support data with line breaks

src/tabulate.rs

@@ -61,15 +61,41 @@ impl Tabulate {
     }
 
     pub fn feed(&mut self, data: Vec<String>) {
-        for (w, d) in self.widths.iter_mut().zip(data.iter()) {
-            let count = d.chars().count();
+        let mut lines: Vec<Vec<String>> = Vec::new();
 
-            if count > *w {
-                *w = count;
+        for (col, (w, d)) in self.widths.iter_mut().zip(data.iter()).enumerate() {
+            for (row, dl) in d.split("\n").enumerate() {
+                let count = dl.chars().count();
+
+                if count > *w {
+                    *w = count;
+                }
+
+                if let Some(line) = lines.get_mut(row) {
+                    if let Some(pos) = line.get_mut(col) {
+                        *pos = dl.into();
+                    } else {
+                        line.push(dl.into());
+                    }
+                } else {
+                    lines.push({
+                        let mut prev = if row == 0 {
+                            data[..col].to_vec()
+                        } else {
+                            (0..col).map(|_| "".into()).collect()
+                        };
+
+                        prev.push(dl.into());
+
+                        prev
+                    });
+                }
             }
         }
 
-        self.data.push(DataOrSep::Data(data));
+        for line in lines {
+            self.data.push(DataOrSep::Data(line));
+        }
     }
 
     pub fn separator(&mut self, c: char) {