Lines of src/command.rs from check-in 093ae6c75b that are changed by the sequence of edits moving toward check-in 28da2e2a00:

                         1: use anyhow::{bail, Context, Result};
                         2: use crate::core::Core;
                         3: use regex::Regex;
                         4: use sedregex::ReplaceCommand;
                         5: use std::borrow::Cow;
                         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<()> {
                        14: 	core.send("We are open. Probably. Visit [channel](https://t.me/rsstg_bot_help/3) for details.", Some(sender), None).await?;
                        15: 	Ok(())
                        16: }
                        17: 
                        18: pub async fn list(core: &Core, sender: telegram_bot::UserId) -> Result<()> {
                        19: 	core.send(core.list(sender).await?, Some(sender), Some(telegram_bot::types::ParseMode::MarkdownV2)).await?;
                        20: 	Ok(())
                        21: }
                        22: 
                        23: pub async fn command(core: &Core, sender: telegram_bot::UserId, command: Vec<&str>) -> Result<()> {
                        24: 	let msg: Cow<str> = match &command[1].parse::<i32>() {
                        25: 		Err(err) => format!("I need a number.\n{}", &err).into(),
                        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?.into(),
                        31: 			"/delete" => core.delete(number, sender).await?,
                        32: 			"/disable" => core.disable(number, sender).await?.into(),
                        33: 			_ => bail!("Command {} not handled.", &command[0]),
                        34: 		},
                        35: 	};
                        36: 	core.send(msg, Some(sender), None).await?;
                        37: 	Ok(())
                        38: }
                        39: 
                        40: pub async fn update(core: &Core, sender: telegram_bot::UserId, command: Vec<&str>) -> Result<()> {
                        41: 	let mut source_id: Option<i32> = None;
                        42: 	let at_least = "Requires at least 3 parameters.";
                        43: 	let first_word = command[0];
                        44: 	let command = match first_word {
                        45: 		"/update" => {
                        46: 			source_id = Some(command[1].parse::<i32>()
                        47: 				.context(format!("I need a number, but got {}.", command[1]))?);
                        48: 			&command[2..]
                        49: 		},
                        50: 		"/add" => &command[1..],
                        51: 		_ => bail!("Passing {} is not possible here.", command[1]),
                        52: 	};
                        53: 	let mut i_command = command.iter();
                        54: 	let (channel, url, iv_hash, url_re) = (
                        55: 		i_command.next().context(at_least)?,
                        56: 		i_command.next().context(at_least)?,
                        57: 		i_command.next(),
                        58: 		i_command.next());
                        59: 	if ! RE_USERNAME.is_match(channel) {
                        60: 		bail!("Usernames should be something like \"@\\[a\\-zA\\-Z]\\[a\\-zA\\-Z0\\-9\\_]+\", aren't they?\nNot {:?}", &channel);
                        61: 	};
                        62: 	if ! RE_LINK.is_match(url) {
                        63: 		bail!("Link should be a link to atom/rss feed, something like \"https://domain/path\".\nNot {:?}", &url);
                        64: 	}
                        65: 	let iv_hash = match iv_hash {
                        66: 		Some(hash) => {
                        67: 			match *hash {
                        68: 				"-" => None,
                        69: 				thing => {
                        70: 					if ! RE_IV_HASH.is_match(thing) {
                        71: 						bail!("IV hash should be 14 hex digits.\nNot {:?}", thing);
                        72: 					};
                        73: 					Some(thing)
                        74: 				},
                        75: 			}
                        76: 		},
                        77: 		None => None,
                        78: 	};
                        79: 	let url_re = match url_re {
                        80: 		Some(re) => {
                        81: 			match *re {
                        82: 				"-" => None,
                        83: 				thing => {
                        84: 					let _url_rex = ReplaceCommand::new(thing).context("Regexp parsing error:")?;
                        85: 					Some(thing)
                        86: 				}
                        87: 			}
                        88: 		},
                        89: 		None => None,
                        90: 	};
                        91: 	let channel_id = i64::from(core.tg.send(telegram_bot::GetChat::new(telegram_bot::ChatRef::ChannelUsername(channel.to_string()))).await?.id());
                        92: 	let chan_adm = core.tg.send(telegram_bot::GetChatAdministrators::new(telegram_bot::ChatRef::ChannelUsername(channel.to_string()))).await
                        93: 		.context("Sorry, I have no access to that chat.")?;
                        94: 	let (mut me, mut user) = (false, false);
                        95: 	for admin in chan_adm {
                        96: 		if admin.user.id == core.my.id {
                        97: 			me = true;
                        98: 		};
                        99: 		if admin.user.id == sender {
                       100: 			user = true;
                       101: 		};
                       102: 	};
                       103: 	if ! me   { bail!("I need to be admin on that channel."); };
                       104: 	if ! user { bail!("You should be admin on that channel."); };
                       105: 	core.send(core.update(source_id, channel, channel_id, url, iv_hash, url_re, sender).await?, Some(sender), None).await?;
                       106: 	Ok(())
                       107: }