From 8c537aa2956a55fe341e1d48110ae6985ada7e5f Mon Sep 17 00:00:00 2001
From: Zandr Martin <git@zandr.me>
Date: Sat, 06 Jul 2019 15:57:34 -0400
Subject: [PATCH] fix enforcement of 1-step indentation

---
 src/main.c  |  9 +++++----
 test/indent | 11 +++++++++++

diff --git a/src/main.c b/src/main.c
index 2508a7f0ded51471729b78f7247305adf2f37f3a..688b544d9c09803f478cbaa6c704edb1a2ffe741 100644
--- a/src/main.c
+++ b/src/main.c
@@ -286,9 +286,12 @@ 	while ((ch = parser_getch(p)) == '\t') {
 		++i;
 	}
 	parser_pushch(p, ch);
-	if (ch == '\n' && *indent != 0) {
-		// Don't change indent when we encounter empty lines
+	if ((ch == '\n' || ch == UTF8_INVALID) && *indent != 0) {
+		// Don't change indent when we encounter empty lines or EOF
 		return *indent;
+	}
+	if (abs(i - *indent) > 1) {
+		parser_fatal(p, "Changed indentation by an amount greater than 1");
 	}
 	if (write) {
 		if (i < *indent) {
@@ -297,8 +300,6 @@ 				roff_macro(p, "RE", NULL);
 			}
 		} else if (i == *indent + 1) {
 			fprintf(p->output, ".RS 4\n");
-		} else if (i != *indent && ch == '\t') {
-			parser_fatal(p, "Indented by an amount greater than 1");
 		}
 	}
 	*indent = i;
diff --git a/test/indent b/test/indent
index 087e30c9aaf450575d75247258a2a547e7efe8fd..0df281d15ba536518c0e24ff5e8467cdb028696c 100755
--- a/test/indent
+++ b/test/indent
@@ -19,3 +19,14 @@ 	Indented one level
 Not indented
 EOF
 end 0
+
+begin "Disallows indentation changes > 1"
+scdoc <<EOF >/dev/null
+test(8)
+
+Not indented
+	Indented one level
+			Indented three levels
+Not indented
+EOF
+end 1

-- 
2.48.1