Lines of src/command.rs from check-in 9171c791eb that are changed by the sequence of edits moving toward check-in a7f91033c0:

                         1: use anyhow::{bail, Context, Result};
                         2: use crate::core::Core;
                         3: use regex::Regex;
                         4: use sedregex::ReplaceCommand;
                         5: use telegram_bot;
                         6: 
                         7: lazy_static! {
                         8: 	static ref RE_USERNAME: Regex = Regex::new(r"^@[a-zA-Z][a-zA-Z0-9_]+$").unwrap();
                         9: 	static ref RE_LINK: Regex = Regex::new(r"^https?://[a-zA-Z.0-9-]+/[-_a-zA-Z.0-9/?=]+$").unwrap();
                        10: 	static ref RE_IV_HASH: Regex = Regex::new(r"^[a-f0-9]{14}$").unwrap();
                        11: }
                        12: 
                        13: pub async fn start(core: &Core, sender: telegram_bot::UserId) -> Result<()> {
9171c791eb 2021-11-13   14: 	core.send("We are open\\. Probably\\. Visit [channel](https://t.me/rsstg_bot_help/3) for details\\.", Some(sender))?;
                        15: 	Ok(())
                        16: }
                        17: 
                        18: pub async fn list(core: &Core, sender: telegram_bot::UserId) -> Result<()> {
9171c791eb 2021-11-13   19: 	core.send(core.list(sender).await?.join("\n"), Some(sender))?;
                        20: 	Ok(())
                        21: }
                        22: 
                        23: pub async fn command(core: &Core, sender: telegram_bot::UserId, command: Vec<&str>) -> Result<()> {
                        24: 	core.send( match &command[1].parse::<i32>() {
                        25: 		Err(err) => format!("I need a number\\.\n{}", &err),
                        26: 		Ok(number) => match command[0] {
                        27: 			"/check" => core.check(&number, sender, false).await
                        28: 				.context("Channel check failed.")?,
                        29: 			"/clean" => core.clean(&number, sender).await?,
                        30: 			"/enable" => core.enable(&number, sender).await?
                        31: 				.to_string(),
                        32: 			"/delete" => core.delete(&number, sender).await?,
                        33: 			"/disable" => core.disable(&number, sender).await?
                        34: 				.to_string(),
                        35: 			_ => bail!("Command {} not handled.", &command[0]),
                        36: 		},
9171c791eb 2021-11-13   37: 	}, Some(sender))?;
                        38: 	Ok(())
                        39: }
                        40: 
                        41: pub async fn update(core: &Core, sender: telegram_bot::UserId, command: Vec<&str>) -> Result<()> {
                        42: 	let mut source_id: Option<i32> = None;
                        43: 	let at_least = "Requires at least 3 parameters.";
                        44: 	let first_word = command[0];
                        45: 	let command = match first_word {
                        46: 		"/update" => {
                        47: 			source_id = Some(command[1].parse::<i32>()
                        48: 				.context(format!("I need a number, but got {}.", command[1]))?);
                        49: 			&command[2..]
                        50: 		},
                        51: 		"/add" => &command[1..],
                        52: 		_ => bail!("Passing {} is not possible here.", command[1]),
                        53: 	};
                        54: 	let mut i_command = command.into_iter();
                        55: 	let (channel, url, iv_hash, url_re) = (
                        56: 		i_command.next().context(at_least)?,
                        57: 		i_command.next().context(at_least)?,
                        58: 		i_command.next(),
                        59: 		i_command.next());
                        60: 	if ! RE_USERNAME.is_match(&channel) {
9171c791eb 2021-11-13   61: 		core.send(format!("Usernames should be something like \"@\\[a\\-zA\\-Z]\\[a\\-zA\\-Z0\\-9\\_]+\", aren't they?\nNot {:?}", &channel), Some(sender))?;
                        62: 		return Ok(())
                        63: 	}
                        64: 	if ! RE_LINK.is_match(&url) {
9171c791eb 2021-11-13   65: 		core.send(format!("Link should be a link to atom/rss feed, something like \"https://domain/path\".\nNot {:?}", &url), Some(sender))?;
                        66: 		return Ok(())
                        67: 	}
                        68: 	let iv_hash = match iv_hash {
                        69: 		Some(hash) => {
                        70: 			if ! RE_IV_HASH.is_match(hash) {
9171c791eb 2021-11-13   71: 				core.send(format!("IV hash should be 14 hex digits.\nNot {:?}", hash), Some(sender))?;
                        72: 				return Ok(())
                        73: 			};
                        74: 			Some(*hash)
                        75: 		}
                        76: 		None => None,
                        77: 	};
                        78: 	if let Some(rex) = url_re {
                        79: 		let _url_rex = ReplaceCommand::new(rex).context("Regexp parsing error:")?;
                        80: 	};
                        81: 	let channel_id = i64::from(core.tg.send(telegram_bot::GetChat::new(telegram_bot::types::ChatRef::ChannelUsername(channel.to_string()))).await?.id());
                        82: 	let chan_adm = core.tg.send(telegram_bot::GetChatAdministrators::new(telegram_bot::types::ChatRef::ChannelUsername(channel.to_string()))).await
                        83: 		.context("Sorry, I have no access to that chat\\.")?;
                        84: 	let (mut me, mut user) = (false, false);
                        85: 	for admin in chan_adm {
                        86: 		if admin.user.id == core.my.id {
                        87: 			me = true;
                        88: 		};
                        89: 		if admin.user.id == sender {
                        90: 			user = true;
                        91: 		};
                        92: 	};
                        93: 	if ! me   { bail!("I need to be admin on that channel\\."); };
                        94: 	if ! user { bail!("You should be admin on that channel\\."); };
9171c791eb 2021-11-13   95: 	core.send(core.update(source_id, channel, channel_id, url, iv_hash, None, sender).await?, Some(sender))
                        96: }