feat: implement timer module (#118)

Implement a timer module that takes a commandline argument, the number of seconds the last job took to complete, and displays it if appropriate.

Alters shell initialization files to compute this number using date +%s where needed.

Adds a config section to configure minimum amount of time before timer is shown (default is 2s)

tests/testsuite/cmd_duration.rs

@@ -0,0 +1,80 @@
+use ansi_term::Color;
+use std::fs;
+use std::io;
+use std::path::Path;
+use tempfile::TempDir;
+
+use crate::common::{self, TestCommand};
+
+#[test]
+fn config_blank_duration_1s() -> io::Result<()> {
+    let output = common::render_module("cmd_duration")
+        .arg("--cmd-duration=1")
+        .output()?;
+    let actual = String::from_utf8(output.stdout).unwrap();
+
+    let expected = "";
+    assert_eq!(expected, actual);
+    Ok(())
+}
+
+#[test]
+fn config_blank_duration_5s() -> io::Result<()> {
+    let output = common::render_module("cmd_duration")
+        .arg("--cmd-duration=5")
+        .output()?;
+    let actual = String::from_utf8(output.stdout).unwrap();
+
+    let expected = format!("{} ", Color::Yellow.bold().paint("took 5s"));
+    assert_eq!(expected, actual);
+    Ok(())
+}
+
+#[test]
+fn config_5s_duration_3s() -> io::Result<()> {
+    let output = common::render_module("cmd_duration")
+        .use_config(toml::toml! {
+            [cmd_duration]
+            min_time = 5
+        })
+        .arg("--cmd-duration=3")
+        .output()?;
+    let actual = String::from_utf8(output.stdout).unwrap();
+
+    let expected = "";
+    assert_eq!(expected, actual);
+    Ok(())
+}
+
+#[test]
+fn config_5s_duration_10s() -> io::Result<()> {
+    let output = common::render_module("cmd_duration")
+        .use_config(toml::toml! {
+            [cmd_duration]
+            min_time = 5
+        })
+        .arg("--cmd-duration=10")
+        .output()?;
+    let actual = String::from_utf8(output.stdout).unwrap();
+
+    let expected = format!("{} ", Color::Yellow.bold().paint("took 10s"));
+    assert_eq!(expected, actual);
+    Ok(())
+}
+
+#[test]
+fn config_disabled() -> io::Result<()> {
+    let output = common::render_module("cmd_duration")
+        .use_config(toml::toml! {
+            [cmd_duration]
+            disabled = true
+            min_time = 5
+        })
+        .arg("--cmd-duration=10")
+        .output()?;
+    let actual = String::from_utf8(output.stdout).unwrap();
+
+    let expected = "";
+    assert_eq!(expected, actual);
+    Ok(())
+}

tests/testsuite/main.rs

@@ -1,4 +1,5 @@
 mod character;
+mod cmd_duration;
 mod common;
 mod configuration;
 mod directory;