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https://github.com/fish-shell/fish-shell.git
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cfc06203e7
--inherit-variable takes a variable name and snapshots its current value. When the function is executed, it will have a local variable with this value already defined. Printing the function source will include synthesized `set -l` lines for the values. This is primarily useful for functions that are created on the fly, such as in `psub`.
375 lines
10 KiB
C++
375 lines
10 KiB
C++
/** \file function.c
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Prototypes for functions for storing and retrieving function
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information. These functions also take care of autoloading
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functions in the $fish_function_path. Actual function evaluation
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is taken care of by the parser and to some degree the builtin
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handling library.
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*/
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#include "config.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <wchar.h>
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#include <unistd.h>
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#include <termios.h>
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#include <signal.h>
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#include <pthread.h>
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#include <errno.h>
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#include <map>
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#include <set>
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#include "wutil.h"
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#include "fallback.h"
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#include "util.h"
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#include "function.h"
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#include "proc.h"
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#include "parser.h"
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#include "common.h"
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#include "intern.h"
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#include "event.h"
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#include "reader.h"
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#include "parse_util.h"
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#include "parser_keywords.h"
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#include "env.h"
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#include "expand.h"
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/**
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Table containing all functions
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*/
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typedef std::map<wcstring, function_info_t> function_map_t;
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static function_map_t loaded_functions;
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/* Lock for functions */
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static pthread_mutex_t functions_lock;
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/* Autoloader for functions */
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class function_autoload_t : public autoload_t
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{
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public:
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function_autoload_t();
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virtual void command_removed(const wcstring &cmd);
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};
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static function_autoload_t function_autoloader;
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/** Constructor */
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function_autoload_t::function_autoload_t() : autoload_t(L"fish_function_path", NULL, 0)
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{
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}
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/** Callback when an autoloaded function is removed */
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void function_autoload_t::command_removed(const wcstring &cmd)
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{
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function_remove_ignore_autoload(cmd);
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}
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/**
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Kludgy flag set by the load function in order to tell function_add
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that the function being defined is autoloaded. There should be a
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better way to do this...
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*/
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static bool is_autoload = false;
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/**
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Make sure that if the specified function is a dynamically loaded
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function, it has been fully loaded.
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*/
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static int load(const wcstring &name)
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{
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ASSERT_IS_MAIN_THREAD();
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scoped_lock lock(functions_lock);
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bool was_autoload = is_autoload;
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int res;
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function_map_t::iterator iter = loaded_functions.find(name);
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if (iter != loaded_functions.end() && !iter->second.is_autoload)
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{
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/* We have a non-autoload version already */
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return 0;
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}
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is_autoload = true;
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res = function_autoloader.load(name, true);
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is_autoload = was_autoload;
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return res;
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}
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/**
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Insert a list of all dynamically loaded functions into the
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specified list.
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*/
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static void autoload_names(std::set<wcstring> &names, int get_hidden)
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{
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size_t i;
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const env_var_t path_var_wstr = env_get_string(L"fish_function_path");
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if (path_var_wstr.missing())
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return;
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const wchar_t *path_var = path_var_wstr.c_str();
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wcstring_list_t path_list;
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tokenize_variable_array(path_var, path_list);
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for (i=0; i<path_list.size(); i++)
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{
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const wcstring &ndir_str = path_list.at(i);
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const wchar_t *ndir = (wchar_t *)ndir_str.c_str();
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DIR *dir = wopendir(ndir);
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if (!dir)
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continue;
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wcstring name;
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while (wreaddir(dir, name))
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{
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const wchar_t *fn = name.c_str();
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const wchar_t *suffix;
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if (!get_hidden && fn[0] == L'_')
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continue;
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suffix = wcsrchr(fn, L'.');
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if (suffix && (wcscmp(suffix, L".fish") == 0))
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{
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wcstring name(fn, suffix - fn);
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names.insert(name);
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}
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}
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closedir(dir);
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}
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}
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void function_init()
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{
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/* PCA: This recursive lock was introduced early in my work. I would like to make this a non-recursive lock but I haven't fully investigated all the call paths (for autoloading functions, etc.) */
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pthread_mutexattr_t a;
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VOMIT_ON_FAILURE(pthread_mutexattr_init(&a));
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VOMIT_ON_FAILURE(pthread_mutexattr_settype(&a,PTHREAD_MUTEX_RECURSIVE));
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VOMIT_ON_FAILURE(pthread_mutex_init(&functions_lock, &a));
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VOMIT_ON_FAILURE(pthread_mutexattr_destroy(&a));
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}
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static std::map<wcstring,env_var_t> snapshot_vars(const wcstring_list_t &vars)
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{
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std::map<wcstring,env_var_t> result;
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for (wcstring_list_t::const_iterator it = vars.begin(), end = vars.end(); it != end; ++it)
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{
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result.insert(std::make_pair(*it, env_get_string(*it)));
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}
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return result;
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}
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function_info_t::function_info_t(const function_data_t &data, const wchar_t *filename, int def_offset, bool autoload) :
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definition(data.definition),
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description(data.description),
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definition_file(intern(filename)),
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definition_offset(def_offset),
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named_arguments(data.named_arguments),
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inherit_vars(snapshot_vars(data.inherit_vars)),
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is_autoload(autoload),
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shadows(data.shadows)
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{
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}
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function_info_t::function_info_t(const function_info_t &data, const wchar_t *filename, int def_offset, bool autoload) :
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definition(data.definition),
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description(data.description),
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definition_file(intern(filename)),
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definition_offset(def_offset),
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named_arguments(data.named_arguments),
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inherit_vars(data.inherit_vars),
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is_autoload(autoload),
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shadows(data.shadows)
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{
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}
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void function_add(const function_data_t &data, const parser_t &parser, int definition_line_offset)
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{
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ASSERT_IS_MAIN_THREAD();
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CHECK(! data.name.empty(),);
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CHECK(data.definition,);
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scoped_lock lock(functions_lock);
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/* Remove the old function */
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function_remove(data.name);
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/* Create and store a new function */
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const wchar_t *filename = reader_current_filename();
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const function_map_t::value_type new_pair(data.name, function_info_t(data, filename, definition_line_offset, is_autoload));
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loaded_functions.insert(new_pair);
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/* Add event handlers */
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for (std::vector<event_t>::const_iterator iter = data.events.begin(); iter != data.events.end(); ++iter)
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{
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event_add_handler(*iter);
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}
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}
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int function_exists(const wcstring &cmd)
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{
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if (parser_keywords_is_reserved(cmd))
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return 0;
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scoped_lock lock(functions_lock);
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load(cmd);
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return loaded_functions.find(cmd) != loaded_functions.end();
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}
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int function_exists_no_autoload(const wcstring &cmd, const env_vars_snapshot_t &vars)
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{
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if (parser_keywords_is_reserved(cmd))
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return 0;
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scoped_lock lock(functions_lock);
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return loaded_functions.find(cmd) != loaded_functions.end() || function_autoloader.can_load(cmd, vars);
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}
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bool function_remove_ignore_autoload(const wcstring &name)
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{
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scoped_lock lock(functions_lock);
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bool erased = (loaded_functions.erase(name) > 0);
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if (erased)
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{
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event_t ev(EVENT_ANY);
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ev.function_name=name;
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event_remove(ev);
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}
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return erased;
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}
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void function_remove(const wcstring &name)
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{
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if (function_remove_ignore_autoload(name))
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function_autoloader.unload(name);
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}
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static const function_info_t *function_get(const wcstring &name)
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{
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// The caller must lock the functions_lock before calling this; however our mutex is currently recursive, so trylock will never fail
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// We need a way to correctly check if a lock is locked (or better yet, make our lock non-recursive)
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//ASSERT_IS_LOCKED(functions_lock);
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function_map_t::iterator iter = loaded_functions.find(name);
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if (iter == loaded_functions.end())
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{
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return NULL;
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}
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else
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{
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return &iter->second;
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}
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}
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bool function_get_definition(const wcstring &name, wcstring *out_definition)
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{
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scoped_lock lock(functions_lock);
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const function_info_t *func = function_get(name);
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if (func && out_definition)
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{
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out_definition->assign(func->definition);
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}
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return func != NULL;
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}
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wcstring_list_t function_get_named_arguments(const wcstring &name)
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{
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scoped_lock lock(functions_lock);
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const function_info_t *func = function_get(name);
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return func ? func->named_arguments : wcstring_list_t();
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}
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std::map<wcstring,env_var_t> function_get_inherit_vars(const wcstring &name)
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{
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scoped_lock lock(functions_lock);
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const function_info_t *func = function_get(name);
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return func ? func->inherit_vars : std::map<wcstring,env_var_t>();
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}
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int function_get_shadows(const wcstring &name)
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{
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scoped_lock lock(functions_lock);
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const function_info_t *func = function_get(name);
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return func ? func->shadows : false;
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}
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bool function_get_desc(const wcstring &name, wcstring *out_desc)
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{
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/* Empty length string goes to NULL */
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scoped_lock lock(functions_lock);
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const function_info_t *func = function_get(name);
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if (out_desc && func && ! func->description.empty())
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{
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out_desc->assign(_(func->description.c_str()));
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return true;
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}
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else
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{
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return false;
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}
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}
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void function_set_desc(const wcstring &name, const wcstring &desc)
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{
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load(name);
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scoped_lock lock(functions_lock);
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function_map_t::iterator iter = loaded_functions.find(name);
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if (iter != loaded_functions.end())
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{
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iter->second.description = desc;
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}
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}
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bool function_copy(const wcstring &name, const wcstring &new_name)
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{
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bool result = false;
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scoped_lock lock(functions_lock);
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function_map_t::const_iterator iter = loaded_functions.find(name);
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if (iter != loaded_functions.end())
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{
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// This new instance of the function shouldn't be tied to the definition file of the original, so pass NULL filename, etc.
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const function_map_t::value_type new_pair(new_name, function_info_t(iter->second, NULL, 0, false));
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loaded_functions.insert(new_pair);
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result = true;
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}
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return result;
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}
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wcstring_list_t function_get_names(int get_hidden)
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{
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std::set<wcstring> names;
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scoped_lock lock(functions_lock);
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autoload_names(names, get_hidden);
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function_map_t::const_iterator iter;
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for (iter = loaded_functions.begin(); iter != loaded_functions.end(); ++iter)
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{
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const wcstring &name = iter->first;
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/* Maybe skip hidden */
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if (! get_hidden)
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{
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if (name.empty() || name.at(0) == L'_') continue;
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}
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names.insert(name);
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}
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return wcstring_list_t(names.begin(), names.end());
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}
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const wchar_t *function_get_definition_file(const wcstring &name)
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{
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scoped_lock lock(functions_lock);
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const function_info_t *func = function_get(name);
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return func ? func->definition_file : NULL;
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}
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int function_get_definition_offset(const wcstring &name)
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{
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scoped_lock lock(functions_lock);
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const function_info_t *func = function_get(name);
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return func ? func->definition_offset : -1;
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}
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