1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
#pragma once
#include "args.hh"
namespace nix {
struct Value;
class EvalState;
/* A command is an argument parser that can be executed by calling its
run() method. */
struct Command : virtual Args
{
virtual std::string name() = 0;
virtual void prepare() { };
virtual void run() = 0;
struct Example
{
std::string description;
std::string command;
};
typedef std::list<Example> Examples;
virtual Examples examples() { return Examples(); }
void printHelp(const string & programName, std::ostream & out) override;
};
class Store;
/* A command that require a Nix store. */
struct StoreCommand : virtual Command
{
std::string storeUri;
StoreCommand();
void run() override;
ref<Store> getStore();
virtual ref<Store> createStore();
virtual void run(ref<Store>) = 0;
private:
std::shared_ptr<Store> _store;
};
struct Installable
{
virtual std::string what() = 0;
virtual PathSet toBuildable()
{
throw Error("argument ‘%s’ cannot be built", what());
}
virtual Value * toValue(EvalState & state)
{
throw Error("argument ‘%s’ cannot be evaluated", what());
}
};
/* A command that operates on a list of "installables", which can be
store paths, attribute paths, Nix expressions, etc. */
struct InstallablesCommand : virtual Args, StoreCommand
{
std::vector<std::shared_ptr<Installable>> installables;
Path file;
InstallablesCommand()
{
mkFlag('f', "file", "file", "evaluate FILE rather than the default", &file);
expectArgs("installables", &_installables);
}
/* Return a value representing the Nix expression from which we
are installing. This is either the file specified by ‘--file’,
or an attribute set constructed from $NIX_PATH, e.g. ‘{ nixpkgs
= import ...; bla = import ...; }’. */
Value * getSourceExpr(EvalState & state);
std::vector<std::shared_ptr<Installable>> parseInstallables(ref<Store> store, Strings installables);
PathSet buildInstallables(ref<Store> store, bool dryRun);
ref<EvalState> getEvalState();
void prepare() override;
private:
Strings _installables;
std::shared_ptr<EvalState> evalState;
Value * vSourceExpr = 0;
};
/* A command that operates on zero or more store paths. */
struct StorePathsCommand : public InstallablesCommand
{
private:
bool recursive = false;
bool all = false;
public:
StorePathsCommand();
using StoreCommand::run;
virtual void run(ref<Store> store, Paths storePaths) = 0;
void run(ref<Store> store) override;
};
typedef std::map<std::string, ref<Command>> Commands;
/* An argument parser that supports multiple subcommands,
i.e. ‘<command> <subcommand>’. */
class MultiCommand : virtual Args
{
public:
Commands commands;
std::shared_ptr<Command> command;
MultiCommand(const Commands & commands);
void printHelp(const string & programName, std::ostream & out) override;
bool processFlag(Strings::iterator & pos, Strings::iterator end) override;
bool processArgs(const Strings & args, bool finish) override;
};
/* A helper class for registering commands globally. */
struct RegisterCommand
{
static Commands * commands;
RegisterCommand(ref<Command> command)
{
if (!commands) commands = new Commands;
commands->emplace(command->name(), command);
}
};
}
|
