htmltools

commit db65ee451af79646fc180dbfdfbcf6f78db94497
parent 39f445d0b67c3b736ce6d2e88c47c5dcaa077941
Author: Lukas Henkel <lh@entf.net>
Date:   Mon, 17 Aug 2020 18:48:03 +0200

Add htmlindentheadings

Diffstat:
M
Makefile
 | 
2
+-
M
go.mod
 | 
2
++
A
htmlindentheadings/htmlindentheadings.1.scd
 | 
21
+++++++++++++++++++++
A
htmlindentheadings/main.go
 | 
51
+++++++++++++++++++++++++++++++++++++++++++++++++++

4 files changed, 75 insertions(+), 1 deletion(-)
diff --git a/Makefile b/Makefile
@@ -1,4 +1,4 @@
-TOOLS = htmlremove htmltotext htmlunwrap htmlselect
+TOOLS = htmlremove htmltotext htmlunwrap htmlselect htmlindentheadings
 PREFIX = /usr/local
 MANS = $(shell find . -name '*.scd' | sed s/\.scd//)
 
diff --git a/go.mod b/go.mod
@@ -4,3 +4,5 @@ require (
 	github.com/andybalholm/cascadia v1.0.0
 	golang.org/x/net v0.0.0-20190320064053-1272bf9dcd53
 )
+
+go 1.13
diff --git a/htmlindentheadings/htmlindentheadings.1.scd b/htmlindentheadings/htmlindentheadings.1.scd
@@ -0,0 +1,21 @@
+HTMLINDENTHEADINGS(1)
+
+# NAME
+
+htmlindentheadings - indents all headings by a specified amount
+
+# SYNOPSIS
+
+*htmlindentheadings* INDENT_LEVELS [_FILE_]...
+
+# DESCRIPTION
+
+Indents the heading elements (h1 to h7) of all files by the specified level. For
+example, if the specified indent level is 2, all h1 elements would become h3
+elements, all h2 elements would become h4 elements and so on. htmlindentheadings
+does not create invalid HTML, so it will not go beyond h7. INDENT_LEVELS can
+also be a negative number, to decrease the indentation of heading elements.
+
+# AUTHOR
+
+Lukas Henkel <lh@entf.net>
diff --git a/htmlindentheadings/main.go b/htmlindentheadings/main.go
@@ -0,0 +1,51 @@
+package main // import "entf.net/htmltools/htmlindentheadings"
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+
+	"golang.org/x/net/html"
+
+	"entf.net/htmltools/shared"
+)
+
+const usage = "usage: htmlindentheadings INDENT_LEVELS [FILES...]"
+
+func main() {
+	args := os.Args[1:]
+	if len(args) == 0 {
+		fmt.Println(usage)
+		os.Exit(1)
+	}
+	lvls, err := strconv.Atoi(args[0])
+	if err != nil {
+		fmt.Println(usage)
+		os.Exit(1)
+	}
+	shared.Main(args[1:], func(doc *html.Node) {
+		visit(lvls, doc)
+		html.Render(os.Stdout, doc)
+	})
+}
+
+func indent(lvls int, tag string) string {
+	l := int(tag[1]) - 48
+	l += lvls
+	if l > 6 {
+		l = 6
+	}
+	return fmt.Sprintf("h%d", l)
+}
+
+func visit(lvls int, n *html.Node) {
+	if n.Type == html.ElementNode {
+		switch n.Data {
+		case "h1", "h2", "h3", "h4", "h5", "h6":
+			n.Data = indent(lvls, n.Data)
+		}
+	}
+	for c := n.FirstChild; c != nil; c = c.NextSibling {
+		visit(lvls, c)
+	}
+}