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https://github.com/fish-shell/fish-shell
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103 lines
4.1 KiB
C++
103 lines
4.1 KiB
C++
// The classes responsible for autoloading functions and completions.
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#ifndef FISH_AUTOLOAD_H
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#define FISH_AUTOLOAD_H
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#include "config.h" // IWYU pragma: keep
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#include "common.h"
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#include "env.h"
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#include "wutil.h"
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#include <cassert>
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#include <memory>
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#include <unordered_map>
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#include <unordered_set>
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class autoload_file_cache_t;
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class environment_t;
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class parser_t;
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struct autoload_tester_t;
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/// autoload_t is a class that knows how to autoload .fish files from a list of directories. This
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/// is used by autoloading functions and completions. It maintains a file cache, which is
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/// responsible for potentially cached accesses of files, and then a list of files that have
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/// actually been autoloaded. A client may request a file to autoload given a command name, and may
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/// be returned a path which it is expected to source.
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/// autoload_t does not have any internal locks; it is the responsibility of the caller to lock
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/// it.
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class autoload_t {
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/// The environment variable whose paths we observe.
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const wcstring env_var_name_;
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/// A map from command to the files we have autoloaded.
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std::unordered_map<wcstring, file_id_t> autoloaded_files_;
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/// The list of commands that we are currently autoloading.
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std::unordered_set<wcstring> current_autoloading_;
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/// The autoload cache.
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/// This is a unique_ptr because want to change it if the value of our environment variable
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/// changes. This is never null (but it may be a cache with no paths).
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std::unique_ptr<autoload_file_cache_t> cache_;
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/// Invalidate any underlying cache.
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/// This is exposed for testing.
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void invalidate_cache();
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/// Like resolve_autoload(), but accepts the paths directly.
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/// This is exposed for testing.
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maybe_t<wcstring> resolve_command(const wcstring &cmd, const wcstring_list_t &paths);
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friend autoload_tester_t;
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public:
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/// Construct an autoloader that loads from the paths given by \p env_var_name.
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explicit autoload_t(wcstring env_var_name);
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autoload_t(autoload_t &&);
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~autoload_t();
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/// Given a command, get a path to autoload.
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/// For example, if the environment variable is 'fish_function_path' and the command is 'foo',
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/// this will look for a file 'foo.fish' in one of the directories given by fish_function_path.
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/// If there is no such file, OR if the file has been previously resolved and is now unchanged,
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/// this will return none. But if the file is either new or changed, this will return the path.
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/// After returning a path, the command is marked in-progress until the caller calls
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/// mark_autoload_finished() with the same command. Note this does not actually execute any
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/// code; it is the caller's responsibility to load the file.
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maybe_t<wcstring> resolve_command(const wcstring &cmd, const environment_t &env);
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/// Helper to actually perform an autoload.
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/// This is a static function because it executes fish script, and so must be called without
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/// holding any particular locks.
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static void perform_autoload(const wcstring &path, parser_t &parser);
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/// Mark that a command previously returned from path_to_autoload is finished autoloading.
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void mark_autoload_finished(const wcstring &cmd) {
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size_t amt = current_autoloading_.erase(cmd);
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assert(amt > 0 && "cmd was not being autoloaded");
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(void)amt;
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}
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/// \return whether a command is currently being autoloaded.
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bool autoload_in_progress(const wcstring &cmd) const {
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return current_autoloading_.count(cmd) > 0;
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}
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/// \return whether a command could potentially be autoloaded.
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/// This does not actually mark the command as being autoloaded.
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bool can_autoload(const wcstring &cmd);
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/// \return the names of all commands that have been autoloaded. Note this includes "in-flight"
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/// commands.
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wcstring_list_t get_autoloaded_commands() const;
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/// Mark that all autoloaded files have been forgotten.
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/// Future calls to path_to_autoload() will return previously-returned paths.
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void clear() {
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// Note there is no reason to invalidate the cache here.
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autoloaded_files_.clear();
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}
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};
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#endif
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