From: john at keeping.me.uk (John Keeping)
Subject: [PATCH 06/12] filter: add preliminary lua support
Date: Mon, 13 Jan 2014 08:55:31 +0000 [thread overview]
Message-ID: <20140113085531.GY7608@serenity.lan> (raw)
In-Reply-To: <1389586279-23724-7-git-send-email-Jason@zx2c4.com>
On Mon, Jan 13, 2014 at 05:11:13AM +0100, Jason A. Donenfeld wrote:
[snip]
> +static int html_lua_filter(lua_State *lua_state)
> +{
> + size_t len;
> + const char *str;
> +
> + str = lua_tostring(lua_state, 1);
> + if (!str)
> + return 0;
> + len = strlen(str);
> + libc_write(STDOUT_FILENO, str, len);
> + return 0;
> +}
> +
> +static void cleanup_lua_filter(struct cgit_filter *base)
> +{
> + struct lua_filter *filter = (struct lua_filter *) base;
> +
> + if (!filter->lua_state)
> + return;
> +
> + lua_close(filter->lua_state);
> + filter->lua_state = NULL;
> + if (filter->script_file) {
> + free(filter->script_file);
> + filter->script_file = NULL;
> + }
> +}
> +
> +static int init_lua_filter(struct lua_filter *filter)
> +{
> + if (filter->lua_state)
> + return 0;
> +
> + if (!(filter->lua_state = luaL_newstate()))
> + return 1;
> +
> + luaL_openlibs(filter->lua_state);
> +
> + lua_pushcfunction(filter->lua_state, html_lua_filter);
> + lua_setglobal(filter->lua_state, "html");
It would be good to provide some of the other html_* functions here,
particularly html_txt so that filters don't need to re-invent the wheel
for escaping output. That's probably slightly harder than the plain
HTML, but I suspect we just need to wrap the call to the underlying
function in an unhook_write/hook_write pair.
> +
> + if (luaL_dofile(filter->lua_state, filter->script_file)) {
> + lua_close(filter->lua_state);
> + filter->lua_state = NULL;
> + return 1;
> + }
> + return 0;
> +}
> +
> +static int open_lua_filter(struct cgit_filter *base, va_list ap)
> +{
> + struct lua_filter *filter = (struct lua_filter *) base;
> + int i;
> +
> + if (init_lua_filter(filter))
> + return 1;
> +
> + hook_write(base, write_lua_filter);
> +
> + lua_getglobal(filter->lua_state, "filter_open");
> + for (i = 0; i < filter->base.argument_count; ++i)
> + lua_pushstring(filter->lua_state, va_arg(ap, char *));
> + if (lua_pcall(filter->lua_state, filter->base.argument_count, 0, 0))
> + return 1;
> + return 0;
> +}
> +
> +static int close_lua_filter(struct cgit_filter *base)
> +{
> + struct lua_filter *filter = (struct lua_filter *) base;
> + int ret = 0;
> +
> + lua_getglobal(filter->lua_state, "filter_close");
> + if (lua_pcall(filter->lua_state, 0, 0, 0))
> + ret = 1;
> + unhook_write();
> + return ret;
> +}
> +
> +static void fprintf_lua_filter(struct cgit_filter *base, FILE *f, const char *prefix)
> +{
> + struct lua_filter *filter = (struct lua_filter *) base;
> + fprintf(f, "%slua:%s\n", prefix, filter->script_file);
> +}
> +
> +
> +static struct cgit_filter *new_lua_filter(const char *cmd, int argument_count)
> +{
> + struct lua_filter *filter;
> +
> + filter = xmalloc(sizeof(*filter));
> + memset(filter, 0, sizeof(*filter));
> + filter->base.open = open_lua_filter;
> + filter->base.close = close_lua_filter;
> + filter->base.fprintf = fprintf_lua_filter;
> + filter->base.cleanup = cleanup_lua_filter;
> + filter->base.argument_count = argument_count;
> + filter->script_file = xstrdup(cmd);
> +
> + return &filter->base;
> }
>
> +#endif
next prev parent reply other threads:[~2014-01-13 8:55 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-13 4:11 [PATCH 00/12] filter framework and lua integration: complete Jason
2014-01-13 4:11 ` [PATCH 01/12] filter: add fprintf_filter function Jason
2014-01-13 4:11 ` [PATCH 02/12] filter: add interface layer Jason
2014-01-13 4:11 ` [PATCH 03/12] filter: introduce "filter type" prefix Jason
2014-01-13 4:11 ` [PATCH 04/12] filter: allow for cleanup hook for filter types Jason
2014-01-13 4:11 ` [PATCH 05/12] filter: basic write hooking infrastructure Jason
2014-01-13 8:19 ` cgit
2014-01-13 4:11 ` [PATCH 06/12] filter: add preliminary lua support Jason
2014-01-13 8:31 ` cgit
2014-01-13 8:53 ` john
2014-01-13 8:39 ` cgit
2014-01-13 8:55 ` john [this message]
2014-01-13 9:41 ` bluewind
2014-01-13 4:11 ` [PATCH 07/12] filter: document lua filter type Jason
2014-01-13 4:11 ` [PATCH 08/12] filter: lua error reporting Jason
2014-01-13 4:11 ` [PATCH 09/12] filter: return on null filter from open and close Jason
2014-01-13 4:11 ` [PATCH 10/12] filter: add support for email filter Jason
2014-01-13 4:11 ` [PATCH 11/12] filter: add simple gravatar " Jason
2014-01-13 4:11 ` [PATCH 12/12] filter: add gravatar lua script Jason
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