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elinks/src/scripting/guile/hooks.c

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/* Guile scripting hooks */
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <libguile.h>
#include "elinks.h"
#include "cache/cache.h"
#include "main/event.h"
#include "protocol/uri.h"
#include "scripting/guile/hooks.h"
#include "session/session.h"
#include "util/string.h"
static SCM
internal_module(void)
{
/* XXX: should use internal_module from core.c instead of referring to
* the module by name, once I figure out how... --pw */
return scm_c_resolve_module("elinks internal");
}
/* We need to catch and handle errors because, otherwise, Guile will kill us.
* Unfortunately, I do not know Guile, but this seems to work... -- Miciah */
static SCM
error_handler(void *data, SCM tag, SCM throw_args)
{
return SCM_BOOL_F;
}
static SCM
get_guile_hook_do(void *data)
{
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char *hook = (char *)data;
return scm_c_module_lookup(internal_module(), hook);
}
static SCM
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get_guile_hook(const char *hook)
{
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return scm_internal_catch(SCM_BOOL_T, get_guile_hook_do, (void *)hook,
error_handler, NULL);
}
/* The events that will trigger the functions below and what they are expected
* to do is explained in doc/events.txt */
static enum evhook_status
script_hook_goto_url(va_list ap, void *data)
{
char **url = va_arg(ap, char **);
struct session *ses = va_arg(ap, struct session *);
SCM proc;
SCM x;
evhook_use_params(url && ses);
if (*url == NULL || !*url[0]) return EVENT_HOOK_STATUS_NEXT;
proc = get_guile_hook("%goto-url-hook");
if (scm_is_false(proc)) return EVENT_HOOK_STATUS_NEXT;
x = scm_call_1(SCM_VARIABLE_REF(proc), scm_from_locale_string(*url));
if (scm_is_string(x)) {
char *new_url;
new_url = stracpy((char *)scm_to_locale_string(x));
if (new_url) {
mem_free_set(url, new_url);
}
} else {
(*url)[0] = 0;
}
return EVENT_HOOK_STATUS_NEXT;
}
static enum evhook_status
script_hook_follow_url(va_list ap, void *data)
{
char **url = va_arg(ap, char **);
struct session *ses = va_arg(ap, struct session *);
SCM proc;
SCM x;
evhook_use_params(url && ses);
if (*url == NULL || !*url[0]) return EVENT_HOOK_STATUS_NEXT;
proc = get_guile_hook("%follow-url-hook");
if (scm_is_false(proc)) return EVENT_HOOK_STATUS_NEXT;
x = scm_call_1(SCM_VARIABLE_REF(proc), scm_from_locale_string(*url));
if (scm_is_string(x)) {
char *new_url;
new_url = stracpy((char *)scm_to_locale_string(x));
if (new_url) {
mem_free_set(url, new_url);
}
} else {
(*url)[0] = 0;
}
return EVENT_HOOK_STATUS_NEXT;
}
static enum evhook_status
script_hook_pre_format_html(va_list ap, void *data)
{
struct session *ses = va_arg(ap, struct session *);
struct cache_entry *cached = va_arg(ap, struct cache_entry *);
struct fragment *fragment = get_cache_fragment(cached);
char *url = struri(cached->uri), *frag;
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size_t len;
SCM proc;
SCM x;
evhook_use_params(ses && cached);
if (!cached->length || !*fragment->data) return EVENT_HOOK_STATUS_NEXT;
proc = get_guile_hook("%pre-format-html-hook");
if (scm_is_false(proc)) return EVENT_HOOK_STATUS_NEXT;
x = scm_call_2(SCM_VARIABLE_REF(proc), scm_from_locale_string(url),
scm_from_locale_stringn(fragment->data, fragment->length));
if (!scm_is_string(x)) return EVENT_HOOK_STATUS_NEXT;
frag = (char *)scm_to_locale_stringn(x, &len);
add_fragment(cached, 0, frag, len);
normalize_cache_entry(cached, len);
return EVENT_HOOK_STATUS_NEXT;
}
/* The Guile function can return:
* - "PROXY:PORT" to use the specified proxy
* - "" to not use any proxy
* - nil to use the default proxies */
static enum evhook_status
script_hook_get_proxy(va_list ap, void *data)
{
char **retval = va_arg(ap, char **);
char *url = va_arg(ap, char *);
SCM proc = get_guile_hook("%get-proxy-hook");
SCM x;
if (scm_is_false(proc)) return EVENT_HOOK_STATUS_NEXT;
x = scm_call_1(SCM_VARIABLE_REF(proc), scm_from_locale_string(url));
evhook_use_params(retval && url);
if (scm_is_string(x)) {
mem_free_set(retval, stracpy(scm_to_locale_string(x)));
} else if (scm_is_null(x)) {
mem_free_set(retval, NULL);
}
return EVENT_HOOK_STATUS_NEXT;
}
static enum evhook_status
script_hook_quit(va_list ap, void *data)
{
SCM proc = get_guile_hook("%quit-hook");
if (scm_is_false(proc)) return EVENT_HOOK_STATUS_NEXT;
scm_call_0(SCM_VARIABLE_REF(proc));
return EVENT_HOOK_STATUS_NEXT;
}
struct event_hook_info guile_scripting_hooks[] = {
{ "goto-url", 0, script_hook_goto_url, {NULL} },
{ "follow-url", 0, script_hook_follow_url, {NULL} },
{ "pre-format-html", 0, script_hook_pre_format_html, {NULL} },
{ "get-proxy", 0, script_hook_get_proxy, {NULL} },
{ "quit", 0, script_hook_quit, {NULL} },
NULL_EVENT_HOOK_INFO,
};