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Svelte: Redirect to new page ID

Suppose

  • that your website has page IDs in the sense of domain.com/PAGEID/slug. For example, you're probably seeing this very page at the address edstrom.dev/csbxq/redirect-to-new-page-ids-in-sveltekit, so the ID is csbxq.
  • that you update the ID to use new algorithm, so now it's going to be 6uXpfOI2c9fJdh2aa22. Time to set up a redirect!

I'll assume your page's loader (the file you've got on a path like src/routes/[id]/[[slug]]/+page.js) contains this: 

import { error } from '$sveltejs/kit'
import posts from '$lib/posts.json'

export function load({ params }) {
    let post = posts[params.id]
    if (post) return post
    
    error(404, "Not found")
}

Edit that to something like this. 

import { error, redirect } from '$sveltejs/kit'
import posts from '$lib/posts.json'
import v1_to_v2 from '$lib/v1_to_v2.json' // assumed a table of old and new ID

export function load({ params }) {
  let post = posts[params.id]
  if (post) return post

  // Redirect from v1 to v2 id
  let idv2 = v1_to_v2[params.id]
  if (idv2) redirect(308, `/${idv2}`)
  
  error(404, "Not found")
}

This assumes that navigating to just domain.com/IDV2 is satisfactory.

To also include the slug in the redirection (remember the slug in domain.com/PAGEID/slug?), I'll assume your post object contains metadata post.id and post.slug and then we can do the redirection like this: 

// ...
export function load({ params }) {
  let post = posts[params.id]
  if (post) return post

  // Redirect from v1 to v2 id
  post = posts[v1_to_v2[params.id]]
  if (post) redirect(308, `/${post.id}/${post.slug}`)

  error(404, "Not found")
}
Created (10 months ago)

Smart tabs in 2024

There is an old little-used #emacs package for smart tabs. All the languages it supports: 

(require 'smart-tabs-mode)
(smart-tabs-insinuate 'c 'c++ 'java 'javascript 'cperl 'python 'ruby 'nxml)
(add-hook 'c-mode-common-hook #'indent-tabs-mode)
(add-hook 'java-mode-hook #'indent-tabs-mode)
(add-hook 'js2-mode-hook #'indent-tabs-mode)
(add-hook 'cperl-mode-hook #'indent-tabs-mode)
(add-hook 'python-mode-hook #'indent-tabs-mode)
(add-hook 'ruby-mode-hook #'indent-tabs-mode)
(add-hook 'nxml-mode-hook #'indent-tabs-mode)

Not much, is it? But that's ok, this way to do it has always been somewhat doomed.

Let's say you share a codebase with people on different platforms. It's not as if you can tell a VSCode person to install the above Emacs-Lisp package.

Autoformatters like gofmt do smart tabs for you these days, and when you can't mandate an autoformatter, the standard way to prevent chaos has been a "spaces only" rule. Maybe when we get an .editorconfig rule for smart tabs (issue 323), this can change?

(Once that's finalized, then Emacs is gonna need a new way more general smart-tabs-mode! Probably based on tree-sitter.)

As far as I can figure, "spaces only" must have been the pragmatic option since the dawn of computing, but maybe the innovations of tree-sitter and editorconfig finally make tabs a real option.

Someone points out that editorconfig's indent_style = tabs rule actually makes no sense if it's not smart tabs anyway, so it shouldn't exist. Makes you think who was using that rule before…

I.e. the choices are:

  • Spaces only: OK
  • Smart tabs: OK
  • Tabs only, used as "wide spaces" assuming they will be rendered at a specific width: no
Created (10 months ago)

Is that function autoloaded yet?

#emacs

Our lab rat today is the builtin ido package. It has a command ido-mode, autoloaded on demand. Now assuming you have not loaded it, check out the return values: 

(featurep 'ido)  ;; => nil
(fboundp 'ido-mode) ;; => t
(autoloadp (symbol-function 'ido-mode)) ;; => t

Then we do M-x load-library ido RET, and see how the return values change. 

(featurep 'ido)  ;; => t
(fboundp 'ido-mode) ;; => t
(autoloadp (symbol-function 'ido-mode)) ;; => nil

TL;DR: to check if ido exists, it's safest to use fboundp on one of its functions.

Created (10 months ago)
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