fs: switched to 1K blocks and new keys

Previous version could return 1 on one update and 900 on the next (1st
being GB, 2nd MB) a user appending "GB" to the value suddenly has a
900GB disk available. Returned keys are now: size_mb, size_gb,
used_mb, used_gb, avail_mb, avail_gb, and percentage is now: used_p.

README

@@ -177,7 +177,8 @@ vicious.widgets.fs
   - takes an (optional) argument which, if true, includes remote file
     systems, only local file systems are included by default
   - returns a table with custom keys, using mount points as a base:
-    {/ size}, {/ used}, {/ avail}, {/ usep}, {/home size} etc.
+    {/ size_mb}, {/ size_gb}, {/ used_mb}, {/ used_gb}, {/ used_p},
+    {/ avail_mb}, {/ avail_gb}, {/home size_mb} etc.
 
 vicious.widgets.dio
   - provides I/O statistics for requested storage devices

fs.lua

@@ -8,7 +8,10 @@
 local tonumber = tonumber
 local io = { popen = io.popen }
 local setmetatable = setmetatable
-local string = { match = string.match }
+local string = {
+    match = string.match,
+    format = string.format
+}
 -- }}}
 
 
@@ -16,24 +19,32 @@ local string = { match = string.match }
 module("vicious.fs")
 
 
+-- {{{ Helper functions
+local function uformat(array, key, value)
+    array["{"..key.."_mb}"] = string.format("%.1f", value/1024)
+    array["{"..key.."_gb}"] = string.format("%.1f", value/1024/1024)
+    return array
+end
+-- }}}
+
 -- {{{ Filesystem widget type
 local function worker(format, nfs)
     -- Fallback to listing only local file systems
     if nfs then nfs = "" else nfs = "--local" end
 
     -- Get data from df
-    local f = io.popen("LANG=C df -hP " .. nfs)
+    local f = io.popen("LANG=C df -kP " .. nfs)
     local fs_info = {}
 
     for line in f:lines() do
         if not string.match(line, "^Filesystem.*") then
-            local size, used, avail, usep, mount = string.match(line, --  Match all (network file systems too)
-             "^[%w%p]+[%s]+([%d%.]+)[%a]?[%s]+([%d%.]+)[%a]?[%s]+([%d%.]+)[%a]?[%s]+([%d]+)%%[%s]+([%w%p]+)$")
+            local s, u, a, p, m = string.match(line, -- Match all at once (including NFS)
+             "^[%w%p]+[%s]+([%d]+)[%s]+([%d]+)[%s]+([%d]+)[%s]+([%d]+)%%[%s]+([%w%p]+)$")
 
-            fs_info["{"..mount.." size}"]  = tonumber(size)
-            fs_info["{"..mount.." used}"]  = tonumber(used)
-            fs_info["{"..mount.." avail}"] = tonumber(avail)
-            fs_info["{"..mount.." usep}"]  = tonumber(usep)
+            uformat(fs_info, m .. " size",  s)
+            uformat(fs_info, m .. " used",  u)
+            uformat(fs_info, m .. " avail", a)
+            fs_info["{" .. m .. " used_p}"] = tonumber(p)
         end
     end
     f:close()