provide setup options for defaults

README.md

@@ -1,20 +1,52 @@
 # LSP-Preview.nvim
 
-A plugin to that allows previewing of all changes done to a workspace before
+A plugin that allows previewing of all changes done to a workspace before
 applying.
 
+Note: This plugin affects all workspace edits coming from the language server.
+Not all are currently supported, if you run into problems with other methods,
+please let me know.
+
+## Installation
+
+lazy.nvim:
+
+```lua
+{
+  'jan-xyz/lsp-preview.nvim',
+  opts = {},
+}
+```
+
+## Configuration
+
+If you're fine with the defaults, you're good to go after installation. If you
+want to tweak, call this function:
+
+```lua
+require("dressing").setup({
+ --Automatically apply code-actions if there is only 1 available.
+ apply = true,
+ --Configuration provided to vim.diff (see `:h vim.diff()`)
+ diff = {
+  ctxlen = 5,
+ },
+})
+```
+
 ## TODO
 
 * [x] implement selection
 * [x] auto-select all changes
 * [x] implement rename
 * [x] make it work with normal workspace edits
 * [x] don't rely on picker order selection
-* [ ] break-down by edit and not by file
-* [ ] one buffer for all changes in a file, view-port shifts on selection
-* [ ] buffer contents updates based on selected changes
-* [ ] Allow sorting list by token type that changes (e.g. var, class, comment)
 * [x] allow disabling the preview
+* [x] provide configuration options
+* [ ] break-down by edit and not by file, one buffer for all changes in a file,
+  view-port shifts on selection, buffer contents updates based on selected
+  changes
+* [ ] Allow sorting list by token type that changes (e.g. var, class, comment)
 
 ## Inspired by
 

lua/lsp-preview/config.lua

@@ -0,0 +1,28 @@
+local M = {}
+
+---@class Options
+---Automatically apply code-actions if there is only 1 available.
+---@field apply boolean
+---Configuration provided to vim.diff (see `:h vim.diff()`)
+---@field diff table
+local default_config = {
+	apply = true,
+	diff = {
+		ctxlen = 5,
+	},
+}
+
+
+local user_config = default_config
+
+function M.setup(config)
+	user_config = vim.tbl_deep_extend("force", default_config, config)
+end
+
+setmetatable(M, {
+	__index = function(_, key)
+		return user_config[key]
+	end,
+})
+
+return M

lua/lsp-preview/init.lua

@@ -1,4 +1,5 @@
 local lWorkspaceEdit = require("lsp-preview.workspace_edit")
+local config = require("lsp-preview.config")
 
 local util = require("vim.lsp.util")
 
@@ -7,12 +8,14 @@ local M = {}
 -- The original workspace_edit from the std library of vim for backup and resets.
 local apply_workspace_edit = util.apply_workspace_edit
 
-function M.setup(_)
-
+---Setup the default behaviour of the plugin
+---@param opts Options
+function M.setup(opts)
+	config.setup(opts)
 end
 
 M.rename = function(new_name, opts)
-	opts = opts or {}
+	opts = vim.tbl_deep_extend("force", config, opts or {})
 
 	-- Reset it to the original before every operation in case of a failure.
 	---@diagnostic disable-next-line: duplicate-set-field
@@ -37,7 +40,7 @@ M.rename_preview = function(new_name, opts)
 end
 
 M.code_action = function(opts)
-	opts = opts or {}
+	opts = vim.tbl_deep_extend("force", config, opts or {})
 
 	-- Reset it to the original before every operation in case of a failure.
 	---@diagnostic disable-next-line: duplicate-set-field

lua/lsp-preview/workspace_edit.lua

@@ -1,5 +1,6 @@
 local lDiff = require("lsp-preview.diff")
 local lTelescope = require("lsp-preview.telescope")
+local config = require("lsp-preview.config")
 
 local M = {}
 
@@ -41,12 +42,11 @@ end
 M.make_apply_workspace_edit = function(orig_apply_workspace_edits)
 	return function(workspace_edit, offset_encoding)
 		local documentChanges, changes = lDiff.get_changes(workspace_edit, offset_encoding)
-		local opt = {}
-		opt.diff = { ctxlen = 20 } -- provide a large diff context view
 
+		local opts = config
 
 		lTelescope.apply_action(
-			opt,
+			opts,
 			documentChanges,
 			changes,
 			make_apply_func(workspace_edit, offset_encoding, orig_apply_workspace_edits)