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doc: Massage section on "Escape codes" (#912)
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* Add introductory text to the tables

And mention characters that don't have escapes

* Turn tables around

Tables should be structured by what the user wants, not by what the code does.

* Address Julow review #1

- Merge tables, no matter which rule requires escaping; "in the usual way for XML" applies to both
- 3 escapes not mandatory removed from table to new ¶ below
- Found one more symbol → legend

* doc: Clarify escaping of comma and colon per #915
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doc/Possible-key-values.md
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@ -25,31 +25,30 @@ Key values can be any of the following:
+ `⏯:keyevent:85` A play/pause key (which has no effect in most apps). + `⏯:keyevent:85` A play/pause key (which has no effect in most apps).
+ `my@:'my.email@domain.com'` A key that sends an arbitrary string + `my@:'my.email@domain.com'` A key that sends an arbitrary string
- A macro, `symbol:key_def1,key_def2,...`. - A macro, `legend:key_def1,key_def2,...`.
This results in a key that behaves as if the sequence of `key_def` had been pressed in order. This results in a key with legend `legend` that behaves as if the sequence of `key_def` had been pressed in order.
Examples: Examples:
+ `CA:ctrl,a,ctrl,c` A key with legend CA that sends the sequence `ctrl+a`, `ctrl+c`. + `CA:ctrl,a,ctrl,c` A key with legend CA that sends the sequence `ctrl+a`, `ctrl+c`.
+ `Cd:ctrl,backspace` A key with legend Cd that sends the shortcut `ctrl+backspace`. + `Cd:ctrl,backspace` A key with legend Cd that sends the shortcut `ctrl+backspace`.
## Escape codes ### Escape codes
Value | Escape code for
When defining a key value, several characters have special effects. If you want a character not to have its usual effect but to be taken literally, you should "escape" it in the usual way for XML:
To get this character... | ...you can type
:---- | :------ :---- | :------
`\?` | `?` A literal newline character, which is different from `enter` and `action` in certain apps. | `\n`
`\#` | `#` A literal tab character, which is different from `tab` in certain apps. | `\t`
`\@` | `@` `\` | `\\`
`\n` | Literal newline character. This is different from `enter` and `action` in certain apps. `&` | `&`
`\t` | Literal tab character. This is different from `tab` in certain apps. `<` | `&lt;`
`\\` | `\` `>` | `&gt;`
`"` | `&quot;`
XML escape codes also work, including: The characters `?`, `#`, and `@` do not need to be escaped when writing custom layouts. Internally, they can be escaped by prepending backslash (by typing `\?`, `\#`, and `\@`).
Value | Escape code for The characters `,` and `:` can be escaped in a key value, using single quotes. For example, this macro defines a key with legend `http` that sends a string containing `:`: `<key c="http:home,'https://'" />` For simplicity, `,` and `:` cannot be escaped in the key legend.
:------- | :------
`&amp;` | `&`
`&lt;` | `<`
`&gt;` | `>`
`&quot;` | `"`
## Modifiers ## Modifiers
System modifiers are sent to the app, which can take app-specific action. System modifiers are sent to the app, which can take app-specific action.