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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  If there is no package or it is out of date,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.
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-11-17 14:44:03 +0000
itle='author Kartik K. Agaram <vc@akkartik.com> 2015-04-17 18:32:39 -0700 committer Kartik K. Agaram <vc@akkartik.com> 2015-04-17 18:32:39 -0700 1085 - to access variants of sum types use 'maybe-convert'' href='/akkartik/mu/commit/cpp/034exclusive_container?h=main&id=dd994cdad0eb4aa5b890ec62138d573fdf3c3f10'>dd994cda ^ 
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//: Exclusive containers contain exactly one of a fixed number of 'variants'
//: of different types.
//:
//: They also implicitly contain a tag describing precisely which variant is
//: currently stored in them.

:(before "End Mu Types Initialization")
//: We'll use this container as a running example, with two number elements.
{
type_ordinal tmp = Type_ordinal["number-or-point"] = Next_type_ordinal++;
Type[tmp].size = 2;
Type[tmp].kind = exclusive_container;
Type[tmp].name = "number-or-point";
vector<type_ordinal> t1;
t1.push_back(number);
Type[tmp].elements.push_back(t1);
vector<type_ordinal> t2;
t2.push_back(point);
Type[tmp].elements.push_back(t2);
Type[tmp].element_names.push_back("i");
Type[tmp].element_names.push_back("p");
}

//: Tests in this layer often explicitly setup memory before reading it as an
//: array. Don't do this in general. I'm tagging exceptions with /raw to
//: avoid warnings.
:(scenario copy_exclusive_container)
# Copying exclusive containers copies all their contents and an extra location for the tag.
recipe main [
  1:number <- copy 1  # 'point' variant
  2:number <- copy 34
  3:number <- copy 35
  4:number-or-point <- copy 1:number-or-point/raw  # unsafe
]
+mem: storing 1 in location 4
+mem: storing 34 in location 5
+mem: storing 35 in location 6

:(before "End size_of(types) Cases")
if (t.kind == exclusive_container) {
  // size of an exclusive container is the size of its largest variant
  // (So like containers, it can't contain arrays.)
  long long int result = 0;
  for (long long int i = 0; i < t.size; ++i) {
    long long int tmp = size_of(t.elements.at(i));
    if (tmp > result) result = tmp;
  }
  // ...+1 for its tag.
  return result+1;
}

//:: To access variants of an exclusive container, use 'maybe-convert'.
//: It always returns an address (so that you can modify it) or null (to
//: signal that the conversion failed (because the container contains a
//: different variant).

//: 'maybe-convert' requires a literal in ingredient 1. We'll use a synonym
//: called 'variant'.
:(before "End Mu Types Initialization")
Type_ordinal["variant"] = 0;

:(scenario maybe_convert)
recipe main [
  12:number <- copy 1
  13:number <- copy 35
  14:number <- copy 36
  20:address:point <- maybe-convert 12:number-or-point/raw, 1:variant  # unsafe
]
+mem: storing 13 in location 20

:(scenario maybe_convert_fail)
recipe main [
  12:number <- copy 1
  13:number <- copy 35
  14:number <- copy 36
  20:address:point <- maybe-convert 12:number-or-point/raw, 0:variant  # unsafe
]
+mem: storing 0 in location 20

:(before "End Primitive Recipe Declarations")
MAYBE_CONVERT,
:(before "End Primitive Recipe Numbers")
Recipe_ordinal["maybe-convert"] = MAYBE_CONVERT;
:(before "End Primitive Recipe Implementations")
case MAYBE_CONVERT: {
  if (SIZE(ingredients) != 2) {
    raise << current_recipe_name() << ": 'maybe-convert' expects exactly 2 ingredients in '" << current_instruction().to_string() << "'\n" << end();
    break;
  }
  reagent base = canonize(current_instruction().ingredients.at(0));
  long long int base_address = base.value;
  if (base_address == 0) {
    raise << current_recipe_name() << ": tried to access location 0 in '" << current_instruction().to_string() << "'\n" << end();
    break;
  }
  type_ordinal base_type = base.types.at(0);
  if (Type[base_type].kind != exclusive_container) {
    raise << current_recipe_name () << ": first ingredient of 'maybe-convert' should be an exclusive-container, but got " << base.original_string << '\n' << end();
    break;
  }
  if (!is_literal(current_instruction().ingredients.at(1))) {
    raise << current_recipe_name() << ": second ingredient of 'maybe-convert' should have type 'variant', but got " << current_instruction().ingredients.at(1).original_string << '\n' << end();
    break;
  }
  long long int tag = current_instruction().ingredients.at(1).value;
  long long int result;
  if (tag == static_cast<long long int>(Memory[base_address])) {
    result = base_address+1;
  }
  else {
    result = 0;
  }
  products.resize(1);
  products.at(0).push_back(result);
  break;
}

//:: Allow exclusive containers to be defined in mu code.

:(scenario exclusive_container)
exclusive-container foo [
  x:number
  y:number
]
+parse: reading exclusive-container foo
+parse:   element name: x
+parse:   type: 1
+parse:   element name: y
+parse:   type: 1

:(before "End Command Handlers")
else if (command == "exclusive-container") {
  insert_container(command, exclusive_container, in);
}

//:: To construct exclusive containers out of variant types, use 'merge'.
:(scenario lift_to_exclusive_container)
exclusive-container foo [
  x:number
  y:number
]

recipe main [
  1:number <- copy 34
  2:foo <- merge 0/x, 1:number
  4:foo <- merge 1/x, 1:number
]
+mem: storing 0 in location 2
+mem: storing 34 in location 3
+mem: storing 1 in location 4
+mem: storing 34 in location 5
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-11-17 14:43:59 +0000