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-
- Typing Forth Command Lines
- **************************
-
- This chapter describes the editing facilities that are available when
- you are typing command lines to RISC OS Forthmacs. These facilities
- are much more powerful than those of most other systems. Study this
- carefully, and it will save you a great deal of typing in the future.
-
-
- Quick Reference Chart:
- Moving: Character Word Line
- backward: left-arrow ESC-b ^A
- or ^B
- forward: right-arrow ESC-f ^E
- or ^F
- Erasing: Character Word Line
-
- backward: ^H ESC-h
- or Backspace or ^W
- forward: ^D ESC-d ^K
- or Delete
- entire line: ^U
-
- Others:
- previous command up-arrow or ^P
- next command down-arrow or ^N
-
- complete word ^C
- show matches ^S
-
- retype line ^L
- quote next character ^Q
-
-
- Typing Forth Command Lines
- ==========================
-
-
- Notation
- ========
-
- ^B hold down the Control key and simultaneously type the b key.
- ESC-b first type the Esc key, release it, and then type the b key.
- ^X^C first press ^X, release it, and then press ^C
-
- Note that for Control, two keys are typed at the same time, whereas
- for Esc, the Esc key is first typed and released, then the other key
- is typed.
-
-
- Moving
- ======
-
- left-arrow or ^B Backs up one character without erasing
- right-arrow or ^F Moves forward one character without erasing
- ESC-b Backs up one word without erasing
- ESC-f Moves forward one word without erasing
- ^A Moves to the beginning of the line
- ^E Moves to the end of the line
-
-
- Erasing
- =======
-
- Backspace or ^H Erases character to the left of the cursor
- Delete or ^D Erases character at the cursor
- ESC-h Erases the word to the left of the cursor
- ESC-d Erases the word to the right of the cursor
- ^K Erases from the cursor to the end of the line
-
-
- History
- =======
-
- RISC OS Forthmacs remembers the last 8 lines you typed, so you can
- easily
-
- repeat or modify previously-typed commands.
- up-arrow or ^P Steps backward through the list of
- previous commands.
- down-arrow or ^N Steps forward through the list of
- previous commands.
-
-
- Command Completion
- ==================
-
- When you are typing a Forth word, it is not always necessary to type
- the whole word. If you type the first few characters of the word,
- then type ^C (i.e. hold down the Control key and type the C), Forth
- will try to finish the word for you by looking in its dictionary for
- words which start with the characters you have typed. If there is
- only one possible word, Forth will complete the word for you.
-
- Sometimes Forth will be unable to finish the word. If there are no
- words in the Forth dictionary which start with the characters you have
- already typed, Forth will remove characters from the end until the
- characters that are left start some word in the dictionary. If there
- are several words which start with your characters, Forth will
- complete the word as far as it can. In either case, you can then type
- some more characters to further specify the desired word, then try ^C
- again.
-
- ^C Forth attempts to complete the word you have started
- ^S Shows a list of all the words which start with the
- characters you have typed.
-
-
- Miscellaneous
- =============
-
- ^L Retypes the current line.
- ^Q The next character typed (usually a control
- character) is inserted into the line being typed,
- instead of being treated as an editing command.
-
- ^X^C Quit Forthmacs at once
-
-
- Mnemonics
- =========
-
- To make it easier to remember the control commands, here are some
- mnemonics:
-
- ^F ESC-f Forward character or word
- ^B ESC-b Backward character or word
- ^E End of line
- ^D ESC-d Delete character or word
- ^K Kill rest of line
- ^P Previous line
- ^N Next line
- ^Q Quote next character
-
-
- Tips
- ====
-
- To delete the entire line, type ^A followed by ^K. It is not
- necessary to release the Control key between the typing of the A and
- the typing of the K.
-
- Practice using the history mechanism (^P and ^N). Forth commands are
- frequently repeated, and the history feature can save you much typing.
-
- The "show matches" command (^S) can be used to find all the Forth
- words which start with a particular string of characters. Just type
- that string of characters then type ^S. (There is a Forth command
- SIFTING that will find all the words which contain a particular string
- anywhere in the name, not just at the start as in ^S. SIFTING is
- described in the master glossary.
-
- Try to train your fingers to type ^F, ^B, ^A, ^E, and ^D without using
- your right hand. This can make editing very fast because you don't
- have to move your hands very far, and it is relatively easy to type
- these combinations without looking at your fingers.
-
- Why do many functions have two different key assignments? Some people
- prefer to use the arrow keys because they are easier to remember.
- Others prefer to use the ^ keys because they can be typed without
- moving the hands from the home keys on the keyboard.
-
-
-
-
- For Experts
- ===========
-
- If you do not like the assignment of functions to keys (for instance
- you might prefer to use ^S and ^D to move forward and backward, as in
- Wordstar), you can easily change the assignments. The vocabulary
- KEYS-FORTH contains a colon definition or alias for each key
- assignment. These assignments may be redefined using normal colon
- definitions.
-
- However, note that the existing key assignments are the same as the
- ones in the Emacs editor. The Emacs key assignments cannot be easily
- changed, so if you change the assignments in KEYS-FORTH you will make
- them different from the ones in Emacs.
-
-