local fs=require("filesystem")
local shell=require("shell")
local text=require("text")

local args,options=shell.parse(...)

local function formatSize(size)
if not options.h then
return tostring(size)
elseif type(size)=="string"then
return size
end
local sizes={"","K","M","G"}
local unit=1
local power=options.si and 1000 or 1024
while size>power and unit<#sizes do
unit=unit+1
size=size/power
end
return math.floor(size*10)/10 ..sizes[unit]
end

local mounts={}
if#args==0 then
for proxy,path in fs.mounts()do
if not mounts[proxy]or mounts[proxy]:len()>path:len()then
mounts[proxy]=path
end
end
else
for i=1,#args do
local proxy,path=fs.get(shell.resolve(args[i]))
if not proxy then
io.stderr:write(args[i],": no such file or directory\n")
else
mounts[proxy]=path
end
end
end

local result={{"Filesystem","Used","Available","Use%","Mounted on"}}
for proxy,path in pairs(mounts)do
local label=proxy.getLabel()or proxy.address
local used,total=proxy.spaceUsed(),proxy.spaceTotal()
local available,percent
if total==math.huge then
used=used or"N/A"
available="unlimited"
percent="0%"
else
available=total-used
percent=used/total
if percent~=percent then
available="N/A"
percent="N/A"
else
percent=math.ceil(percent*100).."%"
end
end
table.insert(result,{label,formatSize(used),formatSize(available),tostring(percent),path})
end

local m={}
for _,row in ipairs(result)do
for col,value in ipairs(row)do
m[col]=math.max(m[col]or 1,value:len())
end
end

for _,row in ipairs(result)do
for col,value in ipairs(row)do
local padding=col==#row and 0 or 2
io.write(text.padRight(value,m[col]+padding))
end
print()
end