Suggest typod command names by Levenshtein ditance.

commands/run.go

@@ -1,9 +1,13 @@
 package commands
 
 import (
+	"fmt"
+	"github.com/agnivade/levenshtein"
 	"github.com/distributed-containers-inc/sanic/config"
 	"github.com/distributed-containers-inc/sanic/shell"
 	"github.com/urfave/cli"
+	"sort"
+	"strings"
 )
 
 func runCommandAction(c *cli.Context) error {
@@ -27,6 +31,7 @@ func runCommandAction(c *cli.Context) error {
 	}
 
 	commandName := c.Args().First()
+	var commandNames []string
 	for _, command := range env.Commands {
 		if command.Name == commandName {
 			code, err := s.ShellExec(command.Command, c.Args().Tail())
@@ -35,8 +40,22 @@ func runCommandAction(c *cli.Context) error {
 			}
 			return cli.NewExitError(err.Error(), code)
 		}
+		commandNames = append(commandNames, command.Name)
 	}
-	return cli.NewExitError("Command "+commandName+" was not found in environment "+s.GetSanicEnvironment(), 1)
+	sort.Slice(commandNames, func(i, j int) bool {
+		distI := levenshtein.ComputeDistance(commandNames[i], commandName)
+		distJ := levenshtein.ComputeDistance(commandNames[j], commandName)
+		return distI < distJ
+	})
+	if len(commandNames) > 6 {
+		commandNames = commandNames[:6]
+	}
+	return cli.NewExitError(
+		fmt.Sprintf("Command %s was not found in environment %s. Did you mean one of [%s]?",
+			commandName,
+			s.GetSanicEnvironment(),
+			strings.Join(commandNames, "|"),
+		), 1)
 
 }
 

go.mod

@@ -11,6 +11,7 @@ require (
 	github.com/NYTimes/gziphandler v1.1.1 // indirect
 	github.com/OneOfOne/xxhash v1.2.5 // indirect
 	github.com/PuerkitoBio/purell v1.1.1 // indirect
+	github.com/agnivade/levenshtein v1.0.2
 	github.com/apache/thrift v0.12.0 // indirect
 	github.com/codahale/hdrhistogram v0.0.0-20161010025455-3a0bb77429bd // indirect
 	github.com/containerd/cgroups v0.0.0-20190603164311-51b62d303d38 // indirect

go.sum

@@ -46,6 +46,8 @@ github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdko
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/sarama v1.22.1/go.mod h1:FRzlvRpMFO/639zY1SDxUxkqH97Y0ndM5CbGj6oG3As=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
+github.com/agnivade/levenshtein v1.0.2 h1:xKF7WlEzoa+ZVkzBxy0ukdzI2etYiWGlTPMNTBGncKI=
+github.com/agnivade/levenshtein v1.0.2/go.mod h1:JLvzGblJATanj48SD0YhHTEFGkWvw3ASLFWSiMIFXsE=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/apache/thrift v0.0.0-20161221203622-b2a4d4ae21c7/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=