Add options to customize vim indentation options (#17)

Fixes #12

README.md

@@ -62,6 +62,15 @@ require('guess-indent').setup {
     "terminal",
     "prompt",
   },
+  on_tab_options = { -- A table of vim options when tabs are detected 
+    ["expandtab"] = false,
+  },
+  on_space_options = { -- A table of vim options when spaces are detected 
+    ["expandtab"] = true,
+    ["tabstop"] = "detected", -- If the option value is 'detected', The value is set to the automatically detected indent size.
+    ["softtabstop"] = "detected",
+    ["shiftwidth"] = "detected",
+  },
 }
 ```
 

doc/guess_indent.txt

@@ -65,6 +65,12 @@ instead.
 
 `buftype_exclude`	Same as `filetype_exclude` but for 'buftype' instead.
 
+`on_tab_options`	A table of vim options when tabs are detected.
+
+`on_space_options`	A table of vim options when spaces are detected.
+			If the option value is `'detected'`, The value is set
+			to the automatically detected indent size.
+
 ==============================================================================
 COMMANDS                                                *GuessIndent-commands*
 

lua/guess-indent/config.lua

@@ -5,6 +5,8 @@ local M = {}
 ---@field override_editorconfig boolean? Whether or not to override indentation set by Editorconfig
 ---@field filetype_exclude string[]? Filetypes to ignore indentation detection in
 ---@field buftype_exclude string[]? Buffer types to ignore indentation detection in
+---@field on_tab_options table<string, any>? A table of vim options when tabs are detected
+---@field on_space_options table<string, any>? A table of vim options when spaces are detected
 
 ---@class GuessIndentConfigModule: GuessIndentConfig
 ---@field set_config fun(GuessIndentConfig)
@@ -23,6 +25,15 @@ local default_config = {
     "terminal",
     "prompt",
   },
+  on_tab_options = {
+    ["expandtab"] = false,
+  },
+  on_space_options = {
+    ["expandtab"] = true,
+    ["tabstop"] = "detected",
+    ["softtabstop"] = "detected",
+    ["shiftwidth"] = "detected",
+  },
 }
 
 -- The current active config

lua/guess-indent/init.lua

@@ -110,13 +110,17 @@ local function set_indentation(indentation, bufnr, silent)
 
   local notification = "Failed to detect indentation style."
   if indentation == "tabs" then
-    set_buffer_opt(bufnr, "expandtab", false)
+    for opt, value in pairs(config.on_tab_options) do
+      set_buffer_opt(bufnr, opt, value)
+    end
     notification = "Did set indentation to tabs."
   elseif type(indentation) == "number" and indentation > 0 then
-    set_buffer_opt(bufnr, "expandtab", true)
-    set_buffer_opt(bufnr, "tabstop", indentation)
-    set_buffer_opt(bufnr, "softtabstop", indentation)
-    set_buffer_opt(bufnr, "shiftwidth", indentation)
+    for opt, value in pairs(config.on_space_options) do
+      if value == "detected" then
+        value = indentation
+      end
+      set_buffer_opt(bufnr, opt, value)
+    end
     notification = ("Did set indentation to %s space(s)."):format(indentation)
   end
   if not silent then