Pseudo pseudorandom color picker

src/lib.rs

@@ -1,5 +1,5 @@
 use config::Config;
-use std::path::PathBuf;
+use std::{hash::{DefaultHasher, Hash, Hasher}, path::PathBuf};
 
 pub mod config;
 pub mod log;
@@ -13,3 +13,11 @@ pub fn load_config() -> Config {
     }
     Config::new(PathBuf::from("./config.toml"))
 }
+
+/// Get random-like color id in range 0..16 by computing string hash
+pub fn color_id_from_name(name: String) -> i32 {
+    let mut s = DefaultHasher::new();
+    name.hash(&mut s);
+    let hash = s.finish();
+    (hash.count_ones() / 4) as i32
+}

src/main.rs

@@ -3,7 +3,7 @@
 
 use std::{error::Error, rc::Rc, sync::{Arc, Mutex}};
 
-use aliveline::{config::Config, load_config, log::{Event, Log}};
+use aliveline::{color_id_from_name, config::Config, load_config, log::{Event, Log}};
 use chrono::{Datelike, Timelike};
 use slint::{Model, ModelRc, SharedString, ToSharedString, VecModel, Weak};
 use toml::value::{Date as TomlDate, Time};
@@ -22,7 +22,8 @@ impl From<Event> for TimelineEvent {
             start,
             duration: end - start,
             label: event.name.to_shared_string(),
-            finished: event.finished
+            finished: event.finished,
+            color_id: color_id_from_name(event.name)
         }
     }
 }
@@ -143,8 +144,9 @@ fn main() -> Result<(), Box<dyn Error>> {
             let event = TimelineEvent {
                 duration: 0,
                 finished: false,
-                label: event_name,
-                start: offset
+                label: event_name.clone(),
+                start: offset,
+                color_id: color_id_from_name(event_name.to_string())
             };
             
             {
@@ -177,8 +179,9 @@ fn main() -> Result<(), Box<dyn Error>> {
             let new_event = TimelineEvent { 
                 duration: offset - event.start,
                 finished: true,
-                label: event.label,
-                start: event.start
+                label: event.label.clone(),
+                start: event.start,
+                color_id: color_id_from_name(event.label.to_string())
             };
 
             {
@@ -215,7 +218,7 @@ fn main() -> Result<(), Box<dyn Error>> {
                 let maybe_unfinished_event = log_guard.events.iter().find(|event| !event.finished);
                 match maybe_unfinished_event {
                     Some(unfinished_event) => Some(Event::new(unfinished_event.name.clone(), 0, 0, false)),
-                    None => None
+                    _ => None
                 }
             };