feat(comp): Allow fuzzy matching during completion

We had made the assumption that when doing shell completion, we only
needed choices that had for *prefix* what the user had typed.
However, the zsh and fish shells have a more advanced matching system
which first matches on prefix, but if no match is found, then does
more advanced matching attempts, such as sub-strings; fish even matches
on descriptions of completions.

For example,
  helm status nginx<tab>
would match releases such as
  ingress-nginx
  ingress-nginx-release
as long as no release had a prefix of "nginx".

Such fuzzy matching can make completion even more useful for users in
cases where identical prefixes are common.

Signed-off-by: Marc Khouzam <marc.khouzam@montreal.ca>

cmd/helm/docs.go

@@ -69,14 +69,7 @@ func newDocsCmd(out io.Writer) *cobra.Command {
 	f.BoolVar(&o.generateHeaders, "generate-headers", false, "generate standard headers for markdown files")
 
 	cmd.RegisterFlagCompletionFunc("type", func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
-		types := []string{"bash", "man", "markdown"}
-		var comps []string
-		for _, t := range types {
-			if strings.HasPrefix(t, toComplete) {
-				comps = append(comps, t)
-			}
-		}
-		return comps, cobra.ShellCompDirectiveNoFileComp
+		return []string{"bash", "man", "markdown"}, cobra.ShellCompDirectiveNoFileComp
 	})
 
 	return cmd

cmd/helm/docs_test.go

@@ -26,9 +26,9 @@ func TestDocsTypeFlagCompletion(t *testing.T) {
 		cmd:    "__complete docs --type ''",
 		golden: "output/docs-type-comp.txt",
 	}, {
-		name:   "completion for docs --type",
+		name:   "completion for docs --type, no filter",
 		cmd:    "__complete docs --type mar",
-		golden: "output/docs-type-filtered-comp.txt",
+		golden: "output/docs-type-comp.txt",
 	}}
 	runTestCmd(t, tests)
 }

cmd/helm/flags.go

@@ -69,9 +69,7 @@ func bindOutputFlag(cmd *cobra.Command, varRef *output.Format) {
 	err := cmd.RegisterFlagCompletionFunc(outputFlag, func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
 		var formatNames []string
 		for format, desc := range output.FormatsWithDesc() {
-			if strings.HasPrefix(format, toComplete) {
-				formatNames = append(formatNames, fmt.Sprintf("%s\t%s", format, desc))
-			}
+			formatNames = append(formatNames, fmt.Sprintf("%s\t%s", format, desc))
 		}
 
 		// Sort the results to get a deterministic order for the tests
@@ -153,24 +151,21 @@ func compVersionFlag(chartRef string, toComplete string) ([]string, cobra.ShellC
 	var versions []string
 	if indexFile, err := repo.LoadIndexFile(path); err == nil {
 		for _, details := range indexFile.Entries[chartName] {
-			version := details.Metadata.Version
-			if strings.HasPrefix(version, toComplete) {
-				appVersion := details.Metadata.AppVersion
-				appVersionDesc := ""
-				if appVersion != "" {
-					appVersionDesc = fmt.Sprintf("App: %s, ", appVersion)
-				}
-				created := details.Created.Format("January 2, 2006")
-				createdDesc := ""
-				if created != "" {
-					createdDesc = fmt.Sprintf("Created: %s ", created)
-				}
-				deprecated := ""
-				if details.Metadata.Deprecated {
-					deprecated = "(deprecated)"
-				}
-				versions = append(versions, fmt.Sprintf("%s\t%s%s%s", version, appVersionDesc, createdDesc, deprecated))
+			appVersion := details.Metadata.AppVersion
+			appVersionDesc := ""
+			if appVersion != "" {
+				appVersionDesc = fmt.Sprintf("App: %s, ", appVersion)
+			}
+			created := details.Created.Format("January 2, 2006")
+			createdDesc := ""
+			if created != "" {
+				createdDesc = fmt.Sprintf("Created: %s ", created)
+			}
+			deprecated := ""
+			if details.Metadata.Deprecated {
+				deprecated = "(deprecated)"
 			}
+			versions = append(versions, fmt.Sprintf("%s\t%s%s%s", details.Metadata.Version, appVersionDesc, createdDesc, deprecated))
 		}
 	}
 

cmd/helm/flags_test.go

@@ -83,6 +83,13 @@ func outputFlagCompletionTest(t *testing.T, cmdName string) {
 		rels: releasesMockWithStatus(&release.Info{
 			Status: release.StatusDeployed,
 		}),
+	}, {
+		name:   "completion for output flag, no filter",
+		cmd:    fmt.Sprintf("__complete %s --output jso", cmdName),
+		golden: "output/output-comp.txt",
+		rels: releasesMockWithStatus(&release.Info{
+			Status: release.StatusDeployed,
+		}),
 	}}
 	runTestCmd(t, tests)
 }

cmd/helm/history.go

@@ -20,7 +20,6 @@ import (
 	"fmt"
 	"io"
 	"strconv"
-	"strings"
 	"time"
 
 	"github.com/gosuri/uitable"
@@ -191,12 +190,9 @@ func compListRevisions(toComplete string, cfg *action.Configuration, releaseName
 	var revisions []string
 	if hist, err := client.Run(releaseName); err == nil {
 		for _, release := range hist {
-			version := strconv.Itoa(release.Version)
-			if strings.HasPrefix(version, toComplete) {
-				appVersion := fmt.Sprintf("App: %s", release.Chart.Metadata.AppVersion)
-				chartDesc := fmt.Sprintf("Chart: %s-%s", release.Chart.Metadata.Name, release.Chart.Metadata.Version)
-				revisions = append(revisions, fmt.Sprintf("%s\t%s, %s", version, appVersion, chartDesc))
-			}
+			appVersion := fmt.Sprintf("App: %s", release.Chart.Metadata.AppVersion)
+			chartDesc := fmt.Sprintf("Chart: %s-%s", release.Chart.Metadata.Name, release.Chart.Metadata.Version)
+			revisions = append(revisions, fmt.Sprintf("%s\t%s, %s", strconv.Itoa(release.Version), appVersion, chartDesc))
 		}
 		return revisions, cobra.ShellCompDirectiveNoFileComp
 	}

cmd/helm/history_test.go

@@ -95,6 +95,11 @@ func revisionFlagCompletionTest(t *testing.T, cmdName string) {
 		cmd:    fmt.Sprintf("__complete %s musketeers --revision ''", cmdName),
 		rels:   releases,
 		golden: "output/revision-comp.txt",
+	}, {
+		name:   "completion for revision flag, no filter",
+		cmd:    fmt.Sprintf("__complete %s musketeers --revision 1", cmdName),
+		rels:   releases,
+		golden: "output/revision-comp.txt",
 	}, {
 		name:   "completion for revision flag with too few args",
 		cmd:    fmt.Sprintf("__complete %s --revision ''", cmdName),

cmd/helm/install_test.go

@@ -275,6 +275,10 @@ func TestInstallVersionCompletion(t *testing.T) {
 		name:   "completion for install version flag with generate-name",
 		cmd:    fmt.Sprintf("%s __complete install --generate-name testing/alpine --version ''", repoSetup),
 		golden: "output/version-comp.txt",
+	}, {
+		name:   "completion for install version flag, no filter",
+		cmd:    fmt.Sprintf("%s __complete install releasename testing/alpine --version 0.3", repoSetup),
+		golden: "output/version-comp.txt",
 	}, {
 		name:   "completion for install version flag too few args",
 		cmd:    fmt.Sprintf("%s __complete install testing/alpine --version ''", repoSetup),

cmd/helm/list.go

@@ -224,7 +224,14 @@ func compListReleases(toComplete string, ignoredReleaseNames []string, cfg *acti
 	client := action.NewList(cfg)
 	client.All = true
 	client.Limit = 0
-	client.Filter = fmt.Sprintf("^%s", toComplete)
+	// Do not filter so as to get the entire list of releases.
+	// This will allow zsh and fish to match completion choices
+	// on other criteria then prefix.  For example:
+	//   helm status ingress<TAB>
+	// can match
+	//   helm status nginx-ingress
+	//
+	// client.Filter = fmt.Sprintf("^%s", toComplete)
 
 	client.SetStateMask()
 	releases, err := client.Run()

cmd/helm/plugin_list.go

@@ -18,7 +18,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"strings"
 
 	"github.com/gosuri/uitable"
 	"github.com/spf13/cobra"
@@ -82,9 +81,7 @@ func compListPlugins(toComplete string, ignoredPluginNames []string) []string {
 	if err == nil && len(plugins) > 0 {
 		filteredPlugins := filterPlugins(plugins, ignoredPluginNames)
 		for _, p := range filteredPlugins {
-			if strings.HasPrefix(p.Metadata.Name, toComplete) {
-				pNames = append(pNames, fmt.Sprintf("%s\t%s", p.Metadata.Name, p.Metadata.Usage))
-			}
+			pNames = append(pNames, fmt.Sprintf("%s\t%s", p.Metadata.Name, p.Metadata.Usage))
 		}
 	}
 	return pNames

cmd/helm/plugin_test.go

@@ -307,6 +307,11 @@ func TestPluginCmdsCompletion(t *testing.T) {
 		cmd:    "__complete plugin update ''",
 		golden: "output/plugin_list_comp.txt",
 		rels:   []*release.Release{},
+	}, {
+		name:   "completion for plugin update, no filter",
+		cmd:    "__complete plugin update full",
+		golden: "output/plugin_list_comp.txt",
+		rels:   []*release.Release{},
 	}, {
 		name:   "completion for plugin update repetition",
 		cmd:    "__complete plugin update args ''",
@@ -317,6 +322,11 @@ func TestPluginCmdsCompletion(t *testing.T) {
 		cmd:    "__complete plugin uninstall ''",
 		golden: "output/plugin_list_comp.txt",
 		rels:   []*release.Release{},
+	}, {
+		name:   "completion for plugin uninstall, no filter",
+		cmd:    "__complete plugin uninstall full",
+		golden: "output/plugin_list_comp.txt",
+		rels:   []*release.Release{},
 	}, {
 		name:   "completion for plugin uninstall repetition",
 		cmd:    "__complete plugin uninstall args ''",

cmd/helm/pull_test.go

@@ -371,6 +371,10 @@ func TestPullVersionCompletion(t *testing.T) {
 		name:   "completion for pull version flag",
 		cmd:    fmt.Sprintf("%s __complete pull testing/alpine --version ''", repoSetup),
 		golden: "output/version-comp.txt",
+	}, {
+		name:   "completion for pull version flag, no filter",
+		cmd:    fmt.Sprintf("%s __complete pull testing/alpine --version 0.3", repoSetup),
+		golden: "output/version-comp.txt",
 	}, {
 		name:   "completion for pull version flag too few args",
 		cmd:    fmt.Sprintf("%s __complete pull --version ''", repoSetup),

cmd/helm/repo_list.go

@@ -19,7 +19,6 @@ package main
 import (
 	"fmt"
 	"io"
-	"strings"
 
 	"github.com/gosuri/uitable"
 	"github.com/pkg/errors"
@@ -131,9 +130,7 @@ func compListRepos(prefix string, ignoredRepoNames []string) []string {
 	if err == nil && len(f.Repositories) > 0 {
 		filteredRepos := filterRepos(f.Repositories, ignoredRepoNames)
 		for _, repo := range filteredRepos {
-			if strings.HasPrefix(repo.Name, prefix) {
-				rNames = append(rNames, fmt.Sprintf("%s\t%s", repo.Name, repo.URL))
-			}
+			rNames = append(rNames, fmt.Sprintf("%s\t%s", repo.Name, repo.URL))
 		}
 	}
 	return rNames

cmd/helm/repo_remove_test.go

@@ -197,6 +197,10 @@ func TestRepoRemoveCompletion(t *testing.T) {
 		name:   "completion for repo remove",
 		cmd:    fmt.Sprintf("%s __completeNoDesc repo remove ''", repoSetup),
 		golden: "output/repo_list_comp.txt",
+	}, {
+		name:   "completion for repo remove, no filter",
+		cmd:    fmt.Sprintf("%s __completeNoDesc repo remove fo", repoSetup),
+		golden: "output/repo_list_comp.txt",
 	}, {
 		name:   "completion for repo remove repetition",
 		cmd:    fmt.Sprintf("%s __completeNoDesc repo remove foo ''", repoSetup),

cmd/helm/root.go

@@ -106,9 +106,7 @@ func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string
 			nsNames := []string{}
 			if namespaces, err := client.CoreV1().Namespaces().List(context.Background(), metav1.ListOptions{TimeoutSeconds: &to}); err == nil {
 				for _, ns := range namespaces.Items {
-					if strings.HasPrefix(ns.Name, toComplete) {
-						nsNames = append(nsNames, ns.Name)
-					}
+					nsNames = append(nsNames, ns.Name)
 				}
 				return nsNames, cobra.ShellCompDirectiveNoFileComp
 			}
@@ -133,9 +131,7 @@ func newRootCmd(actionConfig *action.Configuration, out io.Writer, args []string
 			&clientcmd.ConfigOverrides{}).RawConfig(); err == nil {
 			comps := []string{}
 			for name, context := range config.Contexts {
-				if strings.HasPrefix(name, toComplete) {
-					comps = append(comps, fmt.Sprintf("%s\t%s", name, context.Cluster))
-				}
+				comps = append(comps, fmt.Sprintf("%s\t%s", name, context.Cluster))
 			}
 			return comps, cobra.ShellCompDirectiveNoFileComp
 		}

cmd/helm/search_repo.go

@@ -312,8 +312,9 @@ func compListCharts(toComplete string, includeFiles bool) ([]string, cobra.Shell
 		}
 		repoWithSlash := fmt.Sprintf("%s/", repo)
 		if strings.HasPrefix(toComplete, repoWithSlash) {
-			// Must complete with charts within the specified repo
-			completions = append(completions, compListChartsOfRepo(repo, toComplete)...)
+			// Must complete with charts within the specified repo.
+			// Don't filter on toComplete to allow for shell fuzzy matching
+			completions = append(completions, compListChartsOfRepo(repo, "")...)
 			noSpace = false
 			break
 		} else if strings.HasPrefix(repo, toComplete) {

cmd/helm/show_test.go

@@ -98,6 +98,10 @@ func TestShowVersionCompletion(t *testing.T) {
 		name:   "completion for show version flag",
 		cmd:    fmt.Sprintf("%s __complete show chart testing/alpine --version ''", repoSetup),
 		golden: "output/version-comp.txt",
+	}, {
+		name:   "completion for show version flag, no filter",
+		cmd:    fmt.Sprintf("%s __complete show chart testing/alpine --version 0.3", repoSetup),
+		golden: "output/version-comp.txt",
 	}, {
 		name:   "completion for show version flag too few args",
 		cmd:    fmt.Sprintf("%s __complete show chart --version ''", repoSetup),

cmd/helm/testdata/output/status-comp.txt

@@ -1,4 +1,5 @@
 aramis	Aramis-chart-0.0.0 -> uninstalled
 athos	Athos-chart-1.2.3 -> deployed
+porthos	Porthos-chart-111.222.333 -> failed
 :4
 Completion ended with directive: ShellCompDirectiveNoFileComp

cmd/helm/upgrade_test.go

@@ -406,6 +406,10 @@ func TestUpgradeVersionCompletion(t *testing.T) {
 		name:   "completion for upgrade version flag",
 		cmd:    fmt.Sprintf("%s __complete upgrade releasename testing/alpine --version ''", repoSetup),
 		golden: "output/version-comp.txt",
+	}, {
+		name:   "completion for upgrade version flag, no filter",
+		cmd:    fmt.Sprintf("%s __complete upgrade releasename testing/alpine --version 0.3", repoSetup),
+		golden: "output/version-comp.txt",
 	}, {
 		name:   "completion for upgrade version flag too few args",
 		cmd:    fmt.Sprintf("%s __complete upgrade releasename --version ''", repoSetup),