有没有办法在Scala的REPL中使用ctrl作为前向删除？

Question

因此，在Scala中，我可以使用ctrl-{p，n，a，e}来执行行的前面-、下一个、开头和结尾。但是，如果我不能使用ctrl转发-删除，我很快就会发疯。

是否有可能以某种方式实现这一点？

我用的是Mac。

更新

将下列行添加到接受的答案中，以获得ctrl-{a，e}。在jline2 repo jline2回购在GitHub中可以找到更大的键绑定文件堪萨斯州。

# CTRL-A: move to the beginning of the line
1=MOVE_TO_BEG

# CTRL-E: move the cursor to the end of the line
5=MOVE_TO_END

Update2

我刚刚安装了Scala2.9.0.final，我可以确认ctrl现在正在正常工作。除非它在终止shell时是空行，否则它是向前删除。

Answer 1

下面是一个非常小的密钥绑定属性文件，包括您想要的^D

# CTRL-B: move to the previous character
2: PREV_CHAR

# CTRL-D: delete the previous character
4: DELETE_NEXT_CHAR

# CTRL-F: move to the next character
6: NEXT_CHAR

# BACKSPACE, CTRL-H: delete the previous character
# 8 is the ASCII code for backspace and therefor
# deleting the previous character
8: DELETE_PREV_CHAR

# TAB, CTRL-I: signal that console completion should be attempted
9: COMPLETE

# CTRL-J, CTRL-M: newline
10: NEWLINE

# ENTER: newline
13: NEWLINE

# CTRL-N: scroll to the next element in the history buffer
14: NEXT_HISTORY

# CTRL-P: scroll to the previous element in the history buffer
16: PREV_HISTORY

# CTRL-V: paste the contents of the clipboard (useful for Windows terminal)
22: PASTE

# DELETE, CTRL-?: delete the previous character
# 127 is the ASCII code for delete
127: DELETE_PREV_CHAR

将其放入文件中，然后按如下方式调用scala：

scala -Djline.keybindings=/path/to/keybindings.properties

或者通过JAVA_OPTS传递。您必须在Internet上查找存在哪些键绑定，并尝试使用Scala的:keybindings来查看缺省值(不过，它不会反映实际的键绑定)。

Answer 2

在Scala2.9的REPL中，有一个新的键绑定命令。这表明：

scala> :keybindings
Reading jline properties for default key bindings.
Accuracy not guaranteed: treat this as a guideline only.

  1 CTRL-A: move to the beginning of the line
  2 CTRL-B: move to the previous character
  4 CTRL-D: close out the input stream
  5 CTRL-E: move the cursor to the end of the line
  6 CTRL-F: move to the next character
  7 CTRL-G: abort
  8 BACKSPACE, CTRL-H: delete the previous character 8 is the ASCII code for backspace and therefor deleting the previous character
  9 TAB, CTRL-I: signal that console completion should be attempted
 10 CTRL-J, CTRL-M: newline
 11 CTRL-K: erase the current line
 12 CTRL-L: clear screen
 13 ENTER: newline
 14 CTRL-N: scroll to the next element in the history buffer
 15 CTRL-O: move to the previous word
 16 CTRL-P: scroll to the previous element in the history buffer
 18 CTRL-R: redraw the current line
 21 CTRL-U: delete all the characters before the cursor position
 22 CTRL-V: paste the contents of the clipboard (useful for Windows terminal)
 23 CTRL-W: delete the word directly before the cursor
127 DELETE, CTRL-?: delete the next character 127 is the ASCII code for delete

在macbook笔记本电脑上，DELETE可以通过Fn + BACKSPACE访问。