Add logic to complete when last flag uses the equal sign

If the last flag is of the form -flag=value, complete the value according to -flag.

args.go

@@ -3,6 +3,8 @@ package complete
 import (
 	"os"
 	"path/filepath"
+	"strings"
+	"unicode"
 )
 
 // Args describes command line arguments
@@ -37,16 +39,41 @@ func (a Args) Directory() string {
 	return fixPathForm(a.Last, dir)
 }
 
-func newArgs(line []string) Args {
+func newArgs(line string) Args {
-	completed := removeLast(line[1:])
+	var (
+		all       []string
+		completed []string
+	)
+	parts := splitFields(line)
+	if len(parts) > 0 {
+		all = parts[1:]
+		completed = removeLast(parts[1:])
+	}
 	return Args{
-		All:           line[1:],
+		All:           all,
 		Completed:     completed,
-		Last:          last(line),
+		Last:          last(parts),
 		LastCompleted: last(completed),
 	}
 }
 
+func splitFields(line string) []string {
+	parts := strings.Fields(line)
+	if len(line) > 0 && unicode.IsSpace(rune(line[len(line)-1])) {
+		parts = append(parts, "")
+	}
+	parts = splitLastEqual(parts)
+	return parts
+}
+
+func splitLastEqual(line []string) []string {
+	if len(line) == 0 {
+		return line
+	}
+	parts := strings.Split(line[len(line)-1], "=")
+	return append(line[:len(line)-1], parts...)
+}
+
 func (a Args) from(i int) Args {
 	if i > len(a.All) {
 		i = len(a.All)
@@ -67,9 +94,9 @@ func removeLast(a []string) []string {
 	return a
 }
 
-func last(args []string) (last string) {
+func last(args []string) string {
-	if len(args) > 0 {
+	if len(args) == 0 {
-		last = args[len(args)-1]
+		return ""
 	}
-	return
+	return args[len(args)-1]
 }

args_test.go

@@ -49,7 +49,7 @@ func TestArgs(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.line, func(t *testing.T) {
 
-			a := newArgs(strings.Split(tt.line, " "))
+			a := newArgs(tt.line)
 
 			if got, want := strings.Join(a.Completed, " "), tt.completed; got != want {
 				t.Errorf("%s failed: Completed = %q, want %q", t.Name(), got, want)
@@ -131,7 +131,7 @@ func TestArgs_From(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(fmt.Sprintf("%s/%d", tt.line, tt.from), func(t *testing.T) {
 
-			a := newArgs(strings.Split(tt.line, " "))
+			a := newArgs(tt.line)
 			n := a.from(tt.from)
 
 			if got, want := strings.Join(n.All, " "), tt.newLine; got != want {
@@ -205,7 +205,7 @@ func TestArgs_Directory(t *testing.T) {
 	for _, tt := range tests {
 		t.Run(tt.line, func(t *testing.T) {
 
-			a := newArgs(strings.Split(tt.line, " "))
+			a := newArgs(tt.line)
 
 			if got, want := a.Directory(), tt.directory; got != want {
 				t.Errorf("%s failed: directory = %q, want %q", t.Name(), got, want)

complete.go

@@ -9,7 +9,6 @@ import (
 	"flag"
 	"fmt"
 	"os"
-	"strings"
 
 	"github.com/posener/complete/cmd"
 )
@@ -61,7 +60,7 @@ func (c *Complete) Complete() bool {
 	Log("Completing line: %s", line)
 
 	a := newArgs(line)
-
+	Log("Completing last field: %s", a.Last)
 	options := c.Command.Predict(a)
 
 	Log("Completion: %s", options)
@@ -69,12 +68,12 @@ func (c *Complete) Complete() bool {
 	return true
 }
 
-func getLine() ([]string, bool) {
+func getLine() (string, bool) {
 	line := os.Getenv(envComplete)
 	if line == "" {
-		return nil, false
+		return "", false
 	}
-	return strings.Split(line, " "), true
+	return line, true
 }
 
 func output(options []string) {

complete_test.go

@@ -143,14 +143,30 @@ func TestCompleter_Complete(t *testing.T) {
 			args: "-o ./",
 			want: []string{"./a.txt", "./b.txt", "./c.txt", "./.dot.txt", "./", "./dir/", "./outer/"},
 		},
+		{
+			args: "-o=./",
+			want: []string{"./a.txt", "./b.txt", "./c.txt", "./.dot.txt", "./", "./dir/", "./outer/"},
+		},
 		{
 			args: "-o .",
 			want: []string{"./a.txt", "./b.txt", "./c.txt", "./.dot.txt", "./", "./dir/", "./outer/"},
 		},
+		{
+			args: "-o ./b",
+			want: []string{"./b.txt"},
+		},
+		{
+			args: "-o=./b",
+			want: []string{"./b.txt"},
+		},
 		{
 			args: "-o ./read",
 			want: []string{},
 		},
+		{
+			args: "-o=./read",
+			want: []string{},
+		},
 		{
 			args: "-o ./readme.md",
 			want: []string{},
@@ -159,6 +175,10 @@ func TestCompleter_Complete(t *testing.T) {
 			args: "-o ./readme.md ",
 			want: []string{"sub1", "sub2"},
 		},
+		{
+			args: "-o=./readme.md ",
+			want: []string{"sub1", "sub2"},
+		},
 		{
 			args: "-o sub2 -flag3 ",
 			want: []string{"opt1", "opt2", "opt12"},

gocomplete/complete.go

@@ -28,7 +28,7 @@ func main() {
 			"-asmflags":      complete.PredictAnything,
 			"-buildmode":     complete.PredictAnything,
 			"-compiler":      complete.PredictAnything,
-			"-gccgoflags":    complete.PredictAnything,
+			"-gccgoflags":    complete.PredictSet("gccgo", "gc"),
 			"-gcflags":       complete.PredictAnything,
 			"-installsuffix": complete.PredictAnything,
 			"-ldflags":       complete.PredictAnything,

predict_test.go

@@ -158,7 +158,7 @@ func TestPredicate(t *testing.T) {
 		for _, arg := range tt.argList {
 			t.Run(tt.name+"/arg="+arg, func(t *testing.T) {
 
-				matches := tt.p.Predict(newArgs(strings.Split(arg, " ")))
+				matches := tt.p.Predict(newArgs(arg))
 
 				sort.Strings(matches)
 				sort.Strings(tt.want)