Move library to a separate crate

Keep the binaries in the root crate, and add a new crate for the
`github-suggestion` library.

I want to add some library code to the CLI programs to extract common
functionality between the different binaries.

1 files changed, 52 insertions, 0 deletions

diff --git a/github-suggestion/src/url.rs b/github-suggestion/src/url.rs
new file mode 100644
index 0000000..60a3d0e
--- /dev/null
+++ b/github-suggestion/src/url.rs
@@ -0,0 +1,52 @@
+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,
+
+    #[error("Unable to parse owner or repo")]
+    NoOwnerRepo,
+}
+
+#[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<_>>();
+
+        if path.len() < 2 {
+            return Err(Error::NoOwnerRepo);
+        }
+
+        Ok(SuggestionUrl {
+            owner: path[0].to_owned(),
+            repo: path[1].to_owned(),
+            comment_id: url.fragment()
+                .ok_or(Error::NoFragment)?
+                .replacen("discussion_r", "", 1),
+        })
+    }
+}