Types, and testing formatted view

src/types.rs

@@ -0,0 +1,94 @@
+pub trait Formatted {
+    fn get_formatted(&self) -> Vec<String>;
+}
+
+pub struct WatchListItem {
+    pub symbol: String,
+    pub price: f64,
+    pub trend: f64,
+}
+
+pub struct ActivePosition {
+    pub symbol: String,
+    pub profit: f64,
+    pub lot: f64,
+}
+
+pub struct Account {
+    pub equity: f64,
+    pub liquid: f64,
+    pub unreal: f64,
+    pub realized: f64,
+    pub margin: f64,
+}
+
+impl<T: Formatted> Formatted for Vec<T> {
+    fn get_formatted(&self) -> Vec<String> {
+        let mut output = Vec::new();
+
+        let rows: Vec<Vec<String>> = self.iter().map(|v| v.get_formatted()).collect();
+
+        if rows.is_empty() {
+            return output;
+        }
+
+        let column_count = rows.iter().map(|r| r.len()).max().unwrap_or(0);
+
+        let mut widths = vec![0; column_count];
+
+        // Find the largest width per column
+        for row in &rows {
+            for (i, col) in row.iter().enumerate() {
+                widths[i] = widths[i].max(col.len());
+            }
+        }
+
+        // Render rows
+        for (row_idx, row) in rows.iter().enumerate() {
+            let mut row_out = String::new();
+
+            for (col_idx, col) in row.iter().enumerate() {
+                let width = widths[col_idx];
+
+                // Right-align numbers, left-align text could be customized here
+                row_out.push_str(&format!("{:>width$}", col, width = width));
+
+                if col_idx + 1 != row.len() {
+                    row_out.push_str("  ");
+                }
+            }
+
+            if row_idx + 1 != rows.len() {
+                output.push(row_out);
+            }
+        }
+
+        output
+    }
+}
+
+impl Formatted for WatchListItem {
+    fn get_formatted(&self) -> Vec<String> {
+        vec![
+            self.symbol.to_string(),
+            self.price.to_string(),
+            format!(
+                "{} {}",
+                if self.trend.is_sign_positive() {
+                    "▲"
+                } else {
+                    "▼"
+                },
+                self.trend.abs()
+            ),
+        ]
+    }
+}
+
+pub fn space_out(mut items: Vec<String>) -> Vec<String> {
+    for item in &mut items {
+        item.insert(0, ' ');
+    }
+
+    items
+}