forgot to commit openos

data/openos/bin/sleep.lua

@@ -0,0 +1,60 @@
+local shell = require("shell")
+local args, options = shell.parse(...)
+
+if options.help then
+  print([[Usage: sleep NUMBER[SUFFIX]...
+Pause for NUMBER seconds.  SUFFIX may be 's' for seconds (the default),
+'m' for minutes, 'h' for hours or 'd' for days.  Unlike most implementations
+that require NUMBER be an integer, here NUMBER may be an arbitrary floating
+point number.  Given two or more arguments, pause for the amount of time
+specified by the sum of their values.]])
+end
+
+local function help(bad_arg)
+  print("sleep: invalid option -- '"..tostring(bad_arg).."'")
+  print("Try 'sleep --help' for more information.")
+end
+
+local function time_type_multiplier(time_type)
+  if not time_type or #time_type == 0 or time_type == 's' then
+    return 1
+  elseif time_type == 'm' then
+    return 60
+  elseif time_type == 'h' then
+    return 60 * 60
+  elseif time_type == 'd' then
+    return 60 * 60 * 24
+  end
+
+  -- weird error, my bad
+  assert(false,'bug parsing parameter:'..tostring(time_type))
+end
+
+options.help = nil
+if next(options) then
+  help(next(options))
+  return 1
+end
+
+local total_time = 0
+
+for _,v in ipairs(args) do
+  local interval, time_type = v:match('^([%d%.]+)([smhd]?)$')
+  interval = tonumber(interval)
+
+  if not interval or interval < 0 then
+    help(v)
+    return 1
+  end
+
+  total_time = total_time + time_type_multiplier(time_type) * interval
+end
+
+local ins = io.stdin.stream
+local pull = ins.pull
+local start = 1
+if not pull then
+  pull = require("event").pull
+  start = 2
+end
+pull(select(start, ins, total_time, "interrupted"))