cmd/cue,internal/buildattr: add tests for @ignore tags

This CL adds some tests for the up-coming `@ignore` functionality so
that we can see the difference when it is implemented.

Note that the syntax is just the general CUE attribute syntax so
it's valid, just ignored by the loader as yet.

For #2962.

Signed-off-by: Roger Peppe <[email protected]>
Change-Id: I54e4b098bd425d80d4dfa18b1086a0181cc2dee7
Reviewed-on: https://review.gerrithub.io/c/cue-lang/cue/+/1198248
Reviewed-by: Daniel Martí <[email protected]>
TryBot-Result: CUEcueckoo <[email protected]>
Unity-Result: CUE porcuepine <[email protected]>

Author: rogpeppe

cmd/cue/cmd/testdata/script/modtidy_with_build_attrs.txtar

@@ -41,15 +41,32 @@ deps: {
 		v:       "v0.0.1"
 		default: true
 	}
+	"test.example/d7@v0": {
+		v:       "v0.0.1"
+		default: true
+	}
+	"test.example/d8@v0": {
+		v:       "v0.0.1"
+		default: true
+	}
 }
 -- want-stdout-1 --
 prod: false
+ignore: {
+    self: "test.example/d7"
+}
 x: {
     self: "test.example/d2"
 }
 -- want-stdout-2 --
 prod: true
+ignore: {
+    self: "test.example/d7"
+}
 x: {
+    ignore: {
+        self: "test.example/d8"
+    }
     self:        "test.example/d1"
     prodenabled: false
     y: {
@@ -79,6 +96,15 @@ import "test.example/d2"
 
 prod: false
 x: d2
+-- ignorable.cue --
+@ignore()
+
+package foo
+
+import "test.example/d7"
+
+ignore: d7
+
 -- _registry/test.example_d1_v0.0.1/cue.mod/module.cue --
 module: "test.example/d1"
 language: version: "v0.9.2"
@@ -123,6 +149,17 @@ import "test.example/d6"
 
 y: d6
 
+-- _registry/test.example_d1_v0.0.1/ignorable.cue --
+
+@ignore()
+
+package d1
+
+import "test.example/d8"
+
+ignore: d8
+
+
 -- _registry/test.example_d2_v0.0.1/cue.mod/module.cue --
 module: "test.example/d2"
 language: version: "v0.9.2"
@@ -158,3 +195,17 @@ language: version: "v0.9.2"
 -- _registry/test.example_d6_v0.0.1/x.cue --
 package d6
 self: "test.example/d6"
+
+-- _registry/test.example_d7_v0.0.1/cue.mod/module.cue --
+module: "test.example/d7"
+language: version: "v0.9.2"
+-- _registry/test.example_d7_v0.0.1/x.cue --
+package d7
+self: "test.example/d7"
+
+-- _registry/test.example_d8_v0.0.1/cue.mod/module.cue --
+module: "test.example/d8"
+language: version: "v0.9.2"
+-- _registry/test.example_d8_v0.0.1/x.cue --
+package d8
+self: "test.example/d8"

internal/buildattr/buildattr_test.go

@@ -27,6 +27,21 @@ var shouldBuildFileTests = []struct {
 	syntax: `
 @if(foo)
 
+package something
+`,
+	wantOK:       false,
+	wantTagCalls: map[string]bool{"foo": true},
+	wantAttr:     "@if(foo)",
+}, {
+	testName: "PackageWithComments",
+	syntax: `
+
+// Some comment
+
+@if(foo)
+
+// Other comment
+
 package something
 `,
 	wantOK:       false,
@@ -243,6 +258,77 @@ package something
 		"baz": true,
 	},
 	wantAttr: "@if(foo || (!bar && baz))",
+}, {
+	testName: "IgnoreOnly",
+	syntax: `
+@ignore()
+
+package something
+`,
+	wantOK: true,
+}, {
+	testName: "IgnoreWithBuildAttrs",
+	syntax: `
+@ignore()
+@if(blah)
+
+package something
+`,
+	wantOK: false,
+	wantTagCalls: map[string]bool{
+		"blah": true,
+	},
+	wantAttr: "@if(blah)",
+}, {
+	testName: "IgnoreWithMultipleEarlierIfs",
+	syntax: `
+@if(foo)
+@if(bar)
+@ignore()
+
+package something
+`,
+	wantOK: false,
+	wantError: `previous declaration here:
+    testfile.cue:2:1
+multiple @if attributes:
+    testfile.cue:3:1
+`,
+	wantAttr: "@if(foo)",
+}, {
+	testName: "IgnoreWithMultipleLaterIfs",
+	syntax: `
+@ignore()
+@if(foo)
+@if(bar)
+
+package something
+`,
+	wantOK: false,
+	wantError: `previous declaration here:
+    testfile.cue:3:1
+multiple @if attributes:
+    testfile.cue:4:1
+`,
+	wantAttr: "@if(foo)",
+}, {
+	testName: "IgnoreWithoutPackageClause",
+	syntax: `
+@ignore()
+a: 5
+`,
+	wantOK: true,
+}, {
+	testName: "IfAfterDeclaration",
+	syntax: `
+a: 1
+@if(foo)
+`,
+	wantOK: false,
+	wantTagCalls: map[string]bool{
+		"foo": true,
+	},
+	wantAttr: "@if(foo)",
 }}
 
 func TestShouldBuildFile(t *testing.T) {