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doc/Factoids.md: document new expansion modifiers

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doc/Factoids.md
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@ -340,8 +340,10 @@ You can use the following variables in a factoid or, in some cases, as an argume
`$0` expands to the original keyword used to invoke a factoid.
## List variables
You may create a factoid containing a list of quoted values. When this factoid is used as a `$variable` a random value
will be selected from the list.
You may create a factoid containing a list of values. Each value can optionally be quoted to preserve spaces within.
When this factoid is used as a `$variable` a random value will be selected from the list. You can further control
which or how many values are chosen via [expansion modifiers](#expansion-modifiers).
For example, first create a normal factoid.
@ -379,7 +381,26 @@ Another example, creating the RTFM trigger:
* PBot thwacks mauke with a big red manual.
### Expansion modifiers
Factoid `$variables` can accept trailing expansion modifier keywords prefixed with a colon. These can be chained together to combine their effects.
List `$variables` can accept trailing expansion modifier keywords prefixed with a colon. These can be chained together to combine their effects.
There are two categories of expansion modifiers. Selection modifiers and text modifiers.
Selection modifiers control how values are chosen from the `$variable`'s list.
<pragma-> !echo $colors:pick(3)
<PBot> red pink green
Note that modifiers may not contain spaces. `:pick(2, 3)` is invalid and must be written as `:pick(2,3)`.
Modifier | Description
--- | ---
`:<channel>` | Looks for variable in `<channel>` first; use `global` to refer to the global channel. This modifier must be the first modifier when chained with other modifiers.
`:index(n)` | Selects the `n`th element from the `$variable` list.
`:pick(x)` | Selects `x` count of random elements.
`:pick(x,y)` | Selects between `x` and `y`, inclusive, count of random elements.
`:pick_unique(x,y)` | Selects between `x` and `y`, inclusive, count of random elements without any repeated selections.
Text modifiers alter the selected values.
<pragma-> !echo $colors:uc
<PBot> RED
@ -389,11 +410,25 @@ Factoid `$variables` can accept trailing expansion modifier keywords prefixed wi
Modifier | Description
--- | ---
`:uc` | Uppercases the expansion
`:lc` | Lowercases the expansion
`:ucfirst` | Uppercases the first letter in the expansion
`:title` | Lowercases the expansion and then uppercases the initial letter of each word
`:<channel>` | Looks for variable in `<channel>` first; use `global` to refer to the global channel
`:uc` | Uppercases the expansion.
`:lc` | Lowercases the expansion.
`:ucfirst` | Uppercases the first letter in the expansion.
`:title` | Lowercases the expansion and then uppercases the initial letter of each word.
The following text modifiers apply only to selection modifiers that return more than one selection. Using them otherwise has no effect.
Modifier | Description
--- | ---
`:sort` | Sorts the selected list in ascending order.
`:-sort` | Sorts the selected list in descending order.
`:comma` | Converts a selected list to a comma-separated list.
`:enumerate` | Converts a selected list to a comma-separated list with `and` replacing the final comma.
<pragma-> !echo $colors:pick(5):comma
<PBot> red, yellow, blue, dark purple, orange
<pragma-> !echo $colors:pick(5):enumerate
<PBot> blue, green, pink, orange and yellow
## action_with_args
You can use the [`factset`](#factset) command to set a special [factoid metadata](#factoid-metadata) key named `action_with_args` to trigger an alternate message if an argument has been supplied.