Merge pull request shyiko#3 from posener/predicate-as-function-type

Predicate as function type

.travis.yml

@@ -8,7 +8,7 @@ before_install:
   - go get -u -t ./...
 
 script:
-  - ./go.test.sh
+  - go test -v -race -coverprofile=coverage.txt -covermode=atomic
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)

command.go

@@ -2,13 +2,13 @@ package complete
 
 type Commands map[string]Command
 
-type Flags map[string]*Predicate
+type Flags map[string]Predicate
 
 type Command struct {
 	Name  string
 	Sub   Commands
 	Flags Flags
-	Args  *Predicate
+	Args  Predicate
 }
 
 // options returns all available complete options for the given command
@@ -17,11 +17,11 @@ func (c *Command) options(args []string) (options []Option, only bool) {
 
 	// remove the first argument, which is the command name
 	args = args[1:]
-
+	last := last(args)
 	// if prev has something that needs to follow it,
 	// it is the most relevant completion
-	if predicate, ok := c.Flags[last(args)]; ok && predicate != nil {
-		return predicate.predict(), true
+	if predicate, ok := c.Flags[last]; ok && predicate != nil {
+		return predicate.predict(last), true
 	}
 
 	sub, options, only := c.searchSub(args)
@@ -41,7 +41,7 @@ func (c *Command) options(args []string) (options []Option, only bool) {
 	}
 
 	// add additional expected argument of the command
-	options = append(options, c.Args.predict()...)
+	options = append(options, c.Args.predict(last)...)
 
 	return
 }

gocomplete/complete.go

@@ -8,8 +8,8 @@ var (
 	predictEllipsis = complete.PredictSet("./...")
 
 	goFilesOrPackages = complete.PredictFiles("**.go").
-		Or(complete.PredictDirs("./")).
-		Or(predictEllipsis)
+				Or(complete.PredictDirs).
+				Or(predictEllipsis)
 )
 
 func main() {
@@ -34,7 +34,7 @@ func main() {
 			"-installsuffix": complete.PredictAnything,
 			"-ldflags":       complete.PredictAnything,
 			"-linkshared":    complete.PredictNothing,
-			"-pkgdir":        complete.PredictDirs("./"),
+			"-pkgdir":        complete.PredictDirs,
 			"-tags":          complete.PredictAnything,
 			"-toolexec":      complete.PredictAnything,
 		},
@@ -45,7 +45,7 @@ func main() {
 		Flags: complete.Flags{
 			"-exec": complete.PredictAnything,
 		},
-		Args: complete.PredictFiles("**.go"),
+		Args: complete.PredictFiles("*.go"),
 	}
 
 	test := complete.Command{
@@ -59,23 +59,23 @@ func main() {
 			"-count":     complete.PredictAnything,
 			"-cover":     complete.PredictNothing,
 			"-covermode": complete.PredictSet("set", "count", "atomic"),
-			"-coverpkg":  complete.PredictDirs("./"),
+			"-coverpkg":  complete.PredictDirs,
 			"-cpu":       complete.PredictAnything,
 			"-run":       predictTest("test"),
 			"-short":     complete.PredictNothing,
 			"-timeout":   complete.PredictAnything,
 
 			"-benchmem":             complete.PredictNothing,
-			"-blockprofile":         complete.PredictFiles("**.out"),
+			"-blockprofile":         complete.PredictFiles("*.out"),
 			"-blockprofilerate":     complete.PredictAnything,
-			"-coverprofile":         complete.PredictFiles("**.out"),
-			"-cpuprofile":           complete.PredictFiles("**.out"),
-			"-memprofile":           complete.PredictFiles("**.out"),
+			"-coverprofile":         complete.PredictFiles("*.out"),
+			"-cpuprofile":           complete.PredictFiles("*.out"),
+			"-memprofile":           complete.PredictFiles("*.out"),
 			"-memprofilerate":       complete.PredictAnything,
-			"-mutexprofile":         complete.PredictFiles("**.out"),
+			"-mutexprofile":         complete.PredictFiles("*.out"),
 			"-mutexprofilefraction": complete.PredictAnything,
-			"-outputdir":            complete.PredictDirs("./"),
-			"-trace":                complete.PredictFiles("**.out"),
+			"-outputdir":            complete.PredictDirs,
+			"-trace":                complete.PredictFiles("*.out"),
 		},
 		Args: goFilesOrPackages,
 	}
@@ -115,7 +115,7 @@ func main() {
 			"-n": complete.PredictNothing,
 			"-x": complete.PredictNothing,
 		},
-		Args: complete.PredictDirs("./"),
+		Args: complete.PredictDirs,
 	}
 
 	list := complete.Command{
@@ -124,7 +124,7 @@ func main() {
 			"-f":    complete.PredictAnything,
 			"-json": complete.PredictNothing,
 		},
-		Args: complete.PredictDirs("./"),
+		Args: complete.PredictDirs,
 	}
 
 	tool := complete.Command{
@@ -141,7 +141,7 @@ func main() {
 			"-n": complete.PredictNothing,
 			"-x": complete.PredictNothing,
 		},
-		Args: complete.PredictDirs("./"),
+		Args: complete.PredictDirs,
 	}
 
 	env := complete.Command{
@@ -152,7 +152,7 @@ func main() {
 	version := complete.Command{}
 
 	fix := complete.Command{
-		Args: complete.PredictDirs("./"),
+		Args: complete.PredictDirs,
 	}
 
 	// commands that also accepts the build flags

gocomplete/tests.go

@@ -11,16 +11,14 @@ import (
 	"github.com/posener/complete"
 )
 
-func predictTest(testType string) *complete.Predicate {
-	return &complete.Predicate{
-		Predictor: func() []complete.Option {
-			tests := testNames(testType)
-			options := make([]complete.Option, len(tests))
-			for i := range tests {
-				options[i] = complete.Arg(tests[i])
-			}
-			return options
-		},
+func predictTest(testType string) complete.Predicate {
+	return func(last string) []complete.Option {
+		tests := testNames(testType)
+		options := make([]complete.Option, len(tests))
+		for i := range tests {
+			options[i] = complete.Arg(tests[i])
+		}
+		return options
 	}
 }
 

install/home.go

@@ -5,10 +5,10 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"os"
 	"os/user"
 	"path/filepath"
-	"io/ioutil"
 )
 
 type home struct{}
@@ -150,4 +150,4 @@ func copyFile(src string, dst string) error {
 	defer out.Close()
 	_, err = io.Copy(out, in)
 	return err
-}
+}

install/root.go

@@ -25,6 +25,5 @@ func (root) Uninstall(cmd string, bin string) error {
 }
 
 func getBashCompletionDLink(cmd string) string {
-	return "/etc/bash_completion.d/"+cmd
+	return "/etc/bash_completion.d/" + cmd
 }
-

predicate.go

@@ -6,74 +6,63 @@ import (
 )
 
 // Predicate determines what terms can follow a command or a flag
-type Predicate struct {
-	// Predictor is function that returns list of arguments that can
-	// come after the flag/command
-	Predictor func() []Option
-}
+type Predicate func(last string) []Option
 
 // Or unions two predicate struct, so that the result predicate
 // returns the union of their predication
-func (p *Predicate) Or(other *Predicate) *Predicate {
+func (p Predicate) Or(other Predicate) Predicate {
 	if p == nil || other == nil {
 		return nil
 	}
-	return &Predicate{
-		Predictor: func() []Option { return append(p.predict(), other.predict()...) },
-	}
+	return func(last string) []Option { return append(p.predict(last), other.predict(last)...) }
 }
 
-func (p *Predicate) predict() []Option {
-	if p == nil || p.Predictor == nil {
+func (p Predicate) predict(last string) []Option {
+	if p == nil {
 		return nil
 	}
-	return p.Predictor()
+	return p(last)
 }
 
 var (
-	PredictNothing  *Predicate = nil
-	PredictAnything            = &Predicate{}
+	PredictNothing Predicate = nil
 )
 
-func PredictSet(options ...string) *Predicate {
-	return &Predicate{
-		Predictor: func() []Option {
-			ret := make([]Option, len(options))
-			for i := range options {
-				ret[i] = Arg(options[i])
-			}
-			return ret
-		},
-	}
-}
+func PredictAnything(last string) []Option { return nil }
 
-func PredictFiles(pattern string) *Predicate {
-	return &Predicate{Predictor: glob(pattern)}
+func PredictSet(options ...string) Predicate {
+	return func(last string) []Option {
+		ret := make([]Option, len(options))
+		for i := range options {
+			ret[i] = Arg(options[i])
+		}
+		return ret
+	}
 }
 
-func PredictDirs(path string) *Predicate {
-	return &Predicate{Predictor: dirs(path)}
+func PredictDirs(last string) (options []Option) {
+	dir := dirFromLast(last)
+	return dirsAt(dir)
 }
 
-func dirs(path string) func() []Option {
-	return func() (options []Option) {
-		dirs := []string{}
-		filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
-			if info.IsDir() {
-				dirs = append(dirs, path)
-			}
-			return nil
-		})
-		if !filepath.IsAbs(path) {
-			filesToRel(dirs)
+func dirsAt(path string) []Option {
+	dirs := []string{}
+	filepath.Walk(path, func(path string, info os.FileInfo, err error) error {
+		if info.IsDir() {
+			dirs = append(dirs, path)
 		}
-		return filesToOptions(dirs)
+		return nil
+	})
+	if !filepath.IsAbs(path) {
+		filesToRel(dirs)
 	}
+	return filesToOptions(dirs)
 }
 
-func glob(pattern string) func() []Option {
-	return func() []Option {
-		files, err := filepath.Glob(pattern)
+func PredictFiles(pattern string) Predicate {
+	return func(last string) []Option {
+		dir := dirFromLast(last)
+		files, err := filepath.Glob(filepath.Join(dir, pattern))
 		if err != nil {
 			Log("failed glob operation with pattern '%s': %s", pattern, err)
 		}
@@ -83,6 +72,7 @@ func glob(pattern string) func() []Option {
 		return filesToOptions(files)
 	}
 }
+
 func filesToRel(files []string) {
 	wd, err := os.Getwd()
 	if err != nil {
@@ -97,6 +87,9 @@ func filesToRel(files []string) {
 		if err != nil {
 			continue
 		}
+		if rel == "." {
+			rel = ""
+		}
 		files[i] = "./" + rel
 	}
 	return
@@ -109,3 +102,15 @@ func filesToOptions(files []string) []Option {
 	}
 	return options
 }
+
+// dirFromLast gives the directory of the current written
+// last argument if it represents a file name being written.
+// in case that it is not, we fall back to the current directory.
+func dirFromLast(last string) string {
+	dir := filepath.Dir(last)
+	_, err := os.Stat(dir)
+	if err != nil {
+		return "./"
+	}
+	return dir
+}