Duck util-format.

doc/d-utils.md

@@ -122,7 +122,7 @@ Returns a dictionary with the following keys:
 * ```fname``` - file name (path) relative to the git repository
 
 Returns annotated source with information about originating commits
-for each line.
+for each line represented by dictionary with keys from git output.
 
 
 ## util-io [module]
@@ -340,3 +340,19 @@ Returns the (possibly improper) list of arguments the procedure
 ```proc``` accepts. If it accepts arbitrary number of arguments, it is
 signalled by simple symbol instead of pair at the last position. If it
 accepts an exact number of arguments, it returns a proper list.
+
+## util-format [module]
+
+    (import util-format)
+
+A simple module with less-common formatting functions.
+
+### format-amount [procedure]
+
+    (format-amount amt)
+
+* ```amt``` - a number
+
+Converts given number to a string with two-digit fractional
+part. Should the fractional part be 0, it is replaced with the string
+"--".