154 lines
5.3 KiB
C
154 lines
5.3 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <libpika/pika.h>
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#include "script-fu-types.h" /* SFScript */
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#include "script-fu-lib.h"
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#include "script-fu-script.h"
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#include "script-fu-command.h"
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/* Methods for interpreting commands.
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*
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* Usually there is a stack of calls similar to:
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* script_fu_run_image_procedure (outer run func)
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* calls script_fu_interpret_image_proc
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* calls script_fu_run_command
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* calls ts_interpret_string
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* calls the inner run func in Scheme
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*
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* but script_fu_run_command is also called directly for loading scripts.
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*
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* FUTURE: see also similar code in script-fu-interface.c
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* which could be migrated here.
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*/
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/* Interpret a command.
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*
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* When errors during interpretation:
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* 1) set the error message from tinyscheme into GError at given handle.
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* 2) return FALSE
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* otherwise, return TRUE and discard any result of interpretation
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* ScriptFu return values only have a PikaPDBStatus,
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* since ScriptFu plugin scripts can only be declared returning void.
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*
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* While interpreting, any errors from further calls to the PDB
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* can show error dialogs in any PIKA gui,
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* unless the caller has taken responsibility with a prior call to
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* pika_plug_in_set_pdb_error_handler
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*
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* FIXME: see script_fu_run_procedure.
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* It does not call pika_plug_in_set_pdb_error_handler for NON-INTERACTIVE mode.
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*/
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gboolean
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script_fu_run_command (const gchar *command,
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GError **error)
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{
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GString *output;
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gboolean success = FALSE;
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g_debug ("script_fu_run_command: %s", command);
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output = g_string_new (NULL);
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script_fu_redirect_output_to_gstr (output);
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if (script_fu_interpret_string (command))
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{
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g_set_error (error, PIKA_PLUG_IN_ERROR, 0, "%s", output->str);
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}
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else
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{
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success = TRUE;
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}
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g_string_free (output, TRUE);
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return success;
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}
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/* Interpret a script that defines a PikaImageProcedure.
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*
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* Similar to v2 code in script-fu-interface.c, except:
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* 1) builds a command from a GValueArray from a PikaConfig,
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* instead of from local array of SFArg.
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* 2) adds actual args image, drawable, etc. for PikaImageProcedure
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*/
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PikaValueArray *
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script_fu_interpret_image_proc (PikaProcedure *procedure,
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SFScript *script,
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PikaImage *image,
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guint n_drawables,
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PikaDrawable **drawables,
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PikaProcedureConfig *config)
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{
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gchar *command;
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PikaValueArray *result = NULL;
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gboolean interpretation_result;
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GError *error = NULL;
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command = script_fu_script_get_command_for_image_proc (script, image, n_drawables, drawables, config);
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/* Take responsibility for handling errors from the scripts further calls to PDB.
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* ScriptFu does not show an error dialog, but forwards errors back to PIKA.
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* This only tells PIKA that ScriptFu itself will forward PikaPDBStatus errors from
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* this scripts calls to the PDB.
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* The onus is on this script's called PDB procedures to return errors in the PikaPDBStatus.
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* Any that do not, but for example only call pika-message, are breaching contract.
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*/
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pika_plug_in_set_pdb_error_handler (pika_get_plug_in (),
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PIKA_PDB_ERROR_HANDLER_PLUGIN);
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interpretation_result = script_fu_run_command (command, &error);
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g_free (command);
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if (! interpretation_result)
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{
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/* This is to the console.
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* script->name not localized.
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* error->message expected to be localized.
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* PIKA will later display "PDB procedure failed: <message>" localized.
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*/
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g_warning ("While executing %s: %s",
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script->name,
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error->message);
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/* A GError was allocated and this will take ownership. */
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result = pika_procedure_new_return_values (procedure,
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PIKA_PDB_EXECUTION_ERROR,
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error);
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}
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else
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{
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result = pika_procedure_new_return_values (procedure,
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PIKA_PDB_SUCCESS,
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NULL);
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}
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pika_plug_in_set_pdb_error_handler (pika_get_plug_in (),
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PIKA_PDB_ERROR_HANDLER_INTERNAL);
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return result;
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}
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