Use duck for util-io.

doc/d-utils.md

@@ -124,3 +124,62 @@ Returns a dictionary with the following keys:
 Returns annotated source with information about originating commits
 for each line.
 
+
+## util-io [module]
+
+    (import util-io)
+
+Module implementing advanced I/O.
+
+### read-lines/no-bom [procedure]
+
+    (read-lines/no-bom ip)
+
+
+* ```port``` - an input port
+
+Reads lines using ```read-lines``` and if the first line contains
+UTF-8 BOM, removes it.
+
+
+### get-process-output-lines [procedure]
+
+    (get-process-output-lines cmd
+                              . args)
+
+
+* ```cmd``` - a string with the command
+* ```args``` - list of arguments to pass to process
+
+Returns a list of strings representing all the lines produced by
+running the command given.
+
+
+### get-process-exit+output-lines [procedure]
+
+    (get-process-exit+output-lines cmd
+                                   . args)
+
+
+* ```cmd``` - a string with the command
+* ```args``` - list of arguments to pass to process
+
+Returns two values - an exit code and a list of strings representing
+all the lines produced by running the command given.
+
+
+### process-send/recv [procedure]
+
+    (process-send/recv cmd
+                       args
+                       . lines)
+
+
+* ```cmd``` - a string with command
+* ```args``` - list of arguments
+* ```lines``` - lines to feed to stdin of the process
+
+Executes given command ```cmd``` with given argument list ```args```
+writing all ```lines``` to its standard input and then reads all the
+process output.
+