From f8dafb20c00678a5149e4e6e0a2d5cd4f35b5635 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Mon, 30 Aug 2021 00:26:41 +0200
Subject: [PATCH] Support empty digits in format_number of Report

issue10678
review365801002
---
 CHANGELOG                |  1 +
 trytond/report/report.py | 11 +++++++++--
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG b/CHANGELOG
index 5050f7a18e..88a395c3cf 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,4 @@
+* Support empty digits in format_number of Report
 * Add digits mixin
 * Use argon2 or scrypt to hash password by default
 * Allow PYSON Expression as key for PYSON In with dict object
diff --git a/trytond/report/report.py b/trytond/report/report.py
index 621b95a7d5..36c55a871d 100644
--- a/trytond/report/report.py
+++ b/trytond/report/report.py
@@ -12,6 +12,8 @@ import time
 import warnings
 import zipfile
 import operator
+
+from decimal import Decimal
 from email.mime.multipart import MIMEMultipart
 from email.mime.text import MIMEText
 from io import BytesIO
@@ -439,12 +441,17 @@ class Report(URLMixin, PoolBase):
         return lang.currency(value, currency, symbol, grouping, digits=digits)
 
     @classmethod
-    def format_number(cls, value, lang, digits=2, grouping=True,
-            monetary=None):
+    def format_number(
+            cls, value, lang, digits=None, grouping=True, monetary=None):
         pool = Pool()
         Lang = pool.get('ir.lang')
         if lang is None:
             lang = Lang.get()
+        if digits is None:
+            d = value
+            if not isinstance(d, Decimal):
+                d = Decimal(repr(value))
+            digits = -int(d.as_tuple().exponent)
         return lang.format('%.' + str(digits) + 'f', value,
             grouping=grouping, monetary=monetary)