Merge pull request #1014 from urfave/lynncyrin-patch-12

Fix 2.1.0 regression

context.go

@@ -28,6 +28,9 @@ func NewContext(app *App, set *flag.FlagSet, parentCtx *Context) *Context {
 	if parentCtx != nil {
 		c.Context = parentCtx.Context
 		c.shellComplete = parentCtx.shellComplete
+		if parentCtx.flagSet == nil {
+			parentCtx.flagSet = &flag.FlagSet{}
+		}
 	}
 
 	c.Command = &Command{}

context_test.go

@@ -344,6 +344,81 @@ func TestContextPropagation(t *testing.T) {
 	}
 }
 
+func TestContextAttributeAccessing(t *testing.T) {
+	tdata := []struct {
+		testCase        string
+		setBoolInput    string
+		ctxBoolInput    string
+		newContextInput *Context
+	}{
+		{
+			testCase:        "empty",
+			setBoolInput:    "",
+			ctxBoolInput:    "",
+			newContextInput: nil,
+		},
+		{
+			testCase:        "empty_with_background_context",
+			setBoolInput:    "",
+			ctxBoolInput:    "",
+			newContextInput: &Context{Context: context.Background()},
+		},
+		{
+			testCase:        "empty_set_bool_and_present_ctx_bool",
+			setBoolInput:    "",
+			ctxBoolInput:    "ctx-bool",
+			newContextInput: nil,
+		},
+		{
+			testCase:        "present_set_bool_and_present_ctx_bool_with_background_context",
+			setBoolInput:    "",
+			ctxBoolInput:    "ctx-bool",
+			newContextInput: &Context{Context: context.Background()},
+		},
+		{
+			testCase:        "present_set_bool_and_present_ctx_bool",
+			setBoolInput:    "ctx-bool",
+			ctxBoolInput:    "ctx-bool",
+			newContextInput: nil,
+		},
+		{
+			testCase:        "present_set_bool_and_present_ctx_bool_with_background_context",
+			setBoolInput:    "ctx-bool",
+			ctxBoolInput:    "ctx-bool",
+			newContextInput: &Context{Context: context.Background()},
+		},
+		{
+			testCase:        "present_set_bool_and_different_ctx_bool",
+			setBoolInput:    "ctx-bool",
+			ctxBoolInput:    "not-ctx-bool",
+			newContextInput: nil,
+		},
+		{
+			testCase:        "present_set_bool_and_different_ctx_bool_with_background_context",
+			setBoolInput:    "ctx-bool",
+			ctxBoolInput:    "not-ctx-bool",
+			newContextInput: &Context{Context: context.Background()},
+		},
+	}
+
+	for _, test := range tdata {
+		t.Run(test.testCase, func(t *testing.T) {
+			// setup
+			set := flag.NewFlagSet("some-flag-set-name", 0)
+			set.Bool(test.setBoolInput, false, "usage documentation")
+			ctx := NewContext(nil, set, test.newContextInput)
+
+			// logic under test
+			value := ctx.Bool(test.ctxBoolInput)
+
+			// assertions
+			if value != false {
+				t.Errorf("expected \"value\" to be false, but it was not")
+			}
+		})
+	}
+}
+
 func TestCheckRequiredFlags(t *testing.T) {
 	tdata := []struct {
 		testCase              string

docs/CHANGELOG.md

@@ -6,6 +6,12 @@
 
 View [unreleased 2.X] series changes.
 
+## [2.1.1] - 2019-12-24
+
+### Fixed
+
+* Fixed a `Context` regression introduced in `v2.1.0` in [urfave/cli/pull/1014](https://github.com/urfave/cli/pull/1014) via [@lynncyrin](https://github.com/lynncyrin)
+
 ## [2.1.0] - 2019-12-24
 
 These release notes were written for the git hash [ae84df4cef4a2a6f1a0cb1d41ea0f3af8755e5a8](https://github.com/urfave/cli/tree/ae84df4cef4a2a6f1a0cb1d41ea0f3af8755e5a8)
@@ -541,7 +547,8 @@ signature of `func(*cli.Context) error`, as defined by `cli.ActionFunc`.
 ### Added
 - Initial implementation.
 
-[unreleased 2.X]: https://github.com/urfave/cli/compare/v2.1.0...HEAD
+[unreleased 2.X]: https://github.com/urfave/cli/compare/v2.1.1...HEAD
+[2.1.1]: https://github.com/urfave/cli/compare/v2.1.0...v2.1.1
 [2.1.0]: https://github.com/urfave/cli/compare/v2.0.0...v2.1.0
 [2.0.0]: https://github.com/urfave/cli/compare/v1.22.2...v2.0.0
 

docs/v2/manual.md

@@ -1402,13 +1402,15 @@ func main() {
       cli.ShowVersion(c)
 
       fmt.Printf("%#v\n", c.App.Command("doo"))
-      if c.Bool("infinite") {
+      // // uncomment when https://github.com/urfave/cli/pull/1014 is released
-        c.App.Run([]string{"app", "doo", "wop"})
+      // if c.Bool("infinite") {
-      }
+      // 	c.App.Run([]string{"app", "doo", "wop"})
-
+      // }
-      if c.Bool("forevar") {
+
-        c.App.RunAsSubcommand(c)
+      // // uncomment when https://github.com/urfave/cli/pull/1014 is released
-      }
+      // if c.Bool("forevar") {
+      // 	c.App.RunAsSubcommand(c)
+      // }
       c.App.Setup()
       fmt.Printf("%#v\n", c.App.VisibleCategories())
       fmt.Printf("%#v\n", c.App.VisibleCommands())
@@ -1424,28 +1426,29 @@ func main() {
       set := flag.NewFlagSet("contrive", 0)
       nc := cli.NewContext(c.App, set, c)
 
-      fmt.Printf("%#v\n", nc.Args())
+      // // uncomment when https://github.com/urfave/cli/pull/1014 is released
-      fmt.Printf("%#v\n", nc.Bool("nope"))
+      // fmt.Printf("%#v\n", nc.Args())
-      fmt.Printf("%#v\n", !nc.Bool("nerp"))
+      // fmt.Printf("%#v\n", nc.Bool("nope"))
-      fmt.Printf("%#v\n", nc.Duration("howlong"))
+      // fmt.Printf("%#v\n", !nc.Bool("nerp"))
-      fmt.Printf("%#v\n", nc.Float64("hay"))
+      // fmt.Printf("%#v\n", nc.Duration("howlong"))
-      fmt.Printf("%#v\n", nc.Generic("bloop"))
+      // fmt.Printf("%#v\n", nc.Float64("hay"))
-      fmt.Printf("%#v\n", nc.Int64("bonk"))
+      // fmt.Printf("%#v\n", nc.Generic("bloop"))
-      fmt.Printf("%#v\n", nc.Int64Slice("burnks"))
+      // fmt.Printf("%#v\n", nc.Int64("bonk"))
-      fmt.Printf("%#v\n", nc.Int("bips"))
+      // fmt.Printf("%#v\n", nc.Int64Slice("burnks"))
-      fmt.Printf("%#v\n", nc.IntSlice("blups"))
+      // fmt.Printf("%#v\n", nc.Int("bips"))
-      fmt.Printf("%#v\n", nc.String("snurt"))
+      // fmt.Printf("%#v\n", nc.IntSlice("blups"))
-      fmt.Printf("%#v\n", nc.StringSlice("snurkles"))
+      // fmt.Printf("%#v\n", nc.String("snurt"))
-      fmt.Printf("%#v\n", nc.Uint("flub"))
+      // fmt.Printf("%#v\n", nc.StringSlice("snurkles"))
-      fmt.Printf("%#v\n", nc.Uint64("florb"))
+      // fmt.Printf("%#v\n", nc.Uint("flub"))
-
+      // fmt.Printf("%#v\n", nc.Uint64("florb"))
-      fmt.Printf("%#v\n", nc.FlagNames())
+
-      fmt.Printf("%#v\n", nc.IsSet("wat"))
+      // // uncomment when https://github.com/urfave/cli/pull/1014 is released
-      fmt.Printf("%#v\n", nc.Set("wat", "nope"))
+      // fmt.Printf("%#v\n", nc.FlagNames())
-      fmt.Printf("%#v\n", nc.NArg())
+      // fmt.Printf("%#v\n", nc.IsSet("wat"))
-      fmt.Printf("%#v\n", nc.NumFlags())
+      // fmt.Printf("%#v\n", nc.Set("wat", "nope"))
-      fmt.Printf("%#v\n", nc.Lineage()[1])
+      // fmt.Printf("%#v\n", nc.NArg())
-
+      // fmt.Printf("%#v\n", nc.NumFlags())
+      // fmt.Printf("%#v\n", nc.Lineage()[1])
       nc.Set("wat", "also-nope")
 
       ec := cli.Exit("ohwell", 86)