From 59be1e500a24c9e7970fabcc97bad5280300061c Mon Sep 17 00:00:00 2001 From: Valentin Gagarin Date: Mon, 5 Sep 2022 22:37:22 +0200 Subject: [PATCH] generalize anchor redirects renaming section headers and changing manually set `id`s will break URLs in the wild. this change allows keeping track of all changes to ensure backwards compatibility. --- doc/manual/redirects.js | 735 ++++++++++++++++++++++------------------ 1 file changed, 409 insertions(+), 326 deletions(-) diff --git a/doc/manual/redirects.js b/doc/manual/redirects.js index 167e221b8..45fbfffab 100644 --- a/doc/manual/redirects.js +++ b/doc/manual/redirects.js @@ -1,330 +1,413 @@ -// Redirects from old DocBook manual. +// Redirect rules for anchors ensure backwards compatibility of URLs. +// This must be done on the client side, as web servers do not see the anchor part of the URL. + +// Redirections are declared as follows: +// Each entry has as key the matched URL path relative to the mdBook document root. +// Each entry is a set of key-value pairs, where +// - keys are anchors on to the matched path. +// - values are redirection targets relative to the current path. + var redirects = { - "#part-advanced-topics": "advanced-topics/advanced-topics.html", - "#chap-tuning-cores-and-jobs": "advanced-topics/cores-vs-jobs.html", - "#chap-diff-hook": "advanced-topics/diff-hook.html", - "#check-dirs-are-unregistered": "advanced-topics/diff-hook.html#check-dirs-are-unregistered", - "#chap-distributed-builds": "advanced-topics/distributed-builds.html", - "#chap-post-build-hook": "advanced-topics/post-build-hook.html", - "#chap-post-build-hook-caveats": "advanced-topics/post-build-hook.html#implementation-caveats", - "#part-command-ref": "command-ref/command-ref.html", - "#conf-allow-import-from-derivation": "command-ref/conf-file.html#conf-allow-import-from-derivation", - "#conf-allow-new-privileges": "command-ref/conf-file.html#conf-allow-new-privileges", - "#conf-allowed-uris": 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Path `b` can have an have an arbitrary prefix. + // + // 2. `path_to_root` consists only of `../`s and determines the depth + // of `b` relative to the prefix: + // + // `document.location.pathname` + // |-----------------------------| + // //[[.html]][#] + // |----| + // `path_to_root` has same number of segments + // + // 3. The following paths are equivalent: + // + // foo/bar/ + // foo/bar/index.html + // foo/bar/index + // + // 4. The following paths are also equivalent: + // + // foo/bar/baz + // foo/bar/baz.html + // + // We can use `path_to_root` to discern prefix from path. + // + // The last element of the following split is always empty. + // Example: '../../'.split('/') -> [ '..', '..', '' ] + const depth = path_to_root.split('/').length - 1; + var segmentsB = b.split('/'); + // get file name of `b` + const fileB = segmentsB.pop(); // mutates `segmentsB`! + // get path of `b` without prefix and file name + const pathB = segmentsB.slice(segmentsB.length - depth).join('/'); + + var segmentsA = a.split('/'); + const fileA = segmentsA.pop(); // mutates `segmentsA`! + const pathA = segmentsA.join('/') + + function normalize(file) { + if (file === '') { return "index.html"; } + if (!file.endsWith('.html')) { return file + '.html'; } + return file; + } + + return pathA === pathB && normalize(fileA) === normalize(fileB); +} + +// The anchor starts with the hash character (`#`), +// but our redirect declarations don't, so we strip it. +// Example: document.location.hash -> '#foo' +const anchor = document.location.hash.substring(1); + +for (const [path, redirect] of Object.entries(redirects)) { + // The global variable `path_to_root` is set by `mdBook`: + // + // > This is a path containing exclusively `../`'s that points to the root of the + // > book from the current file. Since the original directory structure is + // > maintained, it is useful to prepend relative links with this `path_to_root`. + // + // Source: https://phaiax.github.io/mdBook/format/theme/index-hbs.html#data + if (pathsMatch(path, document.location.pathname, path_to_root) && redirect[anchor]) { + document.location.href = redirect[anchor]; + break; + } }