add basic completions

client/cody/package.json

@@ -107,6 +107,10 @@
       {
         "command": "cody.delete-access-token",
         "title": "Cody: Delete Access Token"
+      },
+      {
+        "command": "cody.experimental.suggest",
+        "title": "Ask Cody: View Suggestions"
       }
     ],
     "keybindings": [
@@ -115,6 +119,11 @@
         "key": "ctrl+alt+c",
         "mac": "ctrl+alt+c",
         "when": "cody.activated"
+      },
+      {
+        "command": "cody.experimental.suggest",
+        "key": "alt+\\",
+        "when": "sourcegraph.cody.activated"
       }
     ],
     "submenus": [
@@ -218,6 +227,9 @@
             "blended"
           ],
           "default": "embeddings"
+        },
+        "cody.keys.openai": {
+          "type": "string"
         }
       }
     }

client/cody/src/command/CommandsProvider.ts

@@ -1,6 +1,9 @@
+import * as openai from 'openai'
 import * as vscode from 'vscode'
 
 import { ChatViewProvider } from '../chat/ChatViewProvider'
+import { CodyCompletionItemProvider } from '../completions'
+import { CompletionsDocumentProvider } from '../completions/docprovider'
 import { getConfiguration } from '../configuration'
 import { ExtensionApi } from '../extension-api'
 
@@ -96,6 +99,25 @@ export const CommandsProvider = async (context: vscode.ExtensionContext): Promis
         )
     )
 
+    if (config.experimentalSuggest && config.openaiKey) {
+        const configuration = new openai.Configuration({
+            apiKey: config.openaiKey,
+        })
+        const openaiApi = new openai.OpenAIApi(configuration)
+        const docprovider = new CompletionsDocumentProvider()
+        vscode.workspace.registerTextDocumentContentProvider('cody', docprovider)
+
+        const completionsProvider = new CodyCompletionItemProvider(openaiApi, docprovider)
+        context.subscriptions.push(
+            vscode.commands.registerCommand('cody.experimental.suggest', async () => {
+                await completionsProvider.fetchAndShowCompletions()
+            })
+        )
+        context.subscriptions.push(
+            vscode.languages.registerInlineCompletionItemProvider({ scheme: 'file' }, completionsProvider)
+        )
+    }
+
     // Watch all relevant configuration and secrets for changes.
     context.subscriptions.push(
         vscode.workspace.onDidChangeConfiguration(async event => {

client/cody/src/completions/docprovider.ts

@@ -0,0 +1,104 @@
+import * as openai from 'openai'
+import * as vscode from 'vscode'
+
+// FIXME: When OpenAI's logit_bias uses a more precise type than 'object',
+// specify JSON-able objects as { [prop: string]: JSONSerialiable | undefined }
+export type JSONSerializable = null | string | number | boolean | object | JSONSerializable[]
+
+interface Meta {
+    elapsedMillis: number
+    prompt: string
+    suffix: string
+    llmOptions: JSONSerializable
+}
+
+export interface CompletionGroup {
+    lang: string
+    prefixText: string
+    completions: openai.CreateChatCompletionResponse
+    meta?: Meta
+}
+
+export class CompletionsDocumentProvider implements vscode.TextDocumentContentProvider {
+    private completionsByUri: { [uri: string]: CompletionGroup[] } = {}
+
+    private isDebug(): boolean {
+        return vscode.workspace.getConfiguration().get<boolean>('cody.debug') === true
+    }
+
+    private fireDocumentChanged(uri: vscode.Uri): void {
+        this.onDidChangeEmitter.fire(uri)
+    }
+
+    public clearCompletions(uri: vscode.Uri): void {
+        delete this.completionsByUri[uri.toString()]
+        this.fireDocumentChanged(uri)
+    }
+
+    public addCompletions(
+        uri: vscode.Uri,
+        lang: string,
+        prefixText: string,
+        completions: openai.CreateChatCompletionResponse,
+        debug?: Meta
+    ): void {
+        if (!this.completionsByUri[uri.toString()]) {
+            this.completionsByUri[uri.toString()] = []
+        }
+
+        this.completionsByUri[uri.toString()].push({
+            lang,
+            prefixText,
+            completions,
+            meta: debug,
+        })
+        this.fireDocumentChanged(uri)
+    }
+
+    public onDidChangeEmitter = new vscode.EventEmitter<vscode.Uri>()
+    public onDidChange = this.onDidChangeEmitter.event
+
+    public provideTextDocumentContent(uri: vscode.Uri): string {
+        const completionGroups = this.completionsByUri[uri.toString()]
+        if (!completionGroups) {
+            return 'Loading...'
+        }
+
+        return completionGroups
+            .map(({ completions, lang, prefixText, meta }) =>
+                completions.choices
+                    .map(({ message, finish_reason }, index) => {
+                        if (!message?.content) {
+                            return undefined
+                        }
+
+                        let completionText = `\`\`\`${lang}\n${prefixText}${message.content}\n\`\`\``
+                        if (this.isDebug() && meta) {
+                            completionText =
+                                `\`\`\`\n${meta.prompt}\n\`\`\`` +
+                                '\n' +
+                                completionText +
+                                '\n' +
+                                `\`\`\`\n${meta.suffix}\n\`\`\``
+                        }
+                        const headerComponents = [`${index + 1} / ${completions.choices.length}`]
+                        if (finish_reason) {
+                            headerComponents.push(`finish_reason:${finish_reason}`)
+                        }
+                        return headerize(headerComponents.join(', '), 80) + '\n' + completionText
+                    })
+                    .filter(t => t)
+                    .join('\n\n')
+            )
+            .join('\n\n')
+    }
+}
+
+function headerize(label: string, width: number): string {
+    const prefix = '# ======= '
+    let buffer = width - label.length - prefix.length - 1
+    if (buffer < 0) {
+        buffer = 0
+    }
+    return `${prefix}${label} ${'='.repeat(buffer)}`
+}