add 'cmd-capitalize-word' to upcase letter

doc.go

@@ -73,6 +73,7 @@ keybindings:
     cmd-interrupt        (default '<c-c>')
     cmd-word             (default '<a-f>')
     cmd-word-back        (default '<a-b>')
+    cmd-capitalize-word  (default '<a-c>')
 
 The following options can be used to customize the behavior of lf:
 

docstring.go

@@ -77,6 +77,7 @@ keybindings:
     cmd-interrupt        (default '<c-c>')
     cmd-word             (default '<a-f>')
     cmd-word-back        (default '<a-b>')
+    cmd-capitalize-word  (default '<a-c>')
 
 The following options can be used to customize the behavior of lf:
 

eval.go

@@ -6,6 +6,7 @@ import (
 	"os"
 	"strconv"
 	"strings"
+	"unicode"
 	"unicode/utf8"
 )
 
@@ -630,6 +631,17 @@ func (e *callExpr) eval(app *app, args []string) {
 			app.ui.cmdAccRight = append(app.ui.cmdAccLeft[ind:], app.ui.cmdAccRight...)
 			app.ui.cmdAccLeft = app.ui.cmdAccLeft[:ind]
 		}
+	case "cmd-capitalize-word":
+		if len(app.ui.cmdAccRight) > 0 {
+			app.ui.cmdAccRight[0] = unicode.ToUpper(app.ui.cmdAccRight[0])
+			loc := reWordEnd.FindStringIndex(string(app.ui.cmdAccRight))
+			if loc == nil {
+				return
+			}
+			ind := loc[0] + 1
+			app.ui.cmdAccLeft = append(app.ui.cmdAccLeft, app.ui.cmdAccRight[:ind]...)
+			app.ui.cmdAccRight = app.ui.cmdAccRight[ind:]
+		}
 	default:
 		cmd, ok := gOpts.cmds[e.name]
 		if !ok {

opts.go

@@ -144,6 +144,7 @@ func init() {
 	gOpts.cmdkeys["<c-c>"] = &callExpr{"cmd-interrupt", nil, 1}
 	gOpts.cmdkeys["<a-f>"] = &callExpr{"cmd-word", nil, 1}
 	gOpts.cmdkeys["<a-b>"] = &callExpr{"cmd-word-back", nil, 1}
+	gOpts.cmdkeys["<a-c>"] = &callExpr{"cmd-capitalize-word", nil, 1}
 
 	// TODO: implement the rest of readline keys