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Installing
==========

You don't need to install anything.

You can run ranger by simply starting the executable file ranger.py
in the top directory of this package.
Use the --clean option and it will leave no trace whatsoever on your system.


If you insist on conventionally install it, use the package manager
of your operating system.  If there is no package or it is out of date,
you can also follow these instructions:


Step by step
============

(This is all done automagically if you type `sudo make install',
though you might want to read the Makefile first)

0. Make sure you have a recent version of python, including the
   curses module, which is the case if this shell command prints no errors:
   python -c 'import curses'


1. Copy the file "ranger.py" into any of the directories in the PATH
   environment variable, for example to "/usr/bin/ranger"


2. Copy the directory "ranger" into one of the python module search
   paths, for example to "/usr/lib/python2.6/site-packages/ranger".

   Ensure that the path is listed by the command:
   python -c 'import sys; print("\n".join(sys.path))'


Uninstalling
============

Use your package manager to uninstall ranger.  If you manually installed
it, revert the steps described above.

Ranger can also create a configuration directory at ~/.ranger which
you might want to remove as well.
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# Mu synchronizes using channels rather than locks, like Erlang and Go.
#
# The two ends of a channel will usually belong to different routines, but
# each end should only be used by a single one. Don't try to read from or
# write to it from multiple routines at once.
#
# The key property of channels is that writing to a full channel or reading
# from an empty one will put the current routine in 'waiting' state until the
# operation can be completed.

scenario channel [
  run [
    1:address:channel <- new-channel 3/capacity
    1:address:channel <- write 1:address:channel, 34
    2:number, 1:address:channel <- read 1:address:channel
  ]
  memory-should-contain [
    2 <- 34
  ]
]

container channel [
  # To avoid locking, writer and reader will never write to the same location.
  # So channels will include fields in pairs, one for the writer and one for the
  # reader.
  first-full:number  # for write
  first-free:number  # for read
  # A circular buffer contains values from index first-full up to (but not
  # including) index first-empty. The reader always modifies it at first-full,
  # while the writer always modifies it at first-empty.
  data:address:array:location
]

# result:address:channel <- new-channel capacity:number
recipe new-channel [
  local-scope
  # result = new channel
  result:address:channel <- new channel:type
  # result.first-full = 0
  full:address:number <- get-address *result, first-full:offset
  *full <- copy 0
  # result.first-free = 0
  free:address:number <- get-address *result, first-free:offset
  *free <- copy 0
  # result.data = new location[ingredient+1]
  capacity:number <- next-ingredient
  capacity <- add capacity, 1  # unused slot for 'full?' below
  dest:address:address:array:location <- get-address *result, data:offset
  *dest <- new location:type, capacity
  reply result
]

# chan <- write chan:address:channel, val:location
recipe write [
  local-scope
  chan:address:channel <- next-ingredient
  val:location <- next-ingredient
  {
    # block if chan is full
    full:boolean <- channel-full? chan
    break-unless full
    full-address:address:number <- get-address *chan, first-full:offset
    wait-for-location *full-address
  }
  # store val
  circular-buffer:address:array:location <- get *chan, data:offset
  free:address:number <- get-address *chan, first-free:offset
  dest:address:location <- index-address *circular-buffer, *free
  *dest <- copy val
  # mark its slot as filled
  *free <- add *free, 1
  {
    # wrap free around to 0 if necessary
    len:number <- length *circular-buffer
    at-end?:boolean <- greater-or-equal *free, len
    break-unless at-end?
    *free <- copy 0
  }
  reply chan/same-as-ingredient:0
]

# result:location, chan <- read chan:address:channel
recipe read [
  local-scope
  chan:address:channel <- next-ingredient
  {
    # block if chan is empty
    empty?:boolean <- channel-empty? chan
    break-unless empty?
    free-address:address:number <- get-address *chan, first-free:offset
    wait-for-location *free-address
  }
  # read result
  full:address:number <- get-address *chan, first-full:offset
  circular-buffer:address:array:location <- get *chan, data:offset
  result:location <- index *circular-buffer, *full
  # mark its slot as empty
  *full <- add *full, 1
  {
    # wrap full around to 0 if necessary
    len:number <- length *circular-buffer
    at-end?:boolean <- greater-or-equal *full, len
    break-unless at-end?
    *full <- copy 0
  }
  reply result, chan/same-as-ingredient:0
]

recipe clear-channel [
  local-scope
  chan:address:channel <- next-ingredient
  {
    empty?:boolean <- channel-empty? chan
    break-if empty?
    _, chan <- read chan
  }
  reply chan/same-as-ingredient:0
]

scenario channel-initialization [
  run [
    1:address:channel <- new-channel 3/capacity
    2:number <- get *1:address:channel, first-full:offset
    3:number <- get *1:address:channel, first-free:offset
  ]
  memory-should-contain [
    2 <- 0  # first-full
    3 <- 0  # first-free
  ]
]

scenario channel-write-increments-free [
  run [
    1:address:channel <- new-channel 3/capacity
    1:address:channel <- write 1:address:channel, 34
    2:number <- get *1:address:channel, first-full:offset
    3:number <- get *1:address:channel, first-free:offset
  ]
  memory-should-contain [
    2 <- 0  # first-full
    3 <- 1  # first-free
  ]
]

scenario channel-read-increments-full [
  run [
    1:address:channel <- new-channel 3/capacity
    1:address:channel <- write 1:address:channel, 34
    _, 1:address:channel <- read 1:address:channel
    2:number <- get *1:address:channel, first-full:offset
    3:number <- get *1:address:channel, first-free:offset
  ]
  memory-should-contain [
    2 <- 1  # first-full
    3 <- 1  # first-free
  ]
]

scenario channel-wrap [
  run [
    # channel with just 1 slot
    1:address:channel <- new-channel 1/capacity
    # write and read a value
    1:address:channel <- write 1:address:channel, 34
    _, 1:address:channel <- read 1:address:channel
    # first-free will now be 1
    2:number <- get *1:address:channel, first-free:offset
    3:number <- get *1:address:channel, first-free:offset
    # write second value, verify that first-free wraps
    1:address:channel <- write 1:address:channel, 34
    4:number <- get *1:address:channel, first-free:offset
    # read second value, verify that first-full wraps
    _, 1:address:channel <- read 1:address:channel
    5:number <- get *1:address:channel, first-full:offset
  ]
  memory-should-contain [
    2 <- 1  # first-free after first write
    3 <- 1  # first-full after first read
    4 <- 0  # first-free after second write, wrapped
    5 <- 0  # first-full after second read, wrapped
  ]
]

## helpers

# An empty channel has first-empty and first-full both at the same value.
recipe channel-empty? [
  local-scope
  chan:address:channel <- next-ingredient
  # return chan.first-full == chan.first-free
  full:number <- get *chan, first-full:offset
  free:number <- get *chan, first-free:offset
  result:boolean <- equal full, free
  reply result
]

# A full channel has first-empty just before first-full, wasting one slot.
# (Other alternatives: https://en.wikipedia.org/wiki/Circular_buffer#Full_.2F_Empty_Buffer_Distinction)
recipe channel-full? [
  local-scope
  chan:address:channel <- next-ingredient
  # tmp = chan.first-free + 1
  tmp:number <- get *chan, first-free:offset
  tmp <- add tmp, 1
  {
    # if tmp == chan.capacity, tmp = 0
    len:number <- channel-capacity chan
    at-end?:boolean <- greater-or-equal tmp, len
    break-unless at-end?
    tmp <- copy 0
  }
  # return chan.first-full == tmp
  full:number <- get *chan, first-full:offset
  result:boolean <- equal full, tmp
  reply result
]

# result:number <- channel-capacity chan:address:channel
recipe channel-capacity [
  local-scope
  chan:address:channel <- next-ingredient
  q:address:array:location <- get *chan, data:offset
  result:number <- length *q
  reply result
]

scenario channel-new-empty-not-full [
  run [
    1:address:channel <- new-channel 3/capacity
    2:boolean <- channel-empty? 1:address:channel
    3:boolean <- channel-full? 1:address:channel
  ]
  memory-should-contain [
    2 <- 1  # empty?
    3 <- 0  # full?
  ]
]

scenario channel-write-not-empty [
  run [
    1:address:channel <- new-channel 3/capacity
    1:address:channel <- write 1:address:channel, 34
    2:boolean <- channel-empty? 1:address:channel
    3:boolean <- channel-full? 1:address:channel
  ]
  memory-should-contain [
    2 <- 0  # empty?
    3 <- 0  # full?
  ]
]

scenario channel-write-full [
  run [
    1:address:channel <- new-channel 1/capacity
    1:address:channel <- write 1:address:channel, 34
    2:boolean <- channel-empty? 1:address:channel
    3:boolean <- channel-full? 1:address:channel
  ]
  memory-should-contain [
    2 <- 0  # empty?
    3 <- 1  # full?
  ]
]

scenario channel-read-not-full [
  run [
    1:address:channel <- new-channel 1/capacity
    1:address:channel <- write 1:address:channel, 34
    _, 1:address:channel <- read 1:address:channel
    2:boolean <- channel-empty? 1:address:channel
    3:boolean <- channel-full? 1:address:channel
  ]
  memory-should-contain [
    2 <- 1  # empty?
    3 <- 0  # full?
  ]
]

# helper for channels of characters in particular
# out <- buffer-lines in:address:channel, out:address:channel
recipe buffer-lines [
  local-scope
  in:address:channel <- next-ingredient
  out:address:channel <- next-ingredient
  # repeat forever
  {
    line:address:buffer <- new-buffer, 30
    # read characters from 'in' until newline, copy into line
    {
      +next-character
      c:character, in <- read in
      # drop a character on backspace
      {
        # special-case: if it's a backspace
        backspace?:boolean <- equal c, 8
        break-unless backspace?
        # drop previous character
        {
          buffer-length:address:number <- get-address *line, length:offset
          buffer-empty?:boolean <- equal *buffer-length, 0
          break-if buffer-empty?
          *buffer-length <- subtract *buffer-length, 1
        }
        # and don't append this one
        loop +next-character:label
      }
      # append anything else
      line <- buffer-append line, c
      line-done?:boolean <- equal c, 10/newline
      break-if line-done?
      # stop buffering on eof (currently only generated by fake console)
      eof?:boolean <- equal c, 0/eof
      break-if eof?
      loop
    }
    # copy line into 'out'
    i:number <- copy 0
    line-contents:address:array:character <- get *line, data:offset
    max:number <- get *line, length:offset
    {
      done?:boolean <- greater-or-equal i, max
      break-if done?
      c:character <- index *line-contents, i
      out <- write out, c
      i <- add i, 1
      loop
    }
    loop
  }
  reply out/same-as-ingredient:1
]

scenario buffer-lines-blocks-until-newline [
  run [
    1:address:channel/stdin <- new-channel 10/capacity
    2:address:channel/buffered-stdin <- new-channel 10/capacity
    3:boolean <- channel-empty? 2:address:channel/buffered-stdin
    assert 3:boolean, [
F buffer-lines-blocks-until-newline: channel should be empty after init]
    # buffer stdin into buffered-stdin, try to read from buffered-stdin
    4:number/buffer-routine <- start-running buffer-lines:recipe, 1:address:channel/stdin, 2:address:channel/buffered-stdin
    wait-for-routine 4:number/buffer-routine
    5:boolean <- channel-empty? 2:address:channel/buffered-stdin
    assert 5:boolean, [
F buffer-lines-blocks-until-newline: channel should be empty after buffer-lines bring-up]
    # write 'a'
    1:address:channel <- write 1:address:channel, 97/a
    restart 4:number/buffer-routine
    wait-for-routine 4:number/buffer-routine
    6:boolean <- channel-empty? 2:address:channel/buffered-stdin
    assert 6:boolean, [
F buffer-lines-blocks-until-newline: channel should be empty after writing 'a']
    # write 'b'
    1:address:channel <- write 1:address:channel, 98/b
    restart 4:number/buffer-routine
    wait-for-routine 4:number/buffer-routine
    7:boolean <- channel-empty? 2:address:channel/buffered-stdin
    assert 7:boolean, [
F buffer-lines-blocks-until-newline: channel should be empty after writing 'b']
    # write newline
    1:address:channel <- write 1:address:channel, 10/newline
    restart 4:number/buffer-routine
    wait-for-routine 4:number/buffer-routine
    8:boolean <- channel-empty? 2:address:channel/buffered-stdin
    9:boolean/completed? <- not 8:boolean
    assert 9:boolean/completed?, [
F buffer-lines-blocks-until-newline: channel should contain data after writing newline]
    trace 1, [test], [reached end]
  ]
  trace-should-contain [
    test: reached end
  ]
]
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-11-17 18:37:07 +0000