Add basic completions

[beyang]

Enable using this setting:

  "cody.experimental.suggest": true,
  "cody.keys.openai": "<YOUR_KEY>",

Inline suggestion

Multiple suggestions in a separate buffer

Implementation

• This currently invokes the OpenAI API directly from the extension. We should probably proxy through Sourcegraph when we turn this on by default
• The only context this currently uses is the lines preceding the current cursor position.

Follow-up work / todo

• Explore other context fetching mechanisms
  • Similar code snippets to the lines preceding the cursor, sourced from various places (open tabs, local directory, usage examples of in-scope variables)
  • The lines following the cursor
  • Filenames
• Improve the post-processing so that it prefers to just close the current block of code

App preview:

• Web

Check out the client app preview documentation to learn more.

Test plan

Cody is still experimental. Tested locally.

[github-advanced-security]

You have successfully added a new SonarCloud configuration ``. As part of the setup process, we have scanned this repository and found no existing alerts. In the future, you will see all code scanning alerts on the repository Security tab.

[abeatrix]

Hmmm how do I get the auto-completion to show up in the docs? I tried pressing alt and \ which displays the Completions.md but i didn't get any autocomplete suggestions in the working docs. Am i missing something?

[beyang]

Hmmm how do I get the auto-completion to show up in the docs? I tried pressing alt and \ which displays the Completions.md but i didn't get any autocomplete suggestions in the working docs. Am i missing something?

VS Code calls these "inline suggestions", and it's a different command (Cmd-Shift-P > Trigger Inline Suggestion).

[beyang]

Making this a draft PR while I port over to the chatgpt turbo now that openai is sunsetting codex

[sqs]

I am very eager to get this merged and start trying it out

[sqs]

jinx...commented at the same time, I guess we are both eager :)

[beyang]

@abeatrix can I get a re-review?

[abeatrix]

Looks good to me + the auto completion works for me.
I played around CompletionItemProvider and InlineCompletionItemProvider and thought CompletionItemProvider was nicer initially since it didn't require users to trigger manually, but I do see the appeal of having suggestions display in-line 🤔

Update: scratch that, I think calling it manually is better

[abeatrix]

What do you think about replacing InlineCompletionItem with CompletionItem?

The InlineCompletionItem works, but require users to trigger it manually with workspace command:

I tried replacing InlineCompletionItem with CompletionItem which allows suggestion to trigger on keypresses. Here I've configured it to trigger on space, tab, and enter keys:

[sqs]

@beyang when you gonna merge this?