From 65f299a8b89e8423a271b48116b178fb1d08bf31 Mon Sep 17 00:00:00 2001
From: Volpeon <git@volpeon.ink>
Date: Fri, 28 May 2021 17:51:16 +0200
Subject: Use pandoc.path to compute URLs

---
 scripts/metadata_filter.lua | 43 +++++--------------------------------------
 1 file changed, 5 insertions(+), 38 deletions(-)

diff --git a/scripts/metadata_filter.lua b/scripts/metadata_filter.lua
index 6c3817a..895139d 100644
--- a/scripts/metadata_filter.lua
+++ b/scripts/metadata_filter.lua
@@ -1,3 +1,5 @@
+local path = require 'pandoc.path'
+
 function format_date(date)
     if not date then return date end
 
@@ -55,51 +57,16 @@ function group_by(l, field, insert)
     return groups
 end
 
-function splitstr(input, sep)
-    sep = sep or "%s"
-    local t = {}
-    for str in input:gmatch("([^" .. sep .. "]+)") do table.insert(t, str) end
-    return t
-end
-
-function relative_to(dir, target)
-    dir = splitstr(dir, "/")
-    target = splitstr(target, "/")
-
-    local prefix = true
-    local path = ""
-
-    for i = 1, math.min(#dir, #target) do
-        local t = target[i]
-        if prefix then
-            if dir[i] ~= t then
-                prefix = false
-                path = "../" .. t
-            end
-        else
-            path = "../" .. path .. "/" .. t
-        end
-    end
-
-    if #dir < #target then
-        for i = #dir + 1, #target do path = path .. (path == "" and "" or "/") .. target[i] end
-    elseif #dir > #target then
-        for _ = #target + 1, #dir do path = "../" .. path end
-    end
-
-    return path
-end
-
 function make_absolute(rel, base)
-    return rel:find("^/") and rel or base:gsub("^(.*)/.-$", "%1") .. "/" .. rel
+    return path.is_absolute(rel) and rel or path.join({ path.directory(base), rel })
 end
 
 function resolve_url(site_url, ref_file, target_file)
     target_file = target_file:gsub("/index%.html$", "/")
 
-    local ref_base_dir = ref_file:gsub("^(.*)/.-$", "%1")
+    local ref_base_dir = path.directory(ref_file)
     local abs = target_file
-    local rel = relative_to(ref_base_dir, abs):gsub("/index%.html$", "/")
+    local rel = path.make_relative(abs, ref_base_dir, true)
 
     return { abs = abs, rel = rel, full = (site_url .. abs) }
 end
-- 
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