doc: add gif for command line in readme (#4012)

README.md

@@ -16,16 +16,23 @@ CDS is an Enterprise-Grade Continuous Delivery & DevOps Automation Platform writ
 ## Intuitive UI
 CDS provides an intuitive UI that allows you to build complex workflows, run them and dig into the logs when needed.
 
-<kbd>
-  <img src="./docs/static/images/capture-start.gif" alt="CDS Demonstration">
-</kbd>
+<p align="center">
+  <kbd>
+    <img src="./docs/static/images/capture-start.gif" alt="create and run workflow with CDS ui" title="create and run workflow with CDS ui"> 
+  </kbd>
+  <i>Create and run workflow with CDS ui.</i>
+</p>
 
 ## The most powerful Command Line for a CI/CD Platform
 
 cdsctl is the CDS Command Line - you can script everything with it, cdsctl also provide some cool commands such as `cdsctl shell` to browse your projects and workflows without the need to open a browser.
 
 [See all cdsctl commands](https://ovh.github.io/cds/cli/cdsctl/#see-also)
 
+<p align="center">
+  <img src="./docs/static/images/init_template_as_code.gif" alt="create workflow as code with CDS command line" title="create workflow as code with CDS command line">
+  <i>Create workflow as code with CDS command line.</i>
+</p>
 
 ## Want a try?
 

cli/cdsctl/config.go

@@ -8,6 +8,7 @@ import (
 
 	"github.com/dgrijalva/jwt-go"
 	"github.com/fsamin/go-repo"
+	"github.com/pkg/errors"
 
 	"github.com/ovh/cds/cli"
 	"github.com/ovh/cds/sdk"
@@ -192,11 +193,11 @@ func discoverConf(ctx []cli.Arg) ([]string, error) {
 		if needConfirmation {
 			fetchURL, err := r.FetchURL()
 			if err != nil {
-				return nil, err
+				return nil, errors.Wrap(err, "cannot get url from local git repository")
 			}
 			name, err := r.Name()
 			if err != nil {
-				return nil, err
+				return nil, errors.Wrap(err, "cannot get name from local git repository")
 			}
 			repoExists = cli.AskForConfirmation(fmt.Sprintf("Detected repository as %s (%s). Is it correct?", name, fetchURL))
 		}
@@ -227,7 +228,7 @@ func discoverConf(ctx []cli.Arg) ([]string, error) {
 		if repoExists {
 			name, err := r.Name()
 			if err != nil {
-				return nil, err
+				return nil, errors.Wrap(err, "cannot get name from current repository")
 			}
 			ps, err := client.ProjectList(true, true, cdsclient.Filter{Name: "repo", Value: name})
 			if err != nil {
@@ -267,7 +268,7 @@ func discoverConf(ctx []cli.Arg) ([]string, error) {
 				if !cli.AskForConfirmation(fmt.Sprintf("Found one CDS project '%s - %s'. Is it correct?", projects[0].Key, projects[0].Name)) {
 					// there is no filter on repo so there was only one choice possible
 					if !repoExists {
-						return nil, fmt.Errorf("Can't find a project to use")
+						return nil, errors.New("can't find a project to use")
 					}
 				} else {
 					project = &projects[0]
@@ -296,7 +297,7 @@ func discoverConf(ctx []cli.Arg) ([]string, error) {
 		projectKey = project.Key
 		if repoExists {
 			if err := r.LocalConfigSet("cds", "project", projectKey); err != nil {
-				return nil, err
+				return nil, errors.Wrap(err, "cannot set local git configuration")
 			}
 		}
 
@@ -325,15 +326,15 @@ func discoverConf(ctx []cli.Arg) ([]string, error) {
 				}
 			}
 			if application == nil && !mctx[_ApplicationName].AllowEmpty {
-				return nil, fmt.Errorf("Can't find an application to use")
+				return nil, errors.New("can't find an application to use")
 			}
 
 			// set application name and override repository config if exists
 			applicationName = application.Name
 			if application != nil {
 				if repoExists {
 					if err := r.LocalConfigSet("cds", "application", applicationName); err != nil {
-						return nil, err
+						return nil, errors.Wrap(err, "cannot set local git configuration")
 					}
 				}
 			}
@@ -364,15 +365,15 @@ func discoverConf(ctx []cli.Arg) ([]string, error) {
 				}
 			}
 			if workflow == nil && !mctx[_WorkflowName].AllowEmpty {
-				return nil, fmt.Errorf("Can't find a workflow to use")
+				return nil, errors.New("can't find a workflow to use")
 			}
 
 			// set workflow name and override repository config if exists
 			if workflow != nil {
 				workflowName = workflow.Name
 				if repoExists {
 					if err := r.LocalConfigSet("cds", "workflow", workflowName); err != nil {
-						return nil, err
+						return nil, errors.Wrap(err, "cannot set local git configuration")
 					}
 				}
 			}

cli/cobra.go

@@ -208,7 +208,7 @@ func newCommand(c Command, run interface{}, subCommands SubCommands, mods ...Com
 	cmd.Run = func(cmd *cobra.Command, args []string) {
 		if c.PreRun != nil {
 			if err := c.PreRun(&c, &args); err != nil {
-				ExitOnError(ErrWrongUsage, cmd.Help)
+				ExitOnError(err)
 				return
 			}
 		}