build: make rclone build with wasm

Needed to drop
- azureblob backend
- cache backend
- qingstor backend
- cachestats command
- ncdu command

lib/terminal/terminal.go

@@ -9,7 +9,6 @@ import (
 	"sync"
 
 	colorable "github.com/mattn/go-colorable"
-	"golang.org/x/crypto/ssh/terminal"
 )
 
 // VT100 codes
@@ -72,7 +71,7 @@ var (
 func Start() {
 	once.Do(func() {
 		f := os.Stdout
-		if !terminal.IsTerminal(int(f.Fd())) {
+		if !IsTerminal(int(f.Fd())) {
 			// If stdout not a tty then remove escape codes
 			Out = colorable.NewNonColorable(f)
 		} else if runtime.GOOS == "windows" && os.Getenv("TERM") != "" {
@@ -89,16 +88,6 @@ func WriteString(s string) {
 	Write([]byte(s))
 }
 
-// GetSize reads the dimensions of the current terminal or returns a
-// sensible default
-func GetSize() (w, h int) {
-	w, h, err := terminal.GetSize(int(os.Stdout.Fd()))
-	if err != nil {
-		w, h = 80, 25
-	}
-	return w, h
-}
-
 // Out is an io.Writer which can be used to write to the terminal
 // eg for use with fmt.Fprintf(terminal.Out, "terminal fun: %d\n", n)
 var Out io.Writer

lib/terminal/terminal_normal.go

@@ -0,0 +1,31 @@
+//+build !js
+
+package terminal
+
+import (
+	"os"
+
+	"golang.org/x/crypto/ssh/terminal"
+)
+
+// GetSize reads the dimensions of the current terminal or returns a
+// sensible default
+func GetSize() (w, h int) {
+	w, h, err := terminal.GetSize(int(os.Stdout.Fd()))
+	if err != nil {
+		w, h = 80, 25
+	}
+	return w, h
+}
+
+// IsTerminal returns whether the fd passed in is a terminal or not
+func IsTerminal(fd int) bool {
+	return terminal.IsTerminal(fd)
+}
+
+// ReadPassword reads a line of input from a terminal without local echo. This
+// is commonly used for inputting passwords and other sensitive data. The slice
+// returned does not include the \n.
+func ReadPassword(fd int) ([]byte, error) {
+	return terminal.ReadPassword(fd)
+}

lib/terminal/terminal_unsupported.go

@@ -0,0 +1,23 @@
+//+build js
+
+package terminal
+
+import "errors"
+
+// GetSize reads the dimensions of the current terminal or returns a
+// sensible default
+func GetSize() (w, h int) {
+	return 80, 25
+}
+
+// IsTerminal returns whether the fd passed in is a terminal or not
+func IsTerminal(fd int) bool {
+	return false
+}
+
+// ReadPassword reads a line of input from a terminal without local echo. This
+// is commonly used for inputting passwords and other sensitive data. The slice
+// returned does not include the \n.
+func ReadPassword(fd int) ([]byte, error) {
+	return nil, errors.New("can't read password")
+}