Add ansi-color-specifier? and ansi-color-specifier-list
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So the user can check if an object is one of the symbols that specify
ANSI colors. This can be useful when writing code that takes those as
argument:
```
(define-method ascii-draw ((s <shape>) color)
;; we should check if color is a valid color here
...
)
```
And... Since we're at it, why not add a method to obtain the full list
also? :)
```
(ansi-color-specifier-list)
=> (normal bold no-bold italic no-italic underline no-underline blink
no-blink reverse no-reverse black bg-black red bg-red green
bg-green yellow bg-yellow blue bg-blue magenta bg-magenta cyan
bg-cyan white bg-white)
```
In order to do this, we include the `set!`s of all lambdas that define
procedures for ANSI color stuff under the lambda that defines the
color alist.
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So the user can check if an object is one of the symbols that specify ANSI colors. This can be useful when writing code that takes those as argument:
(define-method ascii-draw ((s <shape>) color) ;; we should check if color is a valid color here ... )And... Since we're at it, why not add a method to obtain the full list also? :)
(ansi-color-specifier-list) => (normal bold no-bold italic no-italic underline no-underline blink no-blink reverse no-reverse black bg-black red bg-red green bg-green yellow bg-yellow blue bg-blue magenta bg-magenta cyan bg-cyan white bg-white)In order to do this, we include the
set!s of all lambdas that define procedures for ANSI color stuff under the lambda that defines the color alist.@egallesio I actually have one example (for the
examplessubdirectory) that would use this... That's why I am proposing this PR.