Vlada:
I think this is a great idea for improving the usability of manage.py,
especially for newcomers. When I looked your current implementation used a
simple 'in' to find suggestions, but this is not great for the most
obvious/common use case: typos.
I would strongly advocate for using the levenshtein distance algorithm if
this does get merged, there are some simple and succinct python
implementations we can use, and the algorithm itself is what git uses to
suggest commands (and I've always found that quite good).
Brice:
You are right in that this is a case that could happen in part due to this
feature, but it's a long shot and IMO the benefits outweigh the risks. This
can happen without this feature anyway - if someone is typing in random
manage.py commands without thinking then issues can and will arise. The
only preventative measure we could take would be to add an "are you sure?"
prompt after every manage.py invocation which is not a great idea overall.
For newcomers though this could be great, seeing the 'command not found'
message can be confusing and unhelpful, any help we can add to that is a
good thing IMO. Adding stars to the command invocation can be even more
confusing as users have to escape them (and if they don't they could end up
running random commands) and it's not terribly nice UI wise.
Built in shell autocompletion would be the best way forward in this case,
at least for non-windows users. Kubectl has a nice way of doing this:
source <(kubectl completion bash|zsh). Maybe something like this could be
adapted for manage.py?
On 17 Jul 2017 08:49, "Brice PARENT" <cont...@brice.xyz> wrote:
Hi!
I'm not sure how I feel about that. It feels like a good idea at first, but
it might lead to dangerous behaviours.
Let me explain my thought: having such a feature would encourage people to
use it (of course). Doing so can lead so side effects. For example, if, in
a project you're working on, you want to use a custom management command
named "migrate_data_to_other_server", you might end up typing "./manage.oy
migrate" in hope for the system to display the exact name that you probably
have forgotten. But it won't, it will migrate your database instead. What I
mean is that executing commands that shouldn't work on purpose might lead
to executing the wrong command instead. And management commands might be
dangerous if not used at the right time (I've seen management commands
being used to push code to production for example. Executing them by error
in a dev environment might be a real issue!).
I'd prefer to encourage the use of "./manage.py help", which lists all
available commands, or use masks when searching for a command ("./manage.py
migrate*"). When you want to look for the name of a command, you'd know
that adding a star somewhere won't execute anything other than listing
available commands matching the value you just gave. And every developer
knows (I think) how to use wildcards.
-Brice
Le 15/07/17 à 18:36, Vláďa Macek a écrit :
Hi everyone,
I had an idea that would save me time working with Django:
The manage.py wouldn't only print "Unknown command" when incomplete
subcommand name given, but also print those available by substring search.
https://code.djangoproject.com/ticket/28398
I added a screenshot and a patch there.
In my opinion, such first implementation could be as simple as that.
Smarter versions may come later.
As suggested by Tim Graham (thanks, Tim), I resort here for opinions.
Thank you,
Vlada Macek
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