Function egg_mode_text::characters_remaining
[−]
[src]
pub fn characters_remaining(
text: &str,
max: usize,
http_url_len: i32,
https_url_len: i32
) -> (usize, bool)
Returns how many characters would remain with the given text, if the given bound were used as a maximum. Also returns an indicator of whether the given text is a valid length to post with that maximum.
This function exists as a sort of convenience method to allow clients to call one uniform method to show a remaining character count on a tweet compose box, and to conditionally enable a "submit" button.
For the http_url_len
and https_url_len
parameters, call GET help/configuration
on the
Twitter API (in the egg-mode
crate, this is exposed in egg_mode::service::config
) and use
the short_url_len
and short_url_len_https
fields on the struct that's returned. If you want
to perform these checks offline, twitter-text's sample code and tests assume 23 characters for
both sizes. At the time of this writing (2016-11-28), those numbers were also being returned
from the service itself.
If you're writing text for a direct message and want to know how many characters are available
in that context, see GET help/configuration
in the Twitter API (in the egg-mode
crate,
this is exposed in egg_mode::service::config
) and the dm_text_character_limit
returned by
that endpoint, then call character_count
and subtract the result from the configuration
value.
Examples
use egg_mode_text::characters_remaining; let (count, _) = characters_remaining("This is a test.", 280, 23, 23); assert_eq!(count, 280 - 15); // URLs get replaced by a t.co URL of the given length let (count, _) = characters_remaining("test.com", 280, 23, 23); assert_eq!(count, 280 - 23); // Multiple URLs get shortened individually let (count, _) = characters_remaining("Test https://test.com test https://test.com test.com test", 280, 23, 23); assert_eq!(count, 280 - 86);