The handling of keyboard and mouse clicks and gestures is different and varied within the Medley environment. This chart shows common keystrokes. Table of Keystrokes more data.
We’d like to improve keyboard handling but haven’t yet found a path.
At an “exec” (i.e., the REPL).
| character | action |
|---|---|
| backspace | delete the previous character |
| ctrl-H | (same as backspace) |
| enter | if at end of line, terminate |
| ctrl-M | (same as enter) |
| ctrl-alt-J | move down |
| ctrl-alt-L | move to start of line |
| ctrl-alt-Y | “get userexec” ???? |
Interrupt characters
These are enabled per-process. Medley maintains, for each process, a “termtable” which enables different kinds of interrupts.
Usually, the user wants interrupts to occur in the TTY process, which is the one currently receiving keyboard input. However, sometimes the user wants to interrupt the mouse process, if it is currently busy executing a menu command or waiting for the user to specify a region on the screen. Most of the interrupt characters below take place in the mouse process if it is busy, otherwise the TTY process.
| character | action |
|---|---|
| ctrl-B | stop the process and enter a break window |
| ctrl-D | reset the process, unwind the stack to the top level |
| ctrl-E | unwind the stack as if an error occured without break |
| ctrl-P | interrupt printing and reset the PRINTLEVEL |