From 2a0846b60410e5714ea626d35064b2152419df77 Mon Sep 17 00:00:00 2001
From: Francesco Abbate <francesco.bbt@gmail.com>
Date: Fri, 19 Feb 2021 11:51:49 +0100
Subject: [PATCH] Automatic keep adjusting indent size

When too few lines keep adjusting indent size
---
 data/core/statusview.lua      |  2 ++
 data/plugins/detectindent.lua | 24 ++++++++++++++++--------
 2 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/data/core/statusview.lua b/data/core/statusview.lua
index 2710b1ba..e96c6fe1 100644
--- a/data/core/statusview.lua
+++ b/data/core/statusview.lua
@@ -119,6 +119,8 @@ function StatusView:get_items()
       self.separator,
       string.format("%d%%", line / #dv.doc.lines * 100),
     }, {
+      style.text, "spaces: ", tostring(dv.doc.indent_spaces),
+      style.dim, self.separator2, style.text,
       style.icon_font, "g",
       style.font, style.dim, self.separator2, style.text,
       #dv.doc.lines, " lines",
diff --git a/data/plugins/detectindent.lua b/data/plugins/detectindent.lua
index 18ce6224..250fba09 100644
--- a/data/plugins/detectindent.lua
+++ b/data/plugins/detectindent.lua
@@ -91,19 +91,27 @@ local function detect_indent_stat(doc)
   table.sort(stat, function(a, b) return a[1] < b[1] end)
   local indent, score = optimal_indent_from_stat(stat)
   if tab_count > score then
-    core.log_quiet("Detect-indent: using tabs indentation")
-    return "hard"
-  elseif indent then
-    core.log_quiet("Detect-indent: using indentation size of %d", indent)
-    return "soft", indent
+    return "hard", nil, tab_count
+  else
+    return "soft", indent or config.indent_size, score or 0
   end
 end
 
 
+local doc_text_input = Doc.text_input
+local adjust_threshold = 5
+
 local function update_cache(doc)
-  local type, size = detect_indent_stat(doc)
-  if type then
-    cache[doc] = { type = type, size = size }
+  local type, size, score = detect_indent_stat(doc)
+  cache[doc] = { type = type, size = size }
+  doc.indent_spaces = (type == "hard" and "tab" or size) .. (score < adjust_threshold and "*" or "")
+  if score < adjust_threshold and Doc.text_input == doc_text_input then
+    Doc.text_input = function(self, ...)
+      doc_text_input(self, ...)
+      update_cache(self)
+    end
+  elseif score >= adjust_threshold and Doc.text_input ~= doc_text_input then
+    Doc.text_input = doc_text_input
   end
 end