Add support for CMP_POINT

Fixes #72

args.go

@@ -57,11 +57,20 @@ func newArgs(line string) Args {
 	}
 }
 
+// splitFields returns a list of fields from the given command line.
+// If the last character is space, it appends an empty field in the end
+// indicating that the field before it was completed.
+// If the last field is of the form "a=b", it splits it to two fields: "a", "b",
+// So it can be completed.
 func splitFields(line string) []string {
 	parts := strings.Fields(line)
+
+	// Add empty field if the last field was completed.
 	if len(line) > 0 && unicode.IsSpace(rune(line[len(line)-1])) {
 		parts = append(parts, "")
 	}
+
+	// Treat the last field if it is of the form "a=b"
 	parts = splitLastEqual(parts)
 	return parts
 }

complete.go

@@ -10,14 +10,16 @@ import (
 	"fmt"
 	"io"
 	"os"
+	"strconv"
 
 	"github.com/posener/complete/cmd"
 	"github.com/posener/complete/match"
 )
 
 const (
-	envComplete = "COMP_LINE"
+	envLine  = "COMP_LINE"
-	envDebug    = "COMP_DEBUG"
+	envPoint = "COMP_POINT"
+	envDebug = "COMP_DEBUG"
 )
 
 // Complete structs define completion for a command with CLI options
@@ -55,14 +57,17 @@ func (c *Complete) Run() bool {
 // For installation: it assumes that flags were added and parsed before
 // it was called.
 func (c *Complete) Complete() bool {
-	line, ok := getLine()
+	line, point, ok := getEnv()
 	if !ok {
 		// make sure flags parsed,
 		// in case they were not added in the main program
 		return c.CLI.Run()
 	}
-	Log("Completing line: %s", line)
+
-	a := newArgs(line)
+	completePhrase := line[:point]
+
+	Log("Completing phrase: %s", completePhrase)
+	a := newArgs(completePhrase)
 	Log("Completing last field: %s", a.Last)
 	options := c.Command.Predict(a)
 	Log("Options: %s", options)
@@ -79,12 +84,19 @@ func (c *Complete) Complete() bool {
 	return true
 }
 
-func getLine() (string, bool) {
+func getEnv() (line string, point int, ok bool) {
-	line := os.Getenv(envComplete)
+	line = os.Getenv(envLine)
 	if line == "" {
-		return "", false
+		return
 	}
-	return line, true
+	point, err := strconv.Atoi(os.Getenv(envPoint))
+	if err != nil {
+		// If failed parsing point for some reason, set it to point
+		// on the end of the line.
+		Log("Failed parsing point %s: %v", os.Getenv(envPoint), err)
+		point = len(line)
+	}
+	return line, point, true
 }
 
 func (c *Complete) output(options []string) {

complete_test.go

@@ -2,14 +2,15 @@ package complete
 
 import (
 	"bytes"
+	"fmt"
 	"os"
 	"sort"
+	"strconv"
 	"strings"
 	"testing"
 )
 
 func TestCompleter_Complete(t *testing.T) {
-	t.Parallel()
 	initTests()
 
 	c := Command{
@@ -39,166 +40,229 @@ func TestCompleter_Complete(t *testing.T) {
 	cmp := New("cmd", c)
 
 	tests := []struct {
-		args string
+		line  string
-		want []string
+		point int // -1 indicates len(line)
+		want  []string
 	}{
 		{
-			args: "",
+			line:  "cmd ",
-			want: []string{"sub1", "sub2"},
+			point: -1,
+			want:  []string{"sub1", "sub2"},
 		},
 		{
-			args: "-",
+			line:  "cmd -",
-			want: []string{"-h", "-global1", "-o"},
+			point: -1,
+			want:  []string{"-h", "-global1", "-o"},
 		},
 		{
-			args: "-h ",
+			line:  "cmd -h ",
-			want: []string{"sub1", "sub2"},
+			point: -1,
+			want:  []string{"sub1", "sub2"},
 		},
 		{
-			args: "-global1 ", // global1 is known follow flag
+			line:  "cmd -global1 ", // global1 is known follow flag
-			want: []string{},
+			point: -1,
+			want:  []string{},
 		},
 		{
-			args: "sub",
+			line:  "cmd sub",
-			want: []string{"sub1", "sub2"},
+			point: -1,
+			want:  []string{"sub1", "sub2"},
 		},
 		{
-			args: "sub1",
+			line:  "cmd sub1",
-			want: []string{"sub1"},
+			point: -1,
+			want:  []string{"sub1"},
 		},
 		{
-			args: "sub2",
+			line:  "cmd sub2",
-			want: []string{"sub2"},
+			point: -1,
+			want:  []string{"sub2"},
 		},
 		{
-			args: "sub1 ",
+			line:  "cmd sub1 ",
-			want: []string{},
+			point: -1,
+			want:  []string{},
 		},
 		{
-			args: "sub1 -",
+			line:  "cmd sub1 -",
-			want: []string{"-flag1", "-flag2", "-h", "-global1"},
+			point: -1,
+			want:  []string{"-flag1", "-flag2", "-h", "-global1"},
 		},
 		{
-			args: "sub2 ",
+			line:  "cmd sub2 ",
-			want: []string{"./", "dir/", "outer/", "readme.md"},
+			point: -1,
+			want:  []string{"./", "dir/", "outer/", "readme.md"},
 		},
 		{
-			args: "sub2 ./",
+			line:  "cmd sub2 ./",
-			want: []string{"./", "./readme.md", "./dir/", "./outer/"},
+			point: -1,
+			want:  []string{"./", "./readme.md", "./dir/", "./outer/"},
 		},
 		{
-			args: "sub2 re",
+			line:  "cmd sub2 re",
-			want: []string{"readme.md"},
+			point: -1,
+			want:  []string{"readme.md"},
 		},
 		{
-			args: "sub2 ./re",
+			line:  "cmd sub2 ./re",
-			want: []string{"./readme.md"},
+			point: -1,
+			want:  []string{"./readme.md"},
 		},
 		{
-			args: "sub2 -flag2 ",
+			line:  "cmd sub2 -flag2 ",
-			want: []string{"./", "dir/", "outer/", "readme.md"},
+			point: -1,
+			want:  []string{"./", "dir/", "outer/", "readme.md"},
 		},
 		{
-			args: "sub1 -fl",
+			line:  "cmd sub1 -fl",
-			want: []string{"-flag1", "-flag2"},
+			point: -1,
+			want:  []string{"-flag1", "-flag2"},
 		},
 		{
-			args: "sub1 -flag1",
+			line:  "cmd sub1 -flag1",
-			want: []string{"-flag1"},
+			point: -1,
+			want:  []string{"-flag1"},
 		},
 		{
-			args: "sub1 -flag1 ",
+			line:  "cmd sub1 -flag1 ",
-			want: []string{}, // flag1 is unknown follow flag
+			point: -1,
+			want:  []string{}, // flag1 is unknown follow flag
 		},
 		{
-			args: "sub1 -flag2 -",
+			line:  "cmd sub1 -flag2 -",
-			want: []string{"-flag1", "-flag2", "-h", "-global1"},
+			point: -1,
+			want:  []string{"-flag1", "-flag2", "-h", "-global1"},
 		},
 		{
-			args: "-no-such-flag",
+			line:  "cmd -no-such-flag",
-			want: []string{},
+			point: -1,
+			want:  []string{},
 		},
 		{
-			args: "-no-such-flag ",
+			line:  "cmd -no-such-flag ",
-			want: []string{"sub1", "sub2"},
+			point: -1,
+			want:  []string{"sub1", "sub2"},
 		},
 		{
-			args: "-no-such-flag -",
+			line:  "cmd -no-such-flag -",
-			want: []string{"-h", "-global1", "-o"},
+			point: -1,
+			want:  []string{"-h", "-global1", "-o"},
 		},
 		{
-			args: "no-such-command",
+			line:  "cmd no-such-command",
-			want: []string{},
+			point: -1,
+			want:  []string{},
 		},
 		{
-			args: "no-such-command ",
+			line:  "cmd no-such-command ",
-			want: []string{"sub1", "sub2"},
+			point: -1,
+			want:  []string{"sub1", "sub2"},
 		},
 		{
-			args: "-o ",
+			line:  "cmd -o ",
-			want: []string{"a.txt", "b.txt", "c.txt", ".dot.txt", "./", "dir/", "outer/"},
+			point: -1,
+			want:  []string{"a.txt", "b.txt", "c.txt", ".dot.txt", "./", "dir/", "outer/"},
 		},
 		{
-			args: "-o ./no-su",
+			line:  "cmd -o ./no-su",
-			want: []string{},
+			point: -1,
+			want:  []string{},
 		},
 		{
-			args: "-o ./",
+			line:  "cmd -o ./",
-			want: []string{"./a.txt", "./b.txt", "./c.txt", "./.dot.txt", "./", "./dir/", "./outer/"},
+			point: -1,
+			want:  []string{"./a.txt", "./b.txt", "./c.txt", "./.dot.txt", "./", "./dir/", "./outer/"},
 		},
 		{
-			args: "-o=./",
+			line:  "cmd -o=./",
-			want: []string{"./a.txt", "./b.txt", "./c.txt", "./.dot.txt", "./", "./dir/", "./outer/"},
+			point: -1,
+			want:  []string{"./a.txt", "./b.txt", "./c.txt", "./.dot.txt", "./", "./dir/", "./outer/"},
 		},
 		{
-			args: "-o .",
+			line:  "cmd -o .",
-			want: []string{"./a.txt", "./b.txt", "./c.txt", "./.dot.txt", "./", "./dir/", "./outer/"},
+			point: -1,
+			want:  []string{"./a.txt", "./b.txt", "./c.txt", "./.dot.txt", "./", "./dir/", "./outer/"},
 		},
 		{
-			args: "-o ./b",
+			line:  "cmd -o ./b",
-			want: []string{"./b.txt"},
+			point: -1,
+			want:  []string{"./b.txt"},
 		},
 		{
-			args: "-o=./b",
+			line:  "cmd -o=./b",
-			want: []string{"./b.txt"},
+			point: -1,
+			want:  []string{"./b.txt"},
 		},
 		{
-			args: "-o ./read",
+			line:  "cmd -o ./read",
-			want: []string{},
+			point: -1,
+			want:  []string{},
 		},
 		{
-			args: "-o=./read",
+			line:  "cmd -o=./read",
-			want: []string{},
+			point: -1,
+			want:  []string{},
 		},
 		{
-			args: "-o ./readme.md",
+			line:  "cmd -o ./readme.md",
-			want: []string{},
+			point: -1,
+			want:  []string{},
 		},
 		{
-			args: "-o ./readme.md ",
+			line:  "cmd -o ./readme.md ",
-			want: []string{"sub1", "sub2"},
+			point: -1,
+			want:  []string{"sub1", "sub2"},
 		},
 		{
-			args: "-o=./readme.md ",
+			line:  "cmd -o=./readme.md ",
-			want: []string{"sub1", "sub2"},
+			point: -1,
+			want:  []string{"sub1", "sub2"},
 		},
 		{
-			args: "-o sub2 -flag3 ",
+			line:  "cmd -o sub2 -flag3 ",
-			want: []string{"opt1", "opt2", "opt12"},
+			point: -1,
+			want:  []string{"opt1", "opt2", "opt12"},
 		},
 		{
-			args: "-o sub2 -flag3 opt1",
+			line:  "cmd -o sub2 -flag3 opt1",
-			want: []string{"opt1", "opt12"},
+			point: -1,
+			want:  []string{"opt1", "opt12"},
 		},
 		{
-			args: "-o sub2 -flag3 opt",
+			line:  "cmd -o sub2 -flag3 opt",
-			want: []string{"opt1", "opt2", "opt12"},
+			point: -1,
+			want:  []string{"opt1", "opt2", "opt12"},
+		},
+		{
+			line: "cmd -o ./b foo",
+			//               ^
+			point: 10,
+			want:  []string{"./b.txt"},
+		},
+		{
+			line: "cmd -o=./b foo",
+			//               ^
+			point: 10,
+			want:  []string{"./b.txt"},
+		},
+		{
+			line: "cmd -o sub2 -flag3 optfoo",
+			//                           ^
+			point: 22,
+			want:  []string{"opt1", "opt2", "opt12"},
+		},
+		{
+			line: "cmd -o ",
+			//         ^
+			point: 4,
+			want:  []string{"sub1", "sub2"},
 		},
 	}
 
 	for _, tt := range tests {
-		t.Run(tt.args, func(t *testing.T) {
+		t.Run(fmt.Sprintf("%s@%d", tt.line, tt.point), func(t *testing.T) {
-			got := runComplete(cmp, tt.args)
+			got := runComplete(cmp, tt.line, tt.point)
 
 			sort.Strings(tt.want)
 			sort.Strings(got)
@@ -211,7 +275,6 @@ func TestCompleter_Complete(t *testing.T) {
 }
 
 func TestCompleter_Complete_SharedPrefix(t *testing.T) {
-	t.Parallel()
 	initTests()
 
 	c := Command{
@@ -243,42 +306,50 @@ func TestCompleter_Complete_SharedPrefix(t *testing.T) {
 	cmp := New("cmd", c)
 
 	tests := []struct {
-		args string
+		line  string
-		want []string
+		point int // -1 indicates len(line)
+		want  []string
 	}{
 		{
-			args: "",
+			line:  "cmd ",
-			want: []string{"status", "job"},
+			point: -1,
+			want:  []string{"status", "job"},
 		},
 		{
-			args: "-",
+			line:  "cmd -",
-			want: []string{"-h", "-global1", "-o"},
+			point: -1,
+			want:  []string{"-h", "-global1", "-o"},
 		},
 		{
-			args: "j",
+			line:  "cmd j",
-			want: []string{"job"},
+			point: -1,
+			want:  []string{"job"},
 		},
 		{
-			args: "job ",
+			line:  "cmd job ",
-			want: []string{"status"},
+			point: -1,
+			want:  []string{"status"},
 		},
 		{
-			args: "job -",
+			line:  "cmd job -",
-			want: []string{"-h", "-global1"},
+			point: -1,
+			want:  []string{"-h", "-global1"},
 		},
 		{
-			args: "job status ",
+			line:  "cmd job status ",
-			want: []string{},
+			point: -1,
+			want:  []string{},
 		},
 		{
-			args: "job status -",
+			line:  "cmd job status -",
-			want: []string{"-f4", "-h", "-global1"},
+			point: -1,
+			want:  []string{"-f4", "-h", "-global1"},
 		},
 	}
 
 	for _, tt := range tests {
-		t.Run(tt.args, func(t *testing.T) {
+		t.Run(tt.line, func(t *testing.T) {
-			got := runComplete(cmp, tt.args)
+			got := runComplete(cmp, tt.line, tt.point)
 
 			sort.Strings(tt.want)
 			sort.Strings(got)
@@ -293,8 +364,12 @@ func TestCompleter_Complete_SharedPrefix(t *testing.T) {
 // runComplete runs the complete login for test purposes
 // it gets the complete struct and command line arguments and returns
 // the complete options
-func runComplete(c *Complete, args string) (completions []string) {
+func runComplete(c *Complete, line string, point int) (completions []string) {
-	os.Setenv(envComplete, "cmd "+args)
+	if point == -1 {
+		point = len(line)
+	}
+	os.Setenv(envLine, line)
+	os.Setenv(envPoint, strconv.Itoa(point))
 	b := bytes.NewBuffer(nil)
 	c.Out = b
 	c.Complete()

gocomplete/go.mod

@@ -1,6 +1,5 @@
 module gocomplete
 
-require (
+require github.com/posener/complete v1.1.2
-	github.com/hashicorp/go-multierror v1.0.0 // indirect
+
-	github.com/posener/complete v1.1.2
+replace github.com/posener/complete v1.1.2 => ./..
-)