Merge pull request #1805 from Abperron/enh-2047-log-show-last-x

[enh] Implement 'yunohost log show last' to display the last log file.

share/actionsmap.yml

@@ -1976,7 +1976,7 @@ log:
                 - display
             arguments:
                 path:
-                    help: Log file which to display the content
+                    help: Log file which to display the content. 'last' or 'last-X' selects the last but X log file
                 -n:
                     full: --number
                     help: Number of lines to display

src/log.py

@@ -173,6 +173,20 @@ def log_show(
         share
     """
 
+    # Set up path with correct value if 'last' or 'last-X' magic keywords are used
+    last = re.match(r"last(?:-(?P<position>[0-9]{1,6}))?$", path)
+    if last:
+        position = 1
+        if last.group("position") is not None:
+            position += int(last.group("position"))
+
+        logs = list(log_list()["operation"])
+
+        if position > len(logs):
+            raise YunohostValidationError(f"There isn't that many logs", raw_msg=True)
+
+        path = logs[-position]["path"]
+
     if share:
         filter_irrelevant = True