From ac03952c1384b8c1ce64064578689e46af11be40 Mon Sep 17 00:00:00 2001
From: Taneli Hukkinen <3275109+hukkin@users.noreply.github.com>
Date: Mon, 28 Oct 2024 18:43:15 +0200
Subject: [PATCH] improve: Convert tabs to spaces. Reduce space sequences to
 one space

---
 docs/users/changelog.md           |  1 +
 src/mdformat/renderer/_context.py |  5 +++++
 tests/data/default_style.md       | 22 ++++++++++++++++++++++
 3 files changed, 28 insertions(+)

diff --git a/docs/users/changelog.md b/docs/users/changelog.md
index f4c249c..10ed08f 100644
--- a/docs/users/changelog.md
+++ b/docs/users/changelog.md
@@ -14,6 +14,7 @@ Note that there is currently no guarantee for a stable Markdown formatting style
 - Changed
   - Style: No longer escape square bracket enclosures.
   - Style: No longer escape less than sign followed by space character.
+  - Style: Convert tabs to spaces. Reduce space sequences to one space.
 - Improved
   - Plugin interface: A trailing newline is added to fenced code blocks if a plugin fails to add it.
 
diff --git a/src/mdformat/renderer/_context.py b/src/mdformat/renderer/_context.py
index 936ab87..b9a4da7 100644
--- a/src/mdformat/renderer/_context.py
+++ b/src/mdformat/renderer/_context.py
@@ -111,6 +111,11 @@ def text(node: RenderTreeNode, context: RenderContext) -> str:
     """
     text = node.content
 
+    # Convert tabs to spaces
+    text = text.replace("\t", " ")
+    # Reduce tabs and spaces to one space
+    text = re.sub(" {2,}", " ", text)
+
     # Escape backslash to prevent it from making unintended escapes.
     # This escape has to be first, else we start multiplying backslashes.
     text = text.replace("\\", "\\\\")
diff --git a/tests/data/default_style.md b/tests/data/default_style.md
index 653f4d3..7f1d453 100644
--- a/tests/data/default_style.md
+++ b/tests/data/default_style.md
@@ -508,3 +508,25 @@ Less than sign escapes
 
 \<
 .
+
+Tabs to spaces
+.
+# Convert	tab	to	space	in			headings
+
+Make a space	here.
+.
+# Convert tab to space in headings
+
+Make a space here.
+.
+
+Reduce tabs and spaces to one space
+.
+# Reduce  		in			  	headings
+
+Reduce to a space	 	here.
+.
+# Reduce in headings
+
+Reduce to a space here.
+.