filters: add humanize filter

app/utils/filters/__init__.py

@@ -1,3 +1,3 @@
 # Register filters here
 
-from app.utils.filters import date, is_title, markdown, pluralize
+from app.utils.filters import date, humanize, is_title, markdown, pluralize

app/utils/filters/humanize.py

@@ -0,0 +1,26 @@
+from app import app
+
+
+@app.template_filter('humanize')
+def humanize(n:float, sd:int=4, unit:str=''):
+    """
+    Print the number human-readable.
+    n: number
+    sd: significant digits
+    unit: unit
+    Ex: humanize(12345, 2, "o") → 12.34 ko
+    """
+
+    suffixes = ['k', 'M', 'G', 'T', 'P']
+    suffix = ''
+
+    for s in suffixes:
+        if abs(n) > 10**3:
+            n /= 10**3
+            suffix = s
+        else:
+            break
+
+    formatter = f"{{:.{sd}n}}{{}}{{}}{{}}"
+    spacer = ' ' if suffix + unit != '' else ''
+    return formatter.format(float(n), spacer, suffix, unit)