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
|
// The classes responsible for autoloading functions and completions.
#ifndef FISH_AUTOLOAD_H
#define FISH_AUTOLOAD_H
#include <pthread.h>
#include <stdbool.h>
#include <stddef.h>
#include <time.h>
#include <set>
#include "common.h"
#include "lru.h"
/// Record of an attempt to access a file.
struct file_access_attempt_t {
/// Modification time of the file
time_t mod_time;
/// When we last checked the file
time_t last_checked;
/// Whether or not we believe we can access this file
bool accessible;
/// The access attempt is stale
bool stale;
/// If we cannot access the file, the error code encountered.
int error;
};
file_access_attempt_t access_file(const wcstring &path, int mode);
struct autoload_function_t : public lru_node_t {
explicit autoload_function_t(const wcstring &key)
: lru_node_t(key),
access(),
is_loaded(false),
is_placeholder(false),
is_internalized(false) {}
/// The last access attempt recorded
file_access_attempt_t access;
/// Have we actually loaded this function?
bool is_loaded;
/// Whether we are a placeholder that stands in for "no such function". If this is true, then
/// is_loaded must be false.
bool is_placeholder;
/// Whether this function came from a builtin "internalized" script.
bool is_internalized;
};
struct builtin_script_t {
const wchar_t *name;
const char *def;
};
class env_vars_snapshot_t;
/// Class representing a path from which we can autoload and the autoloaded contents.
class autoload_t : private lru_cache_t<autoload_function_t> {
private:
/// Lock for thread safety.
pthread_mutex_t lock;
/// The environment variable name.
const wcstring env_var_name;
/// Builtin script array.
const struct builtin_script_t *const builtin_scripts;
/// Builtin script count.
const size_t builtin_script_count;
/// The path from which we most recently autoloaded.
wcstring last_path;
/// the most reecently autoloaded path, tokenized (split on separators).
wcstring_list_t last_path_tokenized;
/// A table containing all the files that are currently being loaded.
/// This is here to help prevent recursion.
std::set<wcstring> is_loading_set;
void remove_all_functions(void) { this->evict_all_nodes(); }
bool locate_file_and_maybe_load_it(const wcstring &cmd, bool really_load, bool reload,
const wcstring_list_t &path_list);
virtual void node_was_evicted(autoload_function_t *node);
autoload_function_t *get_autoloaded_function_with_creation(const wcstring &cmd,
bool allow_eviction);
protected:
/// Overridable callback for when a command is removed.
virtual void command_removed(const wcstring &cmd) {}
public:
/// Create an autoload_t for the given environment variable name.
autoload_t(const wcstring &env_var_name_var, const builtin_script_t *scripts,
size_t script_count);
virtual ~autoload_t();
/// Autoload the specified file, if it exists in the specified path. Do not load it multiple
/// times unless its timestamp changes or parse_util_unload is called.
/// Autoloading one file may unload another.
/// @param cmd the filename to search for. The suffix '.fish' is always added to this name
/// @param reload wheter to recheck file timestamps on already loaded files
int load(const wcstring &cmd, bool reload);
/// Check whether we have tried loading the given command. Does not do any I/O.
bool has_tried_loading(const wcstring &cmd);
/// Tell the autoloader that the specified file, in the specified path, is no longer loaded.
/// Returns non-zero if the file was removed, zero if the file had not yet been loaded
int unload(const wcstring &cmd);
/// Check whether the given command could be loaded, but do not load it.
bool can_load(const wcstring &cmd, const env_vars_snapshot_t &vars);
};
#endif
|
