Initial version of the gh models extension.

Includes basic functionality for:
- Listing available models
- Running inference with a specific model, both in "single-shot" and
  REPL modes.
- Basic support for model parameters.

.github/workflows/release.yml

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+name: release
+on:
+  push:
+    tags:
+      - "v*"
+permissions:
+  contents: write
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: cli/gh-extension-precompile@v1

.gitignore

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+/gh-models
+/gh-models.exe

README.md

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+## GitHub Models extension
+
+Use the GitHub Models service from the CLI!
+
+### Building
+
+Run `script/build`.
+
+### Prerequisites
+
+The extension requires the `gh` CLI to be installed and in the PATH. The extension also requires the user have authenticated via `gh auth`.

cmd/list/list.go

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+package list
+
+import (
+	"io"
+
+	"github.com/cli/go-gh/v2/pkg/auth"
+	"github.com/cli/go-gh/v2/pkg/tableprinter"
+	"github.com/cli/go-gh/v2/pkg/term"
+	"github.com/github/gh-models/internal/azure_models"
+	"github.com/github/gh-models/internal/ux"
+	"github.com/spf13/cobra"
+)
+
+func NewListCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "list",
+		Short: "List available models",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			terminal := term.FromEnv()
+			out := terminal.Out()
+
+			token, _ := auth.TokenForHost("github.com")
+			if token == "" {
+				io.WriteString(out, "No GitHub token found. Please run 'gh auth login' to authenticate.\n")
+				return nil
+			}
+
+			client := azure_models.NewClient(token)
+
+			models, err := client.ListModels()
+			if err != nil {
+				return err
+			}
+
+			ux.SortModels(models)
+
+			width, _, _ := terminal.Size()
+			printer := tableprinter.New(out, terminal.IsTerminalOutput(), width)
+
+			printer.AddHeader([]string{"Name", "Friendly Name", "Publisher"})
+			printer.EndRow()
+
+			for _, model := range models {
+				if !ux.IsChatModel(model) {
+					continue
+				}
+
+				printer.AddField(model.Name)
+				printer.AddField(model.FriendlyName)
+				printer.AddField(model.Publisher)
+				printer.EndRow()
+			}
+
+			err = printer.Render()
+			if err != nil {
+				return err
+			}
+
+			return nil
+		},
+	}
+
+	return cmd
+}

cmd/root.go

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+package cmd
+
+import (
+	"github.com/github/gh-models/cmd/list"
+	"github.com/github/gh-models/cmd/run"
+	"github.com/spf13/cobra"
+)
+
+func NewRootCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "gh models",
+		Short: "GitHub Models extension",
+	}
+
+	cmd.AddCommand(list.NewListCommand())
+	cmd.AddCommand(run.NewRunCommand())
+
+	return cmd
+}