From 3b37f2c3f0c49531e88e794a9baa31b8081ea8ff Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Kucharczyk?= <lukas@kucharczyk.xyz>
Date: Fri, 10 Nov 2023 20:07:41 +0100
Subject: [PATCH] Fix edge case in format_duration

Fixes #65

```python
def test_specific_precise_if_unncessary(self):
        delta = timedelta(hours=2, minutes=40)
        result = format_duration(delta, "%02.0H:%02.0m")
        self.assertEqual(result, "02:40")
```
This test fails by returning "03:40" instead. The problem is in the way `format_duration` handles fractional hours.
To fix it, we need to switch between using hours and fractional hours
depending on if minutes are present in the formatted string.
---
 common/time.py     |  4 ++--
 tests/test_time.py | 10 ++++++++++
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/common/time.py b/common/time.py
index c37f67b..be09c1f 100644
--- a/common/time.py
+++ b/common/time.py
@@ -44,7 +44,7 @@ def format_duration(
     # timestamps where end is before start
     if seconds_total < 0:
         seconds_total = 0
-    days = hours = minutes = seconds = 0
+    days = hours = hours_float = minutes = seconds = 0
     remainder = seconds = seconds_total
     if "%d" in format_string:
         days, remainder = divmod(seconds_total, day_seconds)
@@ -55,7 +55,7 @@ def format_duration(
         minutes, seconds = divmod(remainder, minute_seconds)
     literals = {
         "d": str(days),
-        "H": str(hours),
+        "H": str(hours) if "m" not in format_string else str(hours_float),
         "m": str(minutes),
         "s": str(seconds),
         "r": str(seconds_total),
diff --git a/tests/test_time.py b/tests/test_time.py
index 860475c..e910d7b 100644
--- a/tests/test_time.py
+++ b/tests/test_time.py
@@ -83,6 +83,16 @@ class FormatDurationTest(unittest.TestCase):
         result = format_duration(delta, "%r seconds")
         self.assertEqual(result, "0 seconds")
 
+    def test_specific(self):
+        delta = timedelta(hours=2, minutes=40)
+        result = format_duration(delta, "%H:%m")
+        self.assertEqual(result, "2:40")
+
+    def test_specific_precise_if_unncessary(self):
+        delta = timedelta(hours=2, minutes=40)
+        result = format_duration(delta, "%02.0H:%02.0m")
+        self.assertEqual(result, "02:40")
+
     def test_all_at_once(self):
         delta = timedelta(days=50, hours=10, minutes=34, seconds=24)
         result = format_duration(