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terminal: bugfix: tolerate spurious spaces after command prefixes

Browse Source 
Expressions such as:

 frame 0    list
 frame   0   list
 on abreakpoint     print x
 goroutine    1    frame     0     list

should all execute correctly

Fixes #712
This commit is contained in:
aarzilli
2017-04-19 12:17:21 +02:00
committed by Derek Parker
parent 182f805094
commit 86a59c52a6
4 changed files with 22 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
cmd/dlv/cmds/commands.go
View File

@ -333,7 +333,7 @@ func traceCmd(cmd *cobra.Command, args []string) {
cmds := terminal.DebugCommands(client)
t := terminal.New(client, nil)
defer t.Close()
err = cmds.Call("continue", "", t)
err = cmds.Call("continue", t)
if err != nil {
fmt.Fprintln(os.Stderr, err)
return 1

41
pkg/terminal/command.go
View File

@ -260,13 +260,19 @@ func (c *Commands) Find(cmdstr string, prefix cmdPrefix) cmdfunc {
return noCmdAvailable
}
func (c *Commands) CallWithContext(cmdstr, args string, t *Term, ctx callContext) error {
return c.Find(cmdstr, ctx.Prefix)(t, ctx, args)
func (c *Commands) CallWithContext(cmdstr string, t *Term, ctx callContext) error {
vals := strings.SplitN(strings.TrimSpace(cmdstr), " ", 2)
cmdname := vals[0]
var args string
if len(vals) > 1 {
args = strings.TrimSpace(vals[1])
}
return c.Find(cmdname, ctx.Prefix)(t, ctx, args)
}
func (c *Commands) Call(cmdstr, args string, t *Term) error {
func (c *Commands) Call(cmdstr string, t *Term) error {
ctx := callContext{Prefix: noPrefix, Scope: api.EvalScope{GoroutineID: -1, Frame: 0}}
return c.CallWithContext(cmdstr, args, t, ctx)
return c.CallWithContext(cmdstr, t, ctx)
}
// Merge takes aliases defined in the config struct and merges them with the default aliases.
@ -433,7 +439,7 @@ func goroutines(t *Term, ctx callContext, argstr string) error {
}
func (c *Commands) goroutine(t *Term, ctx callContext, argstr string) error {
args := strings.SplitN(argstr, " ", 3)
args := strings.SplitN(argstr, " ", 2)
if ctx.Prefix == onPrefix {
if len(args) != 1 || args[0] != "" {
@ -443,8 +449,7 @@ func (c *Commands) goroutine(t *Term, ctx callContext, argstr string) error {
return nil
}
switch len(args) {
case 1:
if len(args) == 1 {
if ctx.Prefix == scopePrefix {
return errors.New("no command passed to goroutine")
}
@ -467,8 +472,6 @@ func (c *Commands) goroutine(t *Term, ctx callContext, argstr string) error {
fmt.Printf("Switched from %d to %d (thread %d)\n", oldState.SelectedGoroutine.ID, gid, newState.CurrentThread.ID)
return nil
case 2:
args = append(args, "")
}
var err error
@ -477,17 +480,15 @@ func (c *Commands) goroutine(t *Term, ctx callContext, argstr string) error {
if err != nil {
return err
}
return c.CallWithContext(args[1], args[2], t, ctx)
return c.CallWithContext(args[1], t, ctx)
}
func (c *Commands) frame(t *Term, ctx callContext, args string) error {
v := strings.SplitN(args, " ", 3)
v := strings.SplitN(args, " ", 2)
switch len(v) {
case 0, 1:
return errors.New("not enough arguments")
case 2:
v = append(v, "")
}
var err error
@ -496,7 +497,7 @@ func (c *Commands) frame(t *Term, ctx callContext, args string) error {
if err != nil {
return err
}
return c.CallWithContext(v[1], v[2], t, ctx)
return c.CallWithContext(v[1], t, ctx)
}
func printscope(t *Term) error {
@ -1328,16 +1329,12 @@ func getBreakpointByIDOrName(t *Term, arg string) (*api.Breakpoint, error) {
}
func (c *Commands) onCmd(t *Term, ctx callContext, argstr string) error {
args := strings.SplitN(argstr, " ", 3)
args := strings.SplitN(argstr, " ", 2)
if len(args) < 2 {
return errors.New("not enough arguments")
}
if len(args) < 3 {
args = append(args, "")
}
bp, err := getBreakpointByIDOrName(t, args[0])
if err != nil {
return err
@ -1345,7 +1342,7 @@ func (c *Commands) onCmd(t *Term, ctx callContext, argstr string) error {
ctx.Prefix = onPrefix
ctx.Breakpoint = bp
err = c.CallWithContext(args[1], args[2], t, ctx)
err = c.CallWithContext(args[1], t, ctx)
if err != nil {
return err
}
@ -1392,9 +1389,7 @@ func (c *Commands) executeFile(t *Term, name string) error {
continue
}
cmdstr, args := parseCommand(line)
if err := c.Call(cmdstr, args, t); err != nil {
if err := c.Call(line, t); err != nil {
fmt.Printf("%s:%d: %v\n", name, lineno, err)
}
}

4
pkg/terminal/command_test.go
View File

@ -38,8 +38,6 @@ type FakeTerminal struct {
}
func (ft *FakeTerminal) Exec(cmdstr string) (outstr string, err error) {
cmdstr, args := parseCommand(cmdstr)
outfh, err := ioutil.TempFile("", "cmdtestout")
if err != nil {
ft.t.Fatalf("could not create temporary file: %v", err)
@ -57,7 +55,7 @@ func (ft *FakeTerminal) Exec(cmdstr string) (outstr string, err error) {
outstr = string(outbs)
os.Remove(outfh.Name())
}()
err = ft.cmds.Call(cmdstr, args, ft.Term)
err = ft.cmds.Call(cmdstr, ft.Term)
return
}

11
pkg/terminal/terminal.go
View File

@ -128,8 +128,7 @@ func (t *Term) Run() (int, error) {
return 1, fmt.Errorf("Prompt for input failed.\n")
}
cmdstr, args := parseCommand(strings.TrimSpace(cmdstr))
if err := t.cmds.Call(cmdstr, args, t); err != nil {
if err := t.cmds.Call(cmdstr, t); err != nil {
if _, ok := err.(ExitRequestError); ok {
return t.handleExit()
}
@ -241,11 +240,3 @@ func (t *Term) handleExit() (int, error) {
}
return 0, nil
}
func parseCommand(cmdstr string) (string, string) {
vals := strings.SplitN(cmdstr, " ", 2)
if len(vals) == 1 {
return vals[0], ""
}
return vals[0], strings.TrimSpace(vals[1])
}