Update link checking utility

Author: marijnh

Makefile

@@ -12,7 +12,7 @@ html/%.html: %.md
 	node src/render_html.js $< > $@
 	node src/build_code.js $<
 
-html/js/chapter_info.js: $(foreach CHAP,$(CHAPTERS),$(CHAP).txt) code/solutions/* bin/chapter_info.js
+html/js/chapter_info.js: $(foreach CHAP,$(CHAPTERS),$(CHAP).txt) code/solutions/* src/chapter_info.js
 	node src/chapter_info.js > html/js/chapter_info.js
 
 html/js/acorn_codemirror.js: node_modules/codemirror/lib/codemirror.js \
@@ -43,81 +43,5 @@ test: html
 	@for F in $(CHAPTERS); do echo Testing $$F:; node bin/run_tests.js $$F.txt; done
 	@! grep '[a-zA-Z0-9]_[—“”‘’]\|[—“”‘’]_[a-zA-Z0-9]\|[a-zA-Z0-9]`—\|[a-zA-Z0-9]`[a-zA-Z0-9]' *.txt
 	@! grep '(!book\|(!html|(!interactive|(!tex' html/*.html nostarch/*.tex
-	@node bin/check_links.js
+	@node src/check_links.js
 	@echo Done.
-
-nostarch: $(foreach CHAP,$(CHAPTERS),nostarch/$(CHAP).tex) nostarch/hints.tex
-
-nostarch/hints.tex: $(foreach CHAP,$(CHAPTERS),$(CHAP).txt) bin/extract_hints.js
-	node bin/extract_hints.js | node bin/pre_latex.js --nostarch - | asciidoc -f asciidoc_nostarch.conf --backend=latex -o - - | node bin/clean_latex.js > $@
-
-nostarch/%.tex: %.txt asciidoc_nostarch.conf bin/pre_latex.js bin/clean_latex.js
-	node bin/pre_latex.js --nostarch $< | asciidoc -f asciidoc_nostarch.conf --backend=latex -o - - | node bin/clean_latex.js > $@
-
-nostarch.pdf: nostarch/book.tex $(foreach CHAP,$(CHAPTERS),nostarch/$(CHAP).tex) nostarch/hints.tex \
-          $(patsubst img/%.svg,img/generated/%.pdf,$(SVGS))
-	cd nostarch && sh build.sh
-	mv nostarch/book.pdf nostarch.pdf
-
-pdf: $(foreach CHAP,$(CHAPTERS),pdf/$(CHAP).tex) pdf/hints.tex
-
-pdf/hints.tex: $(foreach CHAP,$(CHAPTERS),$(CHAP).txt) bin/extract_hints.js asciidoc_pdf.conf bin/pre_latex.js bin/clean_latex.js
-	node bin/extract_hints.js | node bin/pre_latex.js - | asciidoc -f asciidoc_pdf.conf --backend=latex -o - - | node bin/clean_latex.js > $@
-
-pdf/%.tex: %.txt asciidoc_pdf.conf bin/pre_latex.js bin/clean_latex.js
-	node bin/pre_latex.js $< | asciidoc -f asciidoc_pdf.conf --backend=latex -o - - | node bin/clean_latex.js > $@
-
-book.pdf: pdf/book.tex $(foreach CHAP,$(CHAPTERS),pdf/$(CHAP).tex) pdf/hints.tex \
-          $(patsubst img/%.svg,img/generated/%.pdf,$(SVGS))
-	cd pdf && sh build.sh book > /dev/null
-	mv pdf/book.pdf .
-
-pdf/book_mobile.tex: pdf/book.tex
-	cat pdf/book.tex | sed -e 's/makeidx}/makeidx}\n\\usepackage[a5paper, left=5mm, right=5mm]{geometry}/' | sed -e 's/setmonofont.Scale=0.8./setmonofont[Scale=0.75]/' > pdf/book_mobile.tex
-
-book_mobile.pdf: pdf/book_mobile.tex $(foreach CHAP,$(CHAPTERS),pdf/$(CHAP).tex) pdf/hints.tex \
-          $(patsubst img/%.svg,img/generated/%.pdf,$(SVGS))
-	cd pdf && sh build.sh book_mobile > /dev/null
-	mv pdf/book_mobile.pdf .
-
-pdfonce:
-	cd pdf && xelatex book.tex
-	mv pdf/book.pdf book.pdf
-
-texclean:
-	rm -f nostarch/book.aux nostarch/book.idx nostarch/book.log nostarch/book.out nostarch/book.tbc nostarch/book.toc
-	rm -f pdf/book.aux pdf/book.idx pdf/book.log pdf/book.out pdf/book.tbc pdf/book.toc
-
-TMPDIR=/tmp/ejs_tex
-
-ejs_tex.zip: nostarch/book.tex $(foreach CHAP,$(CHAPTERS),nostarch/$(CHAP).tex) nostarch/hints.tex \
-             $(patsubst img/%.svg,img/generated/%.pdf,$(SVGS))
-	rm -rf $@ $(TMPDIR)
-	mkdir -p $(TMPDIR)
-	cp nostarch/*.tex $(TMPDIR)
-	cp nostarch/book.tex $(TMPDIR)
-	cp nostarch/build.sh nostarch/nostarch.cls nostarch/nshyper.sty nostarch/nostarch.ins $(TMPDIR)
-	grep includegraphics nostarch/*.tex | sed -e 's/.*{\(.*\)}/\1/' | xargs -I{} cp --parents "{}" $(TMPDIR)
-	cd /tmp; zip -r ejs_tex.zip ejs_tex
-	mv /tmp/ejs_tex.zip $@
-	rm -rf $(TMPDIR)
-
-book.epub: epub/titlepage.xhtml epub/toc.xhtml epub/hints.xhtml $(foreach CHAP,$(CHAPTERS),epub/$(CHAP).xhtml) \
-	   epub/content.opf.src epub/style.css bin/add_images_to_epub.js
-	rm -f $@
-	grep '<img' epub/*.xhtml | sed -e 's/.*src="\([^"]*\)".*/\1/' | xargs -I{} cp --parents "{}" epub
-	node bin/add_images_to_epub.js
-	cd epub; zip -X ../$@ mimetype
-	cd epub; zip -X ../$@ -r * -x mimetype -x content.opf.src
-
-epub/%.xhtml: %.txt asciidoc_epub.conf bin/pre_epub.js
-	node bin/pre_epub.js $< | asciidoc -f asciidoc_epub.conf --backend=xhtml11 -o $@ -
-
-epub/hints.xhtml: $(foreach CHAP,$(CHAPTERS),$(CHAP).txt) bin/extract_hints.js
-	node bin/extract_hints.js | node bin/pre_epub.js - | asciidoc -f asciidoc_epub.conf --backend=xhtml11 -o $@ -
-
-epubcheck: book.epub
-	epubcheck book.epub 2>&1 | grep -v 'img/.*\.svg'
-
-book.mobi: book.epub img/cover.png
-	ebook-convert book.epub book.mobi --output-profile=kindle --cover=img/cover.png --remove-first-image

bin/check_links.js

@@ -0,0 +1,31 @@
+var fs = require("fs");
+
+var files = Object.create(null);
+fs.readdirSync(".").forEach(function(name) {
+  var m = /^(\d\d.*)\.md$/.exec(name);
+  if (m) files[m[1]] = fs.readFileSync(name, "utf8");
+});
+files["22_fast"] = "{{id fast}}"; // Kludge to recognize bonus chapter
+files["hints"] = "{{id hints}}";
+
+var fail = 0;
+function error(file, msg) {
+  console.error(file + ": " + msg);
+  fail = 1;
+}
+
+var link = /\]\((([^\.\s]+)\.(\w{2,5})#([^\s\[]+?))\)/g, m;
+for (var file in files) {
+  while (m = link.exec(files[file])) {
+    let [_, link, file, ext, anchor] = m
+    if (ext != "html")
+      error(file, "Bad extension: " + link);
+    var target = files[file];
+    if (!target)
+      error(file, "Unknown target file: " + link);
+    else if (anchor != file.slice(3) && target.indexOf("{{id " + anchor + "}}") == -1)
+      error(file, "Non-existing anchor: " + link);
+  }
+}
+
+process.exit(fail);