cassiopeia: adding API outline

1 files changed, 13 insertions, 9 deletions

diff --git a/apps/cassiopeia/src/format/mod.rs b/apps/cassiopeia/src/format/mod.rs
index b5342d62da13..e55658d515ff 100644
--- a/apps/cassiopeia/src/format/mod.rs
+++ b/apps/cassiopeia/src/format/mod.rs
@@ -9,17 +9,21 @@ pub(crate) use parser::LineCfg;
 use crate::TimeFile;
 use std::{fs::File, io::Read};
 
-pub fn load_file(path: &str) -> TimeFile {
-    let mut f = File::open(path).unwrap();
+/// Load a file from disk and parse it into a
+/// [`TimeFile`](crate::TimeFile)
+pub fn load_file(path: &str) -> Option<TimeFile> {
+    let mut f = File::open(path).ok()?;
     let mut content = String::new();
-    f.read_to_string(&mut content).unwrap();
+    f.read_to_string(&mut content).ok()?;
 
     let mut lines: Vec<String> = content.split("\n").map(|l| l.to_owned()).collect();
 
-    lines
-        .iter_mut()
-        .map(|line| lexer::lex(line))
-        .map(|lex| parser::parse(lex))
-        .filter(|line| line.valid())
-        .fold(TimeFile::default(), |file, line| file.append(line))
+    Some(
+        lines
+            .iter_mut()
+            .map(|line| lexer::lex(line))
+            .map(|lex| parser::parse(lex))
+            .filter(|line| line.valid())
+            .fold(TimeFile::default(), |file, line| file.append(line)),
+    )
 }