diff --git a/cmd/tk/debug.go b/cmd/tk/debug.go
index ac821adab..838869af2 100644
--- a/cmd/tk/debug.go
+++ b/cmd/tk/debug.go
@@ -23,6 +23,9 @@ func jpathCmd() *cobra.Command {
 		Short: "print information about the jpath",
 		Use:   "jpath [directory]",
 		Args:  cobra.ExactArgs(1),
+		Annotations: map[string]string{
+			"args": "baseDir",
+		},
 		Run: func(cmd *cobra.Command, args []string) {
 			pwd, err := filepath.Abs(args[0])
 			if err != nil {
diff --git a/cmd/tk/init.go b/cmd/tk/init.go
index fe46baf43..c86240440 100644
--- a/cmd/tk/init.go
+++ b/cmd/tk/init.go
@@ -15,6 +15,7 @@ func initCmd() *cobra.Command {
 	cmd := &cobra.Command{
 		Use:   "init",
 		Short: "Create the directory structure",
+		Args:  cobra.NoArgs,
 	}
 	force := cmd.Flags().BoolP("force", "f", false, "ignore the working directory not being empty")
 	cmd.Run = func(cmd *cobra.Command, args []string) {
diff --git a/cmd/tk/jsonnet.go b/cmd/tk/jsonnet.go
index 421f0ac42..09bbdbafc 100644
--- a/cmd/tk/jsonnet.go
+++ b/cmd/tk/jsonnet.go
@@ -17,6 +17,9 @@ func evalCmd() *cobra.Command {
 		Short: "evaluate the jsonnet to json",
 		Use:   "eval [directory]",
 		Args:  cobra.ExactArgs(1),
+		Annotations: map[string]string{
+			"args": "baseDir",
+		},
 	}
 
 	cmd.Run = func(cmd *cobra.Command, args []string) {
diff --git a/cmd/tk/main.go b/cmd/tk/main.go
index dd8e7eab4..e290d9aa3 100644
--- a/cmd/tk/main.go
+++ b/cmd/tk/main.go
@@ -1,12 +1,15 @@
 package main
 
 import (
+	"flag"
 	"log"
 	"path/filepath"
 
+	"github.com/posener/complete"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 
+	"github.com/sh0rez/tanka/pkg/cmp"
 	"github.com/sh0rez/tanka/pkg/config/v1alpha1"
 	"github.com/sh0rez/tanka/pkg/kubernetes"
 )
@@ -34,41 +37,15 @@ func main() {
 		Short:            "tanka <3 jsonnet",
 		Version:          Version,
 		TraverseChildren: true,
+		// Configuration
 		PersistentPreRun: func(cmd *cobra.Command, args []string) {
-			// Configuration parsing. Note this is using return to abort actions
-			viper.SetConfigName("spec")
-
-			// no args = no command that has a baseDir passed, abort
 			if len(args) == 0 {
 				return
 			}
-
-			// if the first arg is not a dir, abort
-			pwd, err := filepath.Abs(args[0])
-			if err != nil {
+			config = setupConfiguration(args[0])
+			if config == nil {
 				return
 			}
-			viper.AddConfigPath(pwd)
-
-			// handle deprecated ksonnet spec
-			for old, new := range deprecated {
-				viper.RegisterAlias(new, old)
-			}
-
-			// read it
-			if err := viper.ReadInConfig(); err != nil {
-				// just run fine without config. Provider features won't work (apply, show, diff)
-				if _, ok := err.(viper.ConfigFileNotFoundError); ok {
-					return
-				}
-
-				log.Fatalln(err)
-			}
-			checkDeprecated()
-
-			if err := viper.Unmarshal(&config); err != nil {
-				log.Fatalln(err)
-			}
 
 			// Kubernetes
 			kube = kubernetes.New(config.Spec)
@@ -94,14 +71,66 @@ func main() {
 		debugCmd(),
 	)
 
-	// other commands
-	rootCmd.AddCommand(completionCommand(rootCmd))
+	// completion
+	cmp.Handlers.Add("baseDir", complete.PredictFunc(
+		func(complete.Args) []string {
+			return findBaseDirs()
+		},
+	))
+
+	c := complete.New("tk", cmp.Create(rootCmd))
+	c.InstallName = "install-completion"
+	c.UninstallName = "uninstall-completion"
+	fs := &flag.FlagSet{}
+	c.AddFlags(fs)
+	rootCmd.Flags().AddGoFlagSet(fs)
+
+	rootCmd.Run = func(cmd *cobra.Command, args []string) {
+		if c.Complete() {
+			return
+		}
+		_ = cmd.Help()
+	}
 
 	// Run!
 	if err := rootCmd.Execute(); err != nil {
 		log.Fatalln("Ouch:", rootCmd.Execute())
 	}
 }
+
+func setupConfiguration(baseDir string) *v1alpha1.Config {
+	viper.SetConfigName("spec")
+
+	// if the baseDir arg is not a dir, abort
+	pwd, err := filepath.Abs(baseDir)
+	if err != nil {
+		return nil
+	}
+	viper.AddConfigPath(pwd)
+
+	// handle deprecated ksonnet spec
+	for old, new := range deprecated {
+		viper.RegisterAlias(new, old)
+	}
+
+	// read it
+	if err := viper.ReadInConfig(); err != nil {
+		// just run fine without config. Provider features won't work (apply, show, diff)
+		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
+			return nil
+		}
+
+		log.Fatalln(err)
+	}
+	checkDeprecated()
+
+	var config v1alpha1.Config
+	if err := viper.Unmarshal(&config); err != nil {
+		log.Fatalln(err)
+	}
+	return &config
+}
+
 func checkDeprecated() {
 	for old, use := range deprecated {
 		if viper.IsSet(old) {
diff --git a/cmd/tk/other.go b/cmd/tk/other.go
index 1c6b822d6..17ea3f550 100644
--- a/cmd/tk/other.go
+++ b/cmd/tk/other.go
@@ -1,31 +1,31 @@
 package main
 
 import (
-	"fmt"
+	"log"
 	"os"
-	"strings"
+	"path/filepath"
 
-	"github.com/spf13/cobra"
+	"github.com/sh0rez/tanka/pkg/jpath"
 )
 
-func completionCommand(rootCmd *cobra.Command) *cobra.Command {
-	return &cobra.Command{
-		Use: "completion bash|zsh",
-		Example: `
-  eval "$(tk completion bash)"
-  eval "$(tk completion zsh)"
-		`,
-		Short: `create bash/zsh auto-completion.`,
-		Args:  cobra.ExactArgs(1),
-		RunE: func(cmd *cobra.Command, args []string) error {
-			switch shell := strings.ToLower(args[0]); shell {
-			case "bash":
-				return rootCmd.GenBashCompletion(os.Stdout)
-			case "zsh":
-				return rootCmd.GenZshCompletion(os.Stdout)
-			default:
-				return fmt.Errorf("unknown shell %q. Only bash and zsh are supported", shell)
-			}
-		},
+// findBaseDirs searches for possible environments
+func findBaseDirs() (dirs []string) {
+	pwd, err := os.Getwd()
+	if err != nil {
+		return
 	}
+	_, _, _, err = jpath.Resolve(pwd)
+	if err == jpath.ErrorNoRoot {
+		return
+	}
+
+	if err := filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
+		if _, err := os.Stat(filepath.Join(path, "main.jsonnet")); err == nil {
+			dirs = append(dirs, path)
+		}
+		return nil
+	}); err != nil {
+		log.Fatalln(err)
+	}
+	return dirs
 }
diff --git a/cmd/tk/workflow.go b/cmd/tk/workflow.go
index 41931f806..8a845856a 100644
--- a/cmd/tk/workflow.go
+++ b/cmd/tk/workflow.go
@@ -15,6 +15,9 @@ func applyCmd() *cobra.Command {
 		Use:   "apply [directory]",
 		Short: "apply the configuration to the cluster",
 		Args:  cobra.ExactArgs(1),
+		Annotations: map[string]string{
+			"args": "baseDir",
+		},
 	}
 	cmd.Run = func(cmd *cobra.Command, args []string) {
 		raw, err := evalDict(args[0])
@@ -39,6 +42,9 @@ func diffCmd() *cobra.Command {
 		Use:   "diff [directory]",
 		Short: "differences between the configuration and the cluster",
 		Args:  cobra.ExactArgs(1),
+		Annotations: map[string]string{
+			"args": "baseDir",
+		},
 	}
 	cmd.Run = func(cmd *cobra.Command, args []string) {
 		raw, err := evalDict(args[0])
@@ -72,6 +78,9 @@ func showCmd() *cobra.Command {
 		Use:   "show [directory]",
 		Short: "jsonnet as yaml",
 		Args:  cobra.ExactArgs(1),
+		Annotations: map[string]string{
+			"args": "baseDir",
+		},
 	}
 	cmd.Run = func(cmd *cobra.Command, args []string) {
 		raw, err := evalDict(args[0])
diff --git a/go.mod b/go.mod
index edbd31833..7eec5ff77 100644
--- a/go.mod
+++ b/go.mod
@@ -7,13 +7,17 @@ require (
 	github.com/alecthomas/chroma v0.6.6
 	github.com/fatih/color v1.7.0
 	github.com/google/go-jsonnet v0.13.0
+	github.com/kr/pretty v0.1.0 // indirect
+	github.com/mitchellh/mapstructure v1.1.2
 	github.com/pkg/errors v0.8.1
+	github.com/posener/complete v1.2.1
 	github.com/spf13/cobra v0.0.5
-	github.com/spf13/viper v1.4.0
+	github.com/spf13/pflag v1.0.3
+	github.com/spf13/viper v1.3.2
 	github.com/stretchr/objx v0.2.0
 	github.com/thoas/go-funk v0.4.0
 	golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2
 	golang.org/x/sys v0.0.0-20190616124812-15dcb6c0061f // indirect
-	golang.org/x/text v0.3.2 // indirect
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
 	gopkg.in/yaml.v2 v2.2.2
 )
diff --git a/go.sum b/go.sum
index 009c610e3..8dc6b9d3d 100644
--- a/go.sum
+++ b/go.sum
@@ -1,11 +1,9 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/GeertJohan/go.incremental v1.0.0/go.mod h1:6fAjUhbVuX1KcMD3c8TEgVUqmo4seqhv0i0kdATSkM0=
 github.com/GeertJohan/go.rice v1.0.0/go.mod h1:eH6gbSOAUv07dQuZVnBmoDP8mgsM1rtixis4Tib9if0=
 github.com/Masterminds/semver v1.4.2 h1:WBLTQ37jOCzSLtXNdoo8bNM8876KhNqOKvrlGITgsTc=
 github.com/Masterminds/semver v1.4.2/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
-github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/akavel/rsrc v0.8.0/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
 github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38 h1:smF2tmSOzy2Mm+0dGI2AIUHY+w0BUc+4tn40djz7+6U=
 github.com/alecthomas/assert v0.0.0-20170929043011-405dbfeb8e38/go.mod h1:r7bzyVFMNntcxPZXK3/+KdruV1H5KSlyVY0gc+NgInI=
@@ -18,19 +16,10 @@ github.com/alecthomas/kong v0.2.1-0.20190708041108-0548c6b1afae/go.mod h1:+inYUS
 github.com/alecthomas/kong-hcl v0.1.8-0.20190615233001-b21fea9723c8/go.mod h1:MRgZdU3vrFd05IQ89AxUZ0aYdF39BYoNFa324SodPCA=
 github.com/alecthomas/repr v0.0.0-20180818092828-117648cd9897 h1:p9Sln00KOTlrYkxI1zYWl1QLnEqAqEARBEYa8FQnQcY=
 github.com/alecthomas/repr v0.0.0-20180818092828-117648cd9897/go.mod h1:xTS7Pm1pD1mvyM075QCDSRqH6qRLXylzS24ZTpRiSzQ=
-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/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
-github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
-github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
-github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
-github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
-github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/go-etcd v2.0.0+incompatible/go.mod h1:Jez6KQU2B/sWsbdaef3ED8NzMklzPG4d5KIOhIy30Tk=
 github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
-github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
-github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
 github.com/daaku/go.zipexe v1.0.0/go.mod h1:z8IiR6TsVLEYKwXAoE/I+8ys/sDkgTzSL0CLnGVd57E=
 github.com/danwakefield/fnmatch v0.0.0-20160403171240-cbb64ac3d964 h1:y5HC9v93H5EPKqaS1UYVg1uYah5Xf51mBfIoWehClUQ=
@@ -39,50 +28,27 @@ github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
-github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
 github.com/dlclark/regexp2 v1.1.6 h1:CqB4MjHw0MFCDj+PHHjiESmHX+N7t0tJzKvC6M97BRg=
 github.com/dlclark/regexp2 v1.1.6/go.mod h1:2pZnwuY/m+8K6iRw6wQdMtk+rH5tNGR1i55kozfMjCc=
 github.com/fatih/color v1.7.0 h1:DkWD4oS2D8LGGgTQ6IvwJJXSL5Vp2ffcQg58nFV38Ys=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
-github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
-github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
-github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
-github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
-github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
-github.com/gogo/protobuf v1.2.1 h1:/s5zKNz0uPFCZ5hddgPdo2TK2TVrUNMn0OOX8/aZMTE=
-github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
-github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
-github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
-github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
-github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
 github.com/google/go-jsonnet v0.13.0 h1:Ul0FtJiQl705JIyGKaBZug/W2LBY5p0xwY08Q69eOAg=
 github.com/google/go-jsonnet v0.13.0/go.mod h1:gNwctc8xrpXNs749bjRLO58rjIBVrWz+pgsRoOCh5Vs=
 github.com/gorilla/csrf v1.6.0/go.mod h1:7tSf8kmjNYr7IWDCYhd3U8Ck34iQ/Yw5CJu7bAkHEGI=
 github.com/gorilla/handlers v1.4.1/go.mod h1:Qkdc/uu4tH4g6mTK6auzZ766c4CA0Ng8+o/OAirnOIQ=
 github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
 github.com/gorilla/securecookie v1.1.1/go.mod h1:ra0sb63/xPlUeL+yeDciTfxMRAA+MP+HVt/4epWDjd4=
-github.com/gorilla/websocket v1.4.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ=
-github.com/grpc-ecosystem/go-grpc-middleware v1.0.0/go.mod h1:FiyG127CGDf3tlThmgyCl78X/SZQqEOJBCDaAfeWzPs=
-github.com/grpc-ecosystem/go-grpc-prometheus v1.2.0/go.mod h1:8NvIoxWQoOIhqOTXgfV/d3M/q6VIi02HzZEHgUlZvzk=
-github.com/grpc-ecosystem/grpc-gateway v1.9.0/go.mod h1:vNeuVxBJEsws4ogUvrchl83t/GYV9WGTSLVdBhOQFDY=
+github.com/hashicorp/errwrap v1.0.0 h1:hLrqtEDnRye3+sgx6z4qVLNuviH3MR5aQ0ykNJa/UYA=
+github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
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@@ -97,13 +63,10 @@ github.com/mattn/go-isatty v0.0.4/go.mod h1:M+lRXTBqGeGNdLjl/ufCoiOlB5xdOkqRJdNx
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@@ -112,23 +75,12 @@ github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
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@@ -139,11 +91,9 @@ github.com/spf13/jwalterweatherman v1.0.0 h1:XHEdyB+EcvlqZamSM4ZOMGlc93t6AcsBEu9
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@@ -151,36 +101,13 @@ github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0
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@@ -190,25 +117,9 @@ golang.org/x/sys v0.0.0-20190616124812-15dcb6c0061f h1:25KHgbfyiSm6vwQLbM3zZIe1v
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-gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
-gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/pkg/cmp/complete.go b/pkg/cmp/complete.go
new file mode 100644
index 000000000..fffdfb73f
--- /dev/null
+++ b/pkg/cmp/complete.go
@@ -0,0 +1,74 @@
+package cmp
+
+import (
+	"github.com/posener/complete"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+)
+
+// CompletionHandlers is a set of predictors
+type CompletionHandlers map[string]complete.Predictor
+
+// Add adds a predictor to the list of handlers
+func (h CompletionHandlers) Add(k string, p complete.Predictor) {
+	h[k] = p
+}
+
+// Get returns a predictor from the list of handlers
+func (h CompletionHandlers) Get(k string) complete.Predictor {
+	return h[k]
+}
+
+// GetOrNone returns a predictor in case it exists, otherwise complete.PredictNothing
+func (h CompletionHandlers) GetOrNone(k string) complete.Predictor {
+	if p, ok := h[k]; ok {
+		return p
+	}
+	return complete.PredictNothing
+}
+
+// Has returns whether a predictor exists
+func (h CompletionHandlers) Has(k string) bool {
+	_, ok := h[k]
+	return ok
+}
+
+// Handlers are global Handlers to be used in annotations
+var Handlers = CompletionHandlers{}
+
+// Create parses a *cobra.Command into a complete.Command
+func Create(root *cobra.Command) complete.Command {
+	rootCmp := complete.Command{}
+
+	// Flags
+	rootCmp.Flags = make(complete.Flags)
+	addFlags := func(flag *pflag.Flag) {
+		if flag.Hidden {
+			return
+		}
+
+		handler := Handlers.GetOrNone(root.Annotations["flags/"+flag.Name])
+
+		if len(flag.Shorthand) > 0 {
+			rootCmp.Flags["-"+flag.Shorthand] = handler
+		}
+
+		rootCmp.Flags["--"+flag.Name] = handler
+	}
+	root.LocalFlags().VisitAll(addFlags)
+	root.InheritedFlags().VisitAll(addFlags)
+
+	// Subcommands
+	if root.HasAvailableSubCommands() {
+		rootCmp.Sub = make(complete.Commands)
+		for _, c := range root.Commands() {
+			if !c.Hidden {
+				rootCmp.Sub[c.Name()] = Create(c)
+			}
+		}
+	}
+
+	// Positional Arguments
+	rootCmp.Args = Handlers.GetOrNone(root.Annotations["args"])
+	return rootCmp
+}
diff --git a/pkg/jpath/jpath.go b/pkg/jpath/jpath.go
index 765dbee01..639a76d68 100644
--- a/pkg/jpath/jpath.go
+++ b/pkg/jpath/jpath.go
@@ -7,6 +7,23 @@ import (
 	"path/filepath"
 )
 
+var (
+	// ErrorNoRoot means no rootDir was found in the parents
+	ErrorNoRoot = errors.New("could not locate a jsonnetfile.json in the parent directories, which is required to identify the project root")
+
+	// ErrorNoBase means no baseDir was found in the parents
+	ErrorNoBase = errors.New("could not locate a main.jsonnet in the parent directories, which is required as the entrypoint for the evaluation")
+)
+
+// ErrorFileNotFound means that the searched file was not found
+type ErrorFileNotFound struct {
+	filename string
+}
+
+func (e ErrorFileNotFound) Error() string {
+	return e.filename + " not found"
+}
+
 // Resolve the given directory and resolves the jPath around it. This means it:
 // - figures out the project root (the one with .jsonnetfile, vendor/ and lib/)
 // - figures out the environments base directory (the one with the main.jsonnet)
@@ -15,13 +32,19 @@ import (
 // This results in predictable imports, as it doesn't matter whether the user called
 // called the command further down tree or not. A little bit like git.
 func Resolve(workdir string) (path []string, base, root string, err error) {
-	root, err = findParentFile("jsonnetfile.json", workdir, "/")
+	root, err = FindParentFile("jsonnetfile.json", workdir, "/")
 	if err != nil {
+		if _, ok := err.(ErrorFileNotFound); ok {
+			return nil, "", "", ErrorNoRoot
+		}
 		return nil, "", "", err
 	}
 
-	base, err = findParentFile("main.jsonnet", workdir, root)
+	base, err = FindParentFile("main.jsonnet", workdir, root)
 	if err != nil {
+		if _, ok := err.(ErrorFileNotFound); ok {
+			return nil, "", "", ErrorNoBase
+		}
 		return nil, "", "", err
 	}
 
@@ -32,9 +55,9 @@ func Resolve(workdir string) (path []string, base, root string, err error) {
 	}, base, root, nil
 }
 
-// findParentFile traverses the parent directory tree for the given `file`,
+// FindParentFile traverses the parent directory tree for the given `file`,
 // starting from `start` and ending in `stop`. If the file is not found an error is returned.
-func findParentFile(file, start, stop string) (string, error) {
+func FindParentFile(file, start, stop string) (string, error) {
 	files, err := ioutil.ReadDir(start)
 	if err != nil {
 		return "", err
@@ -43,9 +66,9 @@ func findParentFile(file, start, stop string) (string, error) {
 	if dirContainsFile(files, file) {
 		return start, nil
 	} else if start == stop {
-		return "", errors.New(file + " not found")
+		return "", ErrorFileNotFound{file}
 	}
-	return findParentFile(file, filepath.Dir(start), stop)
+	return FindParentFile(file, filepath.Dir(start), stop)
 }
 
 // dirContainsFile returns whether a file is included in a directory.