use itertools to group entries by sheet

Cargo.lock

@@ -130,6 +130,12 @@ version = "0.4.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "56899898ce76aaf4a0f24d914c97ea6ed976d42fec6ad33fcbb0a1103e07b2b0"
 
+[[package]]
+name = "either"
+version = "1.6.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
+
 [[package]]
 name = "fallible-iterator"
 version = "0.2.0"
@@ -180,6 +186,15 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "69ddb889f9d0d08a67338271fa9b62996bc788c7796a5c18cf057420aaed5eaf"
+dependencies = [
+ "either",
+]
+
 [[package]]
 name = "libc"
 version = "0.2.81"
@@ -404,6 +419,7 @@ dependencies = [
  "chrono",
  "clap",
  "dirs",
+ "itertools",
  "pretty_assertions",
  "rusqlite",
  "serde",

Cargo.toml

@@ -15,6 +15,7 @@ dirs = "*"
 serde = { version = "1.0", features = ["derive"] }
 serde_yaml = "0.8"
 toml = "0.5"
+itertools = "0.10"
 
 [dev-dependencies]
 pretty_assertions = "0.7.2"

src/formatters.rs

@@ -2,6 +2,7 @@ use std::str::FromStr;
 use std::io::Write;
 
 use serde::{Serialize, Deserialize};
+use itertools::Itertools;
 
 use crate::error;
 use crate::models::Entry;
@@ -16,17 +17,25 @@ pub enum Formatter {
 impl Formatter {
     pub fn print_formatted<W: Write>(&self, entries: Vec<Entry>, out: &mut W) -> error::Result<()> {
         match &self {
-            Formatter::Text => {
-                for entry in entries {
-                    writeln!(out, "{:?}", entry)?;
-                }
-            }
+            Formatter::Text => self.print_formatted_text(entries, out)?,
             Formatter::Custom(name) => {
             }
         }
 
         Ok(())
     }
+
+    /// Print in the default text format. Assume entries are sorted by sheet and
+    /// then by start
+    fn print_formatted_text<W: Write>(&self, entries: Vec<Entry>, out: &mut W) -> error::Result<()> {
+        let grouped_entries = entries.into_iter().group_by(|e| e.sheet.to_string());
+
+        for (key, group) in grouped_entries.into_iter() {
+            writeln!(out, "Timesheet: {}", key)?;
+        }
+
+        Ok(())
+    }
 }
 
 impl FromStr for Formatter {