1 files changed, 59 insertions, 0 deletions
diff --git a/src/deck.rs b/src/deck.rs
new file mode 100644
index 0000000..384ce19
--- /dev/null
+++ b/src/deck.rs
@@ -0,0 +1,59 @@
+use crate::{model::deck::Entry, util::serialization};
+use anyhow::{Result, Error};
+use std::fs::File;
+use std::io::{prelude::*, BufReader};
+use std::fmt;
+
+#[derive(Debug, Clone)]
+struct ParseError {
+    line: usize,
+    message: String,
+}
+
+impl fmt::Display for ParseError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{} (parsing line {})", self.message, self.line)
+    }
+}
+
+impl std::error::Error for ParseError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        None
+    }
+}
+
+
+pub fn read() -> Result<Vec<Entry>> {
+    let file = File::open("deck")?;
+    let reader = BufReader::new(file);
+    let mut entries: Vec<Entry> = Vec::new();
+
+    for (index, line) in reader.lines().enumerate() {
+        let line = line?;
+        let line = line.trim();
+
+        if !line.starts_with("#") && !line.is_empty() {
+            if !line.starts_with("-") {
+                return Err(Error::from(ParseError { line: index + 1, message: "an entry should starts with “-”.".to_string() }))
+            } else {
+                let translation = line[1..].trim().split(":").collect::<Vec<&str>>();
+                if translation.len() != 2 {
+                    return Err(Error::from(ParseError { line: index + 1, message: "an entry should contain two parts separated by “:”.".to_string() }))
+                } else {
+                    let t1 = translation[0].trim();
+                    let t2 = translation[1].trim();
+                    if t1.is_empty() || t2.is_empty() {
+                        return Err(Error::from(ParseError { line: index + 1, message: "an entry should contain two parts separated by “:”.".to_string() }))
+                    } else {
+                        entries.push(Entry {
+                            part_1: serialization::line_to_words(&t1.to_string()),
+                            part_2: serialization::line_to_words(&t2.to_string()),
+                        })
+                    }
+                }
+            }
+        }
+    }
+
+    Ok(entries)
+}