for the provided relpath.
---
--- @return The realpath (absolute path). Note that this will currently produce results such as /Users/zuck/./script.js which may not be compatible with some tools.
-function M.realpath(relpath, depth)
-    local callsite_abs_path = debug.getinfo(depth or 2, "S").source:sub(2)
-    local normalized_relpath = relpath:gsub("./", "")
-    return M.concat { vim.fn.fnamemodify(callsite_abs_path, ":h"), normalized_relpath }
-end
-
 function M.is_subdirectory(root_path, path)
     return root_path == path or path:sub(1, #root_path + 1) == root_path .. sep
 end