From 8692dba921531783b9204a9323db2aba640fe978 Mon Sep 17 00:00:00 2001
From: Kévin Le Gouguec <kevin.legouguec@gmail.com>
Date: Mon, 20 Apr 2020 00:03:16 +0200
Subject: Parse site title from top-level README

Maybe not the best idea, since the dependency chain will trigger a
site-wide rebuild everytime the README is edited.  Ah well.
---
 repo/www/Makefile        | 15 ++++++++++-----
 repo/www/print-title.lua | 26 ++++++++++++++++++++++++++
 2 files changed, 36 insertions(+), 5 deletions(-)
 create mode 100644 repo/www/print-title.lua

(limited to 'repo/www')

diff --git a/repo/www/Makefile b/repo/www/Makefile
index fb933c8..c236936 100644
--- a/repo/www/Makefile
+++ b/repo/www/Makefile
@@ -1,24 +1,27 @@
 TOP_DIR = ../..
 OUT_DIR = $(TOP_DIR)/public
 TEXT_FILES = md org
-# make does not care about unpaired single quotes (nor double quotes
-# for that matter) but Emacs does.  Shell out.
-TITLE = $(shell echo "peniblec's memleaks")
 
 dirname = $(patsubst %/,%,$(dir $(1)))
 dirnames = $(sort $(call dirname,$(1)))
 
 text_patterns = $(foreach ext,$(TEXT_FILES),'$(TOP_DIR)/**.$(ext)')
 text_folders = $(call dirnames,$(shell git ls-files $(text_patterns)))
+top_readme = $(shell git ls-files $(addprefix $(TOP_DIR)/README.,$(TEXT_FILES)))
 
 all: site
 
 cache = .cache
+# Site title, parsed from the top-level README.
+title = $(cache)/title
 # Maps folders to their contents (files and subfolders).
 site_tree = $(cache)/site-tree.json
 # Defines $(pages) and $(indices).
 dependencies = $(cache)/deps.mk
 
+$(title): $(top_readme) | $(cache)
+	pandoc --lua-filter print-title.lua $< > $@
+
 $(site_tree): $(text_folders) | $(cache)
 	./generate-tree.py -o $@ $(TEXT_FILES)
 
@@ -37,13 +40,15 @@ html_folders = $(call dirnames,$(pages) $(indices))
 $(html_folders) $(cache):
 	mkdir -p $@
 
+$(pages) $(indices): $(title)
+
 $(pages): $(OUT_DIR)/%.html:
-	pandoc -s $< -o $@ -T "$(TITLE)" -M title="$*"
+	pandoc -s $< -o $@ -T "$$(cat $(title))" -M title="$*"
 
 # ⚠ When tweaking this rule, check whether it still works for the
 #   top-level index.html.
 $(indices): $(OUT_DIR)/%index.html:
-	./generate-index.py $(site_tree) "$(TITLE)" "$(patsubst %/,%,$*)" $@
+	./generate-index.py $(site_tree) "$$(cat $(title))" "$(patsubst %/,%,$*)" $@
 
 clean:
 	-rm $(dependencies)
diff --git a/repo/www/print-title.lua b/repo/www/print-title.lua
new file mode 100644
index 0000000..c2c90fb
--- /dev/null
+++ b/repo/www/print-title.lua
@@ -0,0 +1,26 @@
+title = ''
+
+titlefilter = {
+  Str = function (element)
+    title = title .. element.text
+  end,
+
+  Code = function (element)
+    title = title .. element.text
+  end,
+
+  Space = function (element)
+    title = title .. ' '
+  end,
+}
+
+function Pandoc(doc)
+  pandoc.List.map(
+    doc.meta.title,
+    function (inline)
+      pandoc.walk_inline(pandoc.Span(inline), titlefilter)
+    end
+  )
+  print(title)
+  os.exit(0)
+end
-- 
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