Show warning if 0 changeset specs have been created (#342)

* Show warning if 0 changeset specs have been created

* Red exclamation point instead of warning sign

Author: mrnugget

CHANGELOG.md

@@ -22,6 +22,7 @@ All notable changes to `src-cli` are documented in this file.
 - The default behaviour of `src campaigns [preview|apply]` has been changed to retain downloaded archives of repositories for better performance across re-runs of the command. To use the old behaviour and delete the archives use the `-clean-archives` flag. Repository archives are also not stored in the directory for temp data (see `-tmp` flag) anymore but in the cache directory, which can be configured with the `-cache` flag. To manually delete archives between runs, delete the `*.zip` files in the `-cache` directory (see `src campaigns -help` for its default location).
 - `src campaign [preview|apply]` now check whether `git` and `docker` are available before trying to execute a campaign spec's steps. [#326](https://github.com/sourcegraph/src-cli/pull/326)
 - The progress bar displayed by `src campaign [preview|apply]` has been extended by status bars that show which steps are currently being executed for each repository. [#338](https://github.com/sourcegraph/src-cli/pull/338)
+- `src campaign [preview|apply]` now shows a warning when no changeset specs have been created.
 
 ### Fixed
 

cmd/src/campaigns_common.go

@@ -258,19 +258,27 @@ func campaignsExecute(ctx context.Context, out *output.Output, svc *campaigns.Se
 		}()
 	}
 
-	progress := out.Progress([]output.ProgressBar{
-		{Label: "Sending changeset specs", Max: float64(len(specs))},
-	}, nil)
 	ids := make([]campaigns.ChangesetSpecID, len(specs))
-	for i, spec := range specs {
-		id, err := svc.CreateChangesetSpec(ctx, spec)
-		if err != nil {
-			return "", "", err
+
+	if len(specs) > 0 {
+		progress := out.Progress([]output.ProgressBar{
+			{Label: "Sending changeset specs", Max: float64(len(specs))},
+		}, nil)
+		for i, spec := range specs {
+			id, err := svc.CreateChangesetSpec(ctx, spec)
+			if err != nil {
+				return "", "", err
+			}
+			ids[i] = id
+			progress.SetValue(0, float64(i+1))
+		}
+		progress.Complete()
+
+	} else {
+		if len(repos) == 0 {
+			out.WriteLine(output.Linef(output.EmojiWarning, output.StyleWarning, `No changeset specs created`))
 		}
-		ids[i] = id
-		progress.SetValue(0, float64(i+1))
 	}
-	progress.Complete()
 
 	pending = campaignsCreatePending(out, "Creating campaign spec on Sourcegraph")
 	id, url, err := svc.CreateCampaignSpec(ctx, namespace, rawSpec, ids)

internal/output/emoji.go

@@ -3,5 +3,6 @@ package output
 // Standard emoji for use in output.
 const (
 	EmojiFailure = "❌"
+	EmojiWarning = "❗️"
 	EmojiSuccess = "✅"
 )