Add a new 'css' format, which further abbreviates base 1000 suffixes

README.md

@@ -43,9 +43,10 @@ Default base if it is not clear what the unit is (i.e. if it is not 'mib' or 'me
 - format type:      `[hH][size_format][^exponent]`
     - `h`:              Base 1000
     - `H`:              Base 1024
-- `size_format`:    `c | cs | cv | e | ev | s | sv`
+- `size_format`:    `c | cs | css | cv | e | ev | s | sv`
     - `c`:              Commonly used case-sensitive suffixes 
     - `cs`:             Commonly used abbreviated case-sensitive suffixes
+    - `css`:            Similar to `cs` but even more abbreviated `Base 1000` (e.g. `k` instead of ` kb`)
     - `cv`:             Commonly used verbose case-sensitive suffixes
     - `e`:              IEC suffixes
     - `ev`:             IEC verbose suffixes

hfilesize/hfilesize.py

@@ -54,6 +54,31 @@ class Format:
         ],
     }
 
+    casing_shorter = {
+        1024: [
+            '',
+            'K',
+            'M',
+            'G',
+            'T',
+            'P',
+            'E',
+            'Z',
+            'Y',
+        ],
+        1000: [
+            '',
+            'k',
+            'm',
+            'g',
+            't',
+            'p',
+            'e',
+            'z',
+            'y',
+        ],
+    }
+
     casing_verbose = {
         1024: [
             (' byte', ' bytes'),
@@ -281,21 +306,22 @@ def __format__(self, fmt):
         '''
         format specification:
             format type:    [hH][size_format][^exponent]
-            size_format:    c | cs | cv | e | ev | s | sv
+            size_format:    c | cs | css | cv | e | ev | s | sv
             exponent:       integer
 
         base is required sometimes if no exponent is specified
         always specifying the base gives a shorter format specification
         '''
         # is it an empty format or not a special format for the size class
-        matches = re.search(r'([hH])(?:(c|cs|cv|e|ev|s|sv)?(?:\^(\d+))?)?$', fmt)
+        matches = re.search(r'([hH])(?:(c|cs|css|cv|e|ev|s|sv)?(?:\^(\d+))?)?$', fmt)
         if not matches:
             return int(self).__format__(fmt)
         fmt_type, size_fmt, exponent = matches.groups()
         size_fmt = {
             None:   Format.casing,
             'c':    Format.casing,
             'cs':   Format.casing_short,
+            'css':  Format.casing_shorter,
             'cv':   Format.casing_verbose,
             'e':    Format.iec,
             'ev':   Format.iec_verbose,

setup.py

@@ -11,7 +11,7 @@
 
 setup(
     name='hfilesize',
-    version='0.1.0',
+    version='0.2.0',
     license='MIT',
     description='Human Readable File Sizes',
     long_description=long_description,