Implement FromStr.

source/group.rs

@@ -1,6 +1,11 @@
 //! Parsing for `/~<group>`.
 
-use {color_eyre::Result, scraper::Html};
+use std::str::FromStr;
+
+use {
+  color_eyre::{eyre::Error, Result},
+  scraper::Html,
+};
 
 use crate::{
   regexes::GROUP_SUBSCRIBERS_RE,
@@ -42,6 +47,15 @@ pub struct GroupWikiLink {
   pub url: String,
 }
 
+impl FromStr for Group {
+  type Err = Error;
+
+  fn from_str(s: &str) -> Result<Self, Self::Err> {
+    let html = Html::parse_document(s);
+    Self::from_html(&html)
+  }
+}
+
 impl Group {
   /// Parses a [`Group`] from a [`scraper::Html`] tree.
   pub fn from_html(html: &Html) -> Result<Self> {

source/group_list.rs

@@ -1,6 +1,11 @@
 //! Parsing for [`/groups`](https://tildes.net/groups).
 
-use {color_eyre::Result, scraper::Html};
+use std::str::FromStr;
+
+use {
+  color_eyre::{eyre::Error, Result},
+  scraper::Html,
+};
 
 use crate::{
   regexes::{DUPLICATE_WHITESPACE_RE, GROUP_LIST_ACTIVITY_RE},
@@ -32,6 +37,15 @@ pub struct GroupListSummary {
   pub topic_activity: Option<i32>,
 }
 
+impl FromStr for GroupList {
+  type Err = Error;
+
+  fn from_str(s: &str) -> Result<Self, Self::Err> {
+    let html = Html::parse_document(s);
+    Self::from_html(&html)
+  }
+}
+
 impl GroupList {
   /// Parses a [`GroupList`] from a [`scraper::Html`] tree.
   pub fn from_html(html: &Html) -> Result<Self> {