From 3b75792081e11cfeb334b45dfb41027532a8848e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gustav=20S=C3=B6rn=C3=A4s?= <gustav@sornas.net>
Date: Fri, 13 Nov 2020 00:59:32 +0100
Subject: basic commands and write agenda to file

---
 src/agenda.rs | 58 +++++++++++++++++++++++++++++++++++++++++++---------------
 1 file changed, 43 insertions(+), 15 deletions(-)

(limited to 'src/agenda.rs')

diff --git a/src/agenda.rs b/src/agenda.rs
index 3cfcfb7..39b07a7 100644
--- a/src/agenda.rs
+++ b/src/agenda.rs
@@ -9,8 +9,8 @@ use std::{
 
 #[derive(Debug, Deserialize, Serialize)]
 pub struct AgendaPoint {
-    pub title: String,
-    pub adder: String,
+    title: String,
+    adder: String,
 }
 
 impl fmt::Display for AgendaPoint {
@@ -30,21 +30,49 @@ pub struct Agenda {
     points: Vec<AgendaPoint>,
 }
 
-pub fn read_agenda() -> Agenda {
-    serde_json::from_str::<Agenda>(
-        &fs::read_to_string("agenda.json")
-            .expect("Can't read agenda.json"))
-        .expect("Error parsing agenda.json")
+impl Agenda {
+    fn write(&self) {
+        fs::write(std::path::Path::new("agenda.json"),
+                serde_json::to_string_pretty(&self).expect("Can't serialize agenda"))
+            .expect("Can't write agenda.json");
+    }
+}
+
+pub enum ParseError {
+    NoSuchCommand,
 }
 
-pub fn write_agenda(agenda: Agenda) {
-    fs::write(std::path::Path::new("agenda.json"),
-              serde_json::to_string_pretty(&agenda).expect("Can't serialize agenda"))
-        .expect("Can't write agenda.json");
+pub fn parse_message(message: &str, sender: &str) -> Result<Option<String>, ParseError> {
+    if message.starts_with("!add ") {
+        let mut agenda = read_agenda();
+        agenda.points.push(AgendaPoint {
+            title: message[5..].to_string(),
+            adder: sender.to_string(),
+        });
+        agenda.write();
+        Ok(None)
+    } else if message.starts_with("!agenda") {
+        Ok(Some(read_agenda()
+                .points
+                .iter()
+                .map(|p| p.to_string())
+                .collect::<Vec<_>>()
+                .join("\n")))
+    } else if message.starts_with("!clear") {
+        Agenda {
+            points: Vec::new(),
+        }.write();
+        Ok(None)
+    } else if message.starts_with("!help") {
+        Ok(Some("Available commands:\n  !add\n  !agenda\n  !clear\n  !help".to_string()))
+    } else {
+        Err(ParseError::NoSuchCommand)
+    }
 }
 
-pub fn add_point(point: AgendaPoint) {
-    let mut agenda = read_agenda();
-    agenda.points.push(point);
-    write_agenda(agenda);
+fn read_agenda() -> Agenda {
+    serde_json::from_str::<Agenda>(
+        &fs::read_to_string("agenda.json")
+            .expect("Can't read agenda.json"))
+        .expect("Error parsing agenda.json")
 }
-- 
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