Add git-sugapply bin

An executable to apply a suggested change to the appropriate file in the
repo.

Add a new `SuggestionUrl` type that allows us to extract the necessary
data to fetch a suggestion comment from the GitHub API using a GitHub
pull request comment URL.

3 files changed, 76 insertions, 1 deletions

diff --git a/src/bin/git-sugapply.rs b/src/bin/git-sugapply.rs
new file mode 100644
index 0000000..d569147
--- /dev/null
+++ b/src/bin/git-sugapply.rs
@@ -0,0 +1,25 @@
+use std::env;
+use std::process;
+
+use git_suggested_patch::{Client, SuggestionUrl};
+
+
+fn main() {
+    let args: Vec<_> = env::args().collect();
+
+    if args.len() < 2 {
+        process::exit(111);
+    }
+
+    let url: SuggestionUrl = args[1].parse().unwrap();
+
+    let client = Client::new(
+        env!("GITHUB_TOKEN"),
+        &url.owner,
+        &url.repo,
+    );
+
+    let suggestion = client.fetch(&url.comment_id).unwrap();
+
+    suggestion.apply().unwrap();
+}
diff --git a/src/lib.rs b/src/lib.rs
index 3b94993..2febe7d 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,6 +1,11 @@
 #![warn(rust_2018_idioms)]
 
 
+mod url;
+
+pub use crate::url::SuggestionUrl;
+
+
 use std::fs;
 use std::fs::{File, OpenOptions};
 use std::io::{BufRead, BufReader, Write};
@@ -109,7 +114,7 @@ impl Suggestion {
         s.replace("```", "")
     }
 
-    fn apply(&self) -> Result<(), Error> {
+    pub fn apply(&self) -> Result<(), Error> {
         let repo = Repository::open(".").unwrap();
         let repo_root = repo.workdir().unwrap();
 
diff --git a/src/url.rs b/src/url.rs
new file mode 100644
index 0000000..d635d6f
--- /dev/null
+++ b/src/url.rs
@@ -0,0 +1,45 @@
+use std::str::FromStr;
+
+use thiserror::Error;
+
+use url;
+use url::Url;
+
+
+#[derive(Debug, Error)]
+pub enum Error {
+    #[error("Unable to parse URL")]
+    Url(#[from] url::ParseError),
+
+    #[error("URL has no path")]
+    NoPath,
+
+    #[error("URL has no fragment")]
+    NoFragment,
+}
+
+#[derive(Debug)]
+pub struct SuggestionUrl {
+    pub owner: String,
+    pub repo: String,
+    pub comment_id: String,
+}
+
+impl FromStr for SuggestionUrl {
+    type Err = Error;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
+        let url = Url::parse(s)?;
+        let path = url.path_segments()
+            .ok_or(Error::NoPath)?
+            .collect::<Vec<_>>();
+
+        Ok(SuggestionUrl {
+            owner: path[0].to_owned(),
+            repo: path[1].to_owned(),
+            comment_id: url.fragment()
+                .ok_or(Error::NoFragment)?
+                .replacen("discussion_r", "", 1),
+        })
+    }
+}