bak plugin: bak renamed to mvbak, cpbak added

plugins/bak/bak.fish

-# Function to rename files and directories (a.txt -> a.txt.20140608_195859.bak)
-# (c) Roman Inflianskas (rominf) <infroma@gmail.com>, 2014
-
-function bak
-  for arg in $argv
-    # trim / for directories
-    set arg (echo $arg | sed "s/\///")
-    mv $arg $arg.(date +"%Y%m%d_%H%M%S").bak
-  end
-end

plugins/bak/bak.load

+function __bak_name
+  # trim / for directories
+  set arg (echo $argv[1] | sed "s/\///")
+  echo "$arg.(date +"%Y%m%d_%H%M%S").bak"
+end
+
+function __bak
+  set program $argv[1]
+  for arg in $argv[2..-1]
+    eval $program $arg (__bak_name $arg)
+  end
+end

plugins/bak/cpbak.fish

+# Function to copy files and directories (a.txt copy to a.txt.20140608_195859.bak)
+# (c) Roman Inflianskas (rominf) <infroma@gmail.com>, 2014
+
+function cpbak
+  __bak cp $argv
+end

plugins/bak/mvbak.fish

+# Function to rename files and directories (a.txt rename to a.txt.20140608_195859.bak)
+# (c) Roman Inflianskas (rominf) <infroma@gmail.com>, 2014
+
+function mvbak
+  __bak mv $argv
+end