tiltfile: add shlex.quote

go.mod

@@ -7,6 +7,7 @@ require (
 	github.com/Shopify/sarama v1.18.0 // indirect
 	github.com/Shopify/toxiproxy v2.1.4+incompatible // indirect
 	github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 // indirect
+	github.com/alessio/shellescape v1.2.2
 	github.com/apache/thrift v0.0.0-20171203172758-327ebb6c2b6d // indirect
 	github.com/bitly/go-hostpool v0.1.0 // indirect
 	github.com/bitly/go-simplejson v0.5.0 // indirect

go.sum

@@ -55,6 +55,8 @@ github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412/go.mod h1:WPjqKcmVOxf0
 github.com/akavel/rsrc v0.8.0/go.mod h1:uLoCtb9J+EyAqh+26kdrTgmzRBFPGOolLWKpdxkKq+c=
 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/alessio/shellescape v1.2.2 h1:8LnL+ncxhWT2TR00dfJRT25JWWrhkMZXneHVWnetDZg=
+github.com/alessio/shellescape v1.2.2/go.mod h1:PZAiSCk0LJaZkiCSkPv8qIobYglO3FPpyFjDCtHLS30=
 github.com/apache/thrift v0.0.0-20161221203622-b2a4d4ae21c7/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=
 github.com/apache/thrift v0.0.0-20171203172758-327ebb6c2b6d h1:b/FqDLjWXDQI6XBYvWDVgEKv3xOTs68qRkuqyU37lBc=
 github.com/apache/thrift v0.0.0-20171203172758-327ebb6c2b6d/go.mod h1:cp2SuWMxlEZw2r+iP2GNCdIi4C1qmUzdZFSVb+bacwQ=

internal/tiltfile/shlex/shlex.go

@@ -0,0 +1,30 @@
+package shlex
+
+import (
+	"go.starlark.net/starlark"
+
+	"github.com/tilt-dev/tilt/internal/tiltfile/starkit"
+
+	"github.com/alessio/shellescape"
+)
+
+type Extension struct{}
+
+func NewExtension() Extension {
+	return Extension{}
+}
+
+func (Extension) OnStart(env *starkit.Environment) error {
+	return env.AddBuiltin("shlex.quote", quote)
+}
+
+func quote(thread *starlark.Thread, fn *starlark.Builtin, args starlark.Tuple, kwargs []starlark.Tuple) (starlark.Value, error) {
+	var s string
+	err := starkit.UnpackArgs(thread, fn.Name(), args, kwargs,
+		"name", &s)
+	if err != nil {
+		return nil, err
+	}
+
+	return starlark.String(shellescape.Quote(s)), nil
+}

internal/tiltfile/shlex/shlex_test.go

@@ -0,0 +1,25 @@
+package shlex
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/tilt-dev/tilt/internal/tiltfile/starkit"
+)
+
+func TestQuote(t *testing.T) {
+	f := starkit.NewFixture(t, NewExtension())
+
+	f.File("Tiltfile", `
+s = shlex.quote("foo '$FOO'")
+print(shlex.quote("foo '$FOO'"))
+
+`)
+
+	_, err := f.ExecFile("Tiltfile")
+	require.NoError(t, err)
+
+	require.Equal(t, `'foo '"'"'$FOO'"'"''
+`, f.PrintOutput())
+}

internal/tiltfile/tiltfile_state.go

@@ -29,6 +29,7 @@ import (
 	"github.com/tilt-dev/tilt/internal/tiltfile/k8scontext"
 	"github.com/tilt-dev/tilt/internal/tiltfile/os"
 	"github.com/tilt-dev/tilt/internal/tiltfile/secretsettings"
+	"github.com/tilt-dev/tilt/internal/tiltfile/shlex"
 	"github.com/tilt-dev/tilt/internal/tiltfile/starkit"
 	"github.com/tilt-dev/tilt/internal/tiltfile/starlarkstruct"
 	"github.com/tilt-dev/tilt/internal/tiltfile/telemetry"
@@ -200,6 +201,7 @@ func (s *tiltfileState) loadManifests(absFilename string, userConfigState model.
 		updatesettings.NewExtension(),
 		secretsettings.NewExtension(),
 		encoding.NewExtension(),
+		shlex.NewExtension(),
 		tiltextension.NewExtension(tiltextension.NewGithubFetcher(), tiltextension.NewLocalStore(filepath.Dir(absFilename))),
 	)
 	if err != nil {

vendor/modules.txt

@@ -53,6 +53,9 @@ github.com/Shopify/sarama
 ## explicit
 github.com/agl/ed25519
 github.com/agl/ed25519/edwards25519
+# github.com/alessio/shellescape v1.2.2
+## explicit
+github.com/alessio/shellescape
 # github.com/apache/thrift v0.0.0-20171203172758-327ebb6c2b6d
 ## explicit
 github.com/apache/thrift/lib/go/thrift