REPL: Support reading and writing YAML env configs

common/env/env.go

@@ -122,7 +122,7 @@ func (c *Config) AddVariableDecls(vars ...*decls.VariableDecl) *Config {
 	return c.AddVariables(convVars...)
 }
 
-// AddVariables adds one or more vairables to the config.
+// AddVariables adds one or more variables to the config.
 func (c *Config) AddVariables(vars ...*Variable) *Config {
 	c.Variables = append(c.Variables, vars...)
 	return c

repl/BUILD.bazel

@@ -31,6 +31,7 @@ go_library(
         "//cel:go_default_library",
         "//checker:go_default_library",
         "//checker/decls:go_default_library",
+        "//common/env:go_default_library",
         "//common/functions:go_default_library",
         "//common/types:go_default_library",
         "//common/types/ref:go_default_library",
@@ -39,6 +40,7 @@ go_library(
         "@com_github_antlr4_go_antlr_v4//:go_default_library",
         "@dev_cel_expr//conformance/proto2:go_default_library",
         "@dev_cel_expr//conformance/proto3:go_default_library",
+        "@in_yaml_go_yaml_v3//:go_default_library",
         "@org_golang_google_genproto_googleapis_api//expr/v1alpha1:go_default_library",
         "@org_golang_google_genproto_googleapis_rpc//context/attribute_context:go_default_library",
         "@org_golang_google_protobuf//encoding/prototext:go_default_library",
@@ -62,6 +64,7 @@ go_test(
     deps = [
         "//cel:go_default_library",
         "//test/proto2pb:go_default_library",
+        "@com_github_google_go_cmp//cmp:go_default_library",
         "@org_golang_google_genproto_googleapis_api//expr/v1alpha1:go_default_library",
         "@org_golang_google_protobuf//proto:go_default_library",
     ],

repl/commands.go

@@ -61,6 +61,14 @@ from disk or from a predefined package. Supported packages are "cel-spec-test-ty
 
 	helpUsage = `Help prints usage information for the commands supported by the REPL.
 %help`
+
+	statusUsage = `Status prints the current state of the REPL session
+%status
+%status --yaml`
+
+	configUsage = `Config loads a canned REPL state from a config file
+%configure """%let foo : int = 42"""
+%configure --yaml --file 'path/to/env.yaml'`
 )
 
 type letVarCmd struct {
@@ -201,6 +209,8 @@ func Parse(line string) (Cmder, error) {
 			declareUsage,
 			deleteUsage,
 			letUsage,
+			statusUsage,
+			configUsage,
 			optionUsage,
 			loadDescriptorsUsage,
 			helpUsage,

repl/commands_test.go

@@ -176,7 +176,15 @@ func TestParse(t *testing.T) {
             Let introduces a variable or function defined by a sub-CEL expression.
             %let <identifier> (: <type>)? = <expr>
             %let <identifier> (<param_identifier> : <param_type>, ...) : <result-type> -> <expr>
-
+
+            Status prints the current state of the REPL session
+            %status
+            %status --yaml
+
+            Config loads a canned REPL state from a config file
+            %configure """%let foo : int = 42"""
+            %configure --yaml --file 'path/to/env.yaml'
+
             Option enables a CEL environment option which enables configuration and
             optional language features.
             %option --container 'google.protobuf'