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/** \file function.c
Prototypes for functions for storing and retrieving function
information. These functions also take care of autoloading
functions in the $fish_function_path. Actual function evaluation
is taken care of by the parser and to some degree the builtin
handling library.
*/
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <wchar.h>
#include <unistd.h>
#include <termios.h>
#include <signal.h>
#include "wutil.h"
#include "fallback.h"
#include "util.h"
#include "function.h"
#include "proc.h"
#include "parser.h"
#include "common.h"
#include "intern.h"
#include "event.h"
#include "reader.h"
#include "parse_util.h"
#include "parser_keywords.h"
#include "env.h"
#include "expand.h"
#include "halloc.h"
#include "halloc_util.h"
/**
Struct describing a function
*/
typedef struct
{
/** Function definition */
wchar_t *definition;
/** Function description */
wchar_t *description;
/**
File where this function was defined
*/
const wchar_t *definition_file;
/**
Line where definition started
*/
int definition_offset;
/**
List of all named arguments for this function
*/
array_list_t *named_arguments;
/**
Flag for specifying that this function was automatically loaded
*/
int is_autoload;
/**
Set to non-zero if invoking this function shadows the variables
of the underlying function.
*/
int shadows;
}
function_internal_data_t;
/**
Table containing all functions
*/
static hash_table_t function;
/**
Kludgy flag set by the load function in order to tell function_add
that the function being defined is autoloaded. There should be a
better way to do this...
*/
static int is_autoload = 0;
/**
Make sure that if the specified function is a dynamically loaded
function, it has been fully loaded.
*/
static int load( const wchar_t *name )
{
int was_autoload = is_autoload;
int res;
function_internal_data_t *data;
data = (function_internal_data_t *)hash_get( &function, name );
if( data && !data->is_autoload )
return 0;
is_autoload = 1;
res = parse_util_load( name,
L"fish_function_path",
&function_remove,
1 );
is_autoload = was_autoload;
return res;
}
/**
Insert a list of all dynamically loaded functions into the
specified list.
*/
static void autoload_names( array_list_t *out, int get_hidden )
{
int i;
array_list_t path_list;
const wchar_t *path_var = env_get( L"fish_function_path" );
if( ! path_var )
return;
al_init( &path_list );
tokenize_variable_array( path_var, &path_list );
for( i=0; i<al_get_count( &path_list ); i++ )
{
wchar_t *ndir = (wchar_t *)al_get( &path_list, i );
DIR *dir = wopendir( ndir );
if( !dir )
continue;
struct wdirent *next;
while( (next=wreaddir(dir))!=0 )
{
wchar_t *fn = next->d_name;
wchar_t *suffix;
if( !get_hidden && fn[0] == L'_' )
continue;
suffix = wcsrchr( fn, L'.' );
if( suffix && (wcscmp( suffix, L".fish" ) == 0 ) )
{
const wchar_t *dup;
*suffix = 0;
dup = intern( fn );
if( !dup )
DIE_MEM();
al_push( out, dup );
}
}
closedir(dir);
}
al_foreach( &path_list, &free );
al_destroy( &path_list );
}
void function_init()
{
hash_init( &function,
&hash_wcs_func,
&hash_wcs_cmp );
}
/**
Clear specified value, but not key
*/
static void clear_entry( void *key, void *value )
{
halloc_free( value );
}
void function_destroy()
{
hash_foreach( &function, &clear_entry );
hash_destroy( &function );
}
void function_add( function_data_t *data )
{
int i;
wchar_t *cmd_end;
function_internal_data_t *d;
CHECK( data->name, );
CHECK( data->definition, );
function_remove( data->name );
d = halloc( 0, sizeof( function_internal_data_t ) );
d->definition_offset = parse_util_lineno( parser_get_buffer(), current_block->tok_pos )-1;
d->definition = halloc_wcsdup( d, data->definition );
if( data->named_arguments )
{
d->named_arguments = al_halloc( d );
for( i=0; i<al_get_count( data->named_arguments ); i++ )
{
al_push( d->named_arguments, halloc_wcsdup( d, (wchar_t *)al_get( data->named_arguments, i ) ) );
}
}
cmd_end = d->definition + wcslen(d->definition)-1;
d->description = data->description?halloc_wcsdup( d, data->description ):0;
d->definition_file = intern(reader_current_filename());
d->is_autoload = is_autoload;
d->shadows = data->shadows;
hash_put( &function, intern(data->name), d );
for( i=0; i<al_get_count( data->events ); i++ )
{
event_add_handler( (event_t *)al_get( data->events, i ) );
}
}
int function_exists( const wchar_t *cmd )
{
CHECK( cmd, 0 );
if( parser_keywords_is_reserved(cmd) )
return 0;
load( cmd );
return (hash_get(&function, cmd) != 0 );
}
void function_remove( const wchar_t *name )
{
void *key;
void *dv;
function_internal_data_t *d;
event_t ev;
CHECK( name, );
hash_remove( &function,
name,
&key,
&dv );
d=(function_internal_data_t *)dv;
if( !key )
return;
ev.type=EVENT_ANY;
ev.function_name=name;
event_remove( &ev );
halloc_free( d );
/*
Notify the autoloader that the specified function is erased, but
only if this call to fish_remove is not made by the autoloader
itself.
*/
if( !is_autoload )
{
parse_util_unload( name, L"fish_function_path", 0 );
}
}
const wchar_t *function_get_definition( const wchar_t *name )
{
function_internal_data_t *data;
CHECK( name, 0 );
load( name );
data = (function_internal_data_t *)hash_get( &function, name );
if( data == 0 )
return 0;
return data->definition;
}
array_list_t *function_get_named_arguments( const wchar_t *name )
{
function_internal_data_t *data;
CHECK( name, 0 );
load( name );
data = (function_internal_data_t *)hash_get( &function, name );
if( data == 0 )
return 0;
return data->named_arguments;
}
int function_get_shadows( const wchar_t *name )
{
function_internal_data_t *data;
CHECK( name, 0 );
load( name );
data = (function_internal_data_t *)hash_get( &function, name );
if( data == 0 )
return 0;
return data->shadows;
}
const wchar_t *function_get_desc( const wchar_t *name )
{
function_internal_data_t *data;
CHECK( name, 0 );
load( name );
data = (function_internal_data_t *)hash_get( &function, name );
if( data == 0 )
return 0;
return _(data->description);
}
void function_set_desc( const wchar_t *name, const wchar_t *desc )
{
function_internal_data_t *data;
CHECK( name, );
CHECK( desc, );
load( name );
data = (function_internal_data_t *)hash_get( &function, name );
if( data == 0 )
return;
data->description = halloc_wcsdup( data, desc );
}
/**
Search arraylist of strings for specified string
*/
static int al_contains_str( array_list_t *list, const wchar_t * str )
{
int i;
CHECK( list, 0 );
CHECK( str, 0 );
for( i=0; i<al_get_count( list ); i++ )
{
if( wcscmp( al_get( list, i ), str) == 0 )
{
return 1;
}
}
return 0;
}
/**
Helper function for removing hidden functions
*/
static void get_names_internal( void *key,
void *val,
void *aux )
{
wchar_t *name = (wchar_t *)key;
if( name[0] != L'_' && !al_contains_str( (array_list_t *)aux, name ) )
{
al_push( (array_list_t *)aux, name );
}
}
/**
Helper function for removing hidden functions
*/
static void get_names_internal_all( void *key,
void *val,
void *aux )
{
wchar_t *name = (wchar_t *)key;
if( !al_contains_str( (array_list_t *)aux, name ) )
{
al_push( (array_list_t *)aux, name );
}
}
void function_get_names( array_list_t *list, int get_hidden )
{
CHECK( list, );
autoload_names( list, get_hidden );
if( get_hidden )
{
hash_foreach2( &function, &get_names_internal_all, list );
}
else
{
hash_foreach2( &function, &get_names_internal, list );
}
}
const wchar_t *function_get_definition_file( const wchar_t *name )
{
function_internal_data_t *data;
CHECK( name, 0 );
data = (function_internal_data_t *)hash_get( &function, name );
if( data == 0 )
return 0;
return data->definition_file;
}
int function_get_definition_offset( const wchar_t *name )
{
function_internal_data_t *data;
CHECK( name, -1 );
data = (function_internal_data_t *)hash_get( &function, name );
if( data == 0 )
return -1;
return data->definition_offset;
}
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