From a4401b352150205d2f6ee7e3dc99c1145e399c60 Mon Sep 17 00:00:00 2001
From: Kévin Le Gouguec <kevin.legouguec@gmail.com>
Date: Wed, 29 Apr 2020 00:40:14 +0200
Subject: Fix links to internal pages

Replace .md/.org extension with .html.

The output of "make" is now ugly as sin.
---
 repo/www/Makefile                   |  6 +++++-
 repo/www/TODO                       |  1 -
 repo/www/convert-internal-links.lua | 21 +++++++++++++++++++++
 repo/www/generate-index.py          |  5 ++++-
 4 files changed, 30 insertions(+), 3 deletions(-)
 create mode 100644 repo/www/convert-internal-links.lua

(limited to 'repo/www')

diff --git a/repo/www/Makefile b/repo/www/Makefile
index cdc7ee2..db656f2 100644
--- a/repo/www/Makefile
+++ b/repo/www/Makefile
@@ -43,7 +43,10 @@ $(html_folders) $(cache):
 $(pages) $(subindices): $(title)
 
 $(pages): $(OUT_DIR)/%.html:
-	pandoc -s $< -o $@ -T "$$(cat $(title))" -M title="$*"
+	TEXT_FILES="$(TEXT_FILES)"                  \
+	pandoc -s $< -o $@                          \
+		-T "$$(cat $(title))" -M title="$*"     \
+		--lua-filter convert-internal-links.lua
 
 top_index = $(OUT_DIR)/index.html
 subindices = $(filter-out $(top_index),$(indices))
@@ -54,6 +57,7 @@ $(subindices): index_options = --site-title="$$(cat $(title))"
 # ⚠ When tweaking this rule, check whether it still works for the
 #   top-level index.html.
 $(indices): $(OUT_DIR)/%index.html:
+	TEXT_FILES="$(TEXT_FILES)"                                                  \
 	./generate-index.py $(index_options) $(site_tree) "$(patsubst %/,%,$*)" $@
 
 clean:
diff --git a/repo/www/TODO b/repo/www/TODO
index 4ac72db..dd1e670 100644
--- a/repo/www/TODO
+++ b/repo/www/TODO
@@ -1,5 +1,4 @@
 - compute "leak count" on toplevel index
-- lua filter to s/.md/.html on links
 - autogenerate nav
 - autogenerate breadcrumbs
 - get stylin'
diff --git a/repo/www/convert-internal-links.lua b/repo/www/convert-internal-links.lua
new file mode 100644
index 0000000..b0817dd
--- /dev/null
+++ b/repo/www/convert-internal-links.lua
@@ -0,0 +1,21 @@
+EXTENSIONS = {}
+
+string.gsub(
+  os.getenv("TEXT_FILES"),
+  "[^%s]+",
+  function (ext) EXTENSIONS[#EXTENSIONS+1] = ext end
+)
+
+function Link(link)
+  if link.target:match("^[%w]+://")
+  then
+    return link
+  end
+
+  for _, ext in pairs(EXTENSIONS)
+  do
+    link.target = link.target:gsub("%."..ext.."$", ".html")
+  end
+
+  return link
+end
diff --git a/repo/www/generate-index.py b/repo/www/generate-index.py
index 1fb00e6..4353819 100755
--- a/repo/www/generate-index.py
+++ b/repo/www/generate-index.py
@@ -97,7 +97,10 @@ def format_index(target, directories, files):
 
 
 def convert_page(content, output, site_title):
-    pandoc = ('pandoc', '-s', '-o', output)
+    pandoc = (
+        'pandoc', '-s', '--lua-filter', 'convert-internal-links.lua',
+        '-o', output
+    )
     if site_title is not None:
         pandoc += ('-T', site_title)
 
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