2 files changed, 46 insertions, 1 deletions
diff --git a/hooked/Cargo.toml b/hooked/Cargo.toml
index acde074..d0781e0 100644
--- a/hooked/Cargo.toml
+++ b/hooked/Cargo.toml
@@ -11,3 +11,4 @@ anyhow = "1.0"
 paw = "1.0"
 shared = { path = "../shared" }
 structopt = { version = "0.3", features = ["paw"] }
+unicode-segmentation = "1.3"
diff --git a/hooked/src/bin/hooked-commit-msg.rs b/hooked/src/bin/hooked-commit-msg.rs
index 80a1832..7f2a996 100644
--- a/hooked/src/bin/hooked-commit-msg.rs
+++ b/hooked/src/bin/hooked-commit-msg.rs
@@ -1,3 +1,47 @@
+use shared::find_root;
+use std::{
+  env::args,
+  error::Error,
+  fs,
+  process,
+};
+use unicode_segmentation::UnicodeSegmentation;
+
 fn main() {
-  println!("Hello, world!");
+  if let Err(e) = || -> Result<(), Box<dyn Error>> {
+    let path = find_root()?.join(args().last().ok_or_else(|| {
+      "Expected to be passed a path to the git commit message"
+    })?);
+
+    let file = fs::read_to_string(path)?;
+    let mut lines = file.lines();
+
+    if let Some(ref first_line) = lines.next() {
+      let length = first_line.graphemes(true).count();
+      if length > 50 {
+        return Err(
+          "Your commit header is over 50 characters (i.e. graphemes) in length.\n\
+           Commit messages titles should be between 10 to 50 characters".into());
+      }
+      if length < 10 {
+        return Err(
+          "Your commit header is less than 10 characters (i.e. graphemes) in length.\n\
+           Commit messages titles should be between 10 to 50 characters".into());
+      }
+    }
+
+    for line in lines {
+      let length = line.graphemes(true).count();
+      if length > 72 {
+        return Err(
+          "One of the lines in the body of the commit is over 72 characters (i.e. graphemes) in \n\
+           length. Commit messages titles should be between 10 to 50 characters".into());
+      }
+    }
+
+    Ok(())
+  }() {
+    eprintln!("{}", e);
+    process::exit(1);
+  }
 }