From 8e46a6d6e38cce30fd2a8212d058ae64b8e7fabb Mon Sep 17 00:00:00 2001
From: Syndamia <kamen@syndamia.com>
Date: Sun, 21 Jul 2024 15:30:12 +0300
Subject: (single) Implemented setex-style headings

---
 single.awk | 73 ++++++++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 47 insertions(+), 26 deletions(-)

(limited to 'single.awk')

diff --git a/single.awk b/single.awk
index 1ceb577..46ff93d 100644
--- a/single.awk
+++ b/single.awk
@@ -4,7 +4,7 @@
 # [ ] Block elements
 #     [x] Paragraph
 #     [x] Line break
-#     [.] Headers (atx and setex)
+#     [x] Headers (atx and setex)
 #     [x] Blockquotes
 #     [x] Lists
 #     [ ] Code blocks
@@ -32,10 +32,18 @@
 
 BEGIN {
 	prev_blankline = blankline = 1
+	skipprint = 1
 	newStack("bq-level")
 	newStack("list-level")
 }
 
+function println(line) {
+	if (0 == line) line = $0
+	if (!skipprint) print prev
+	prev = line
+	skipprint = 0
+}
+
 {
 	prev_blankline = blankline
 	blankline = 1
@@ -47,7 +55,7 @@ BEGIN {
 
 # Inline HTML
 /^[[:blank:]]*<\/?[[:alnum:]]+/ {
-	print
+	println()
 	next
 }
 
@@ -74,41 +82,50 @@ BEGIN {
 		$0 = substr($0, RLENGTH + 1)
 		level += RSTART
 		while (topStack("bq-level") > level) {
-			print "</blockquote>"
+			println("</blockquote>")
 			popStack("bq-level")
 		}
 		if (topStack("bq-level") < level) {
-			print "<blockquote>"
+			println("<blockquote>")
 			pushStack("bq-level", level)
 		}
 	}
 }
 
-# Horizontal rules
-/^(-|\*|_) ?(-|\*|_) ?(-|\*|_|[[:blank:]])+$/ {
-	print "<hr>"
-	blankline = 1
-	next
-}
-
-# Line break
-/  $/ {
-	sub(/[[:blank:]]*  $/, "</br>")
-}
-
 # atx-style headers
 /^[[:blank:]]*#+/ {
 	match($0, /#+/)
 	if (RLENGTH <= 6) {
 		gsub(/^[[:blank:]]*#+[[:blank:]]*/, "")
 		gsub(/[[:blank:]]*#+[[:blank:]]*$/, "")
-		print "<h" RLENGTH ">" $0 "</h" RLENGTH ">"
+		println("<h" RLENGTH ">" $0 "</h" RLENGTH ">")
 		blankline = 1
 		next
 	}
 }
+# setex-style headers
+!prev_blankline && /^[[:blank:]]*(=|-)+[[:blank:]]*$/ {
+	sub(/^<p>/, "", prev)
+	hlevel = 1 + ($0 ~ /-/)
+	print "<h" hlevel ">" prev "</h" hlevel ">"
+	prev = ""
+	blankline = 1
+	skipprint = 1
+	next
+}
+
+# Horizontal rules
+/^(-|\*|_) ?(-|\*|_) ?(-|\*|_|[[:blank:]])+$/ {
+	println("<hr>")
+	blankline = 1
+	next
+}
+
+# Line break
+/  $/ {
+	sub(/[[:blank:]]*  $/, "</br>")
+}
 
-# setex-style headers TODO
 
 # Code blocks
 /^(    |\t)[[:blank:]]*/ {
@@ -123,8 +140,8 @@ function abs(x) { return ((x < 0) ? -x : x) }
 	match($0, /(\*|\+|-|[[:digit:]]+\.) /)
 	if (RLENGTH == -1) RLENGTH = 0
 	while (indent + RLENGTH < abs(topStack("list-level"))) {
-		if (topStack("list-level") < 0) print "</ol>"
-		else                            print "</ul>"
+		if (topStack("list-level") < 0) println("</ol>")
+		else                            println("</ul>")
 		popStack("list-level")
 	}
 }
@@ -133,23 +150,23 @@ function abs(x) { return ((x < 0) ? -x : x) }
 	if (abs(topStack("list-level")) < RSTART) {
 		if (RLENGTH > 2) { xl = "<ol>"; mult = -1 }
 		else             { xl = "<ul>"; mult =  1 }
-		print xl "<li>"
+		println(xl "<li>")
 		pushStack("list-level", mult * (RSTART + RLENGTH - 1))
 	}
 	else {
-		print "</li><li>"
+		println("</li><li>")
 	}
 	$0 = substr($0, RSTART + RLENGTH)
 }
 
 # Paragraphs
-prev_blankline && !blankline && lengthStack("bq-level") == 0 && lengthStack("list-level") == 0 { print "<p>" }
-!prev_blankline && blankline && lengthStack("bq-level") == 0 && lengthStack("list-level") == 0 { print "</p>" }
+prev_blankline && !blankline && lengthStack("bq-level") == 0 && lengthStack("list-level") == 0 { $0 = "<p>" $0 }
+!prev_blankline && blankline && lengthStack("bq-level") == 0 && lengthStack("list-level") == 0 { prev = prev "</p>" }
 
 # Blockquote Part 2/2
 blankline {
 	while (lengthStack("bq-level") > 0) {
-		print "</blockquote>"
+		println("</blockquote>")
 		popStack("bq-level")
 	}
 }
@@ -194,9 +211,13 @@ function surround(brace, opening, closing) {
 	surround("`", "<code>", "</code>")
 }
 
-{ print }
+
+{
+	println()
+}
 
 END {
+	print prev
 	if (!blankline && lengthStack("bq-level") == 0) { print "</p>" }
 	while (lengthStack("bq-level") > 0) {
 		print "</blockquote>"
-- 
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