OVMS3-idf/components/console/esp_console.h
2017-08-21 15:58:27 +08:00

181 lines
6.2 KiB
C

// Copyright 2016-2017 Espressif Systems (Shanghai) PTE LTD
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#pragma once
#include <stddef.h>
#include "esp_err.h"
// Forward declaration. Definition in linenoise/linenoise.h.
typedef struct linenoiseCompletions linenoiseCompletions;
/**
* @brief Parameters for console initialization
*/
typedef struct {
size_t max_cmdline_length; //!< length of command line buffer, in bytes
size_t max_cmdline_args; //!< maximum number of command line arguments to parse
int hint_color; //!< ASCII color code of hint text
int hint_bold; //!< Set to 1 to print hint text in bold
} esp_console_config_t;
/**
* @brief initialize console module
* Call this once before using other console module features
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM if out of memory
* - ESP_ERR_INVALID_STATE if already initialized
*/
esp_err_t esp_console_init(const esp_console_config_t* config);
/**
* @brief de-initialize console module
* Call this once when done using console module functions
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE if not initialized yet
*/
esp_err_t esp_console_deinit();
/**
* @brief Console command main function
* @param argc number of arguments
* @param argv array with argc entries, each pointing to a zero-terminated string argument
* @return console command return code, 0 indicates "success"
*/
typedef int (*esp_console_cmd_func_t)(int argc, char** argv);
/**
* @brief Console command description
*/
typedef struct {
/**
* Command name. Must not be NULL, must not contain spaces.
* The pointer must be valid until the call to esp_console_deinit.
*/
const char* command; //!< command name
/**
* Help text for the command, shown by help command.
* If set, the pointer must be valid until the call to esp_console_deinit.
* If not set, the command will not be listed in 'help' output.
*/
const char* help;
/**
* Hint text, usually lists possible arguments.
* If set to NULL, and 'argtable' field is non-NULL, hint will be generated
* automatically
*/
const char* hint;
/**
* Pointer to a function which implements the command.
*/
esp_console_cmd_func_t func;
/**
* Array or structure of pointers to arg_xxx structures, may be NULL.
* Used to generate hint text if 'hint' is set to NULL.
* Array/structure which this field points to must end with an arg_end.
* Only used for the duration of esp_console_cmd_register call.
*/
void* argtable;
} esp_console_cmd_t;
/**
* @brief Register console command
* @param cmd pointer to the command description; can point to a temporary value
* @return
* - ESP_OK on success
* - ESP_ERR_NO_MEM if out of memory
*/
esp_err_t esp_console_cmd_register(const esp_console_cmd_t *cmd);
/**
* @brief Run command line
* @param cmdline command line (command name followed by a number of arguments)
* @param[out] cmd_ret return code from the command (set if command was run)
* @return
* - ESP_OK, if command was run
* - ESP_ERR_NOT_FOUND, if command with given name wasn't registered
* - ESP_ERR_INVALID_STATE, if esp_console_init wasn't called
*/
esp_err_t esp_console_run(const char* cmdline, int* cmd_ret);
/**
* @brief Split command line into arguments in place
*
* - This function finds whitespace-separated arguments in the given input line.
*
* 'abc def 1 20 .3' -> [ 'abc', 'def', '1', '20', '.3' ]
*
* - Argument which include spaces may be surrounded with quotes. In this case
* spaces are preserved and quotes are stripped.
*
* 'abc "123 456" def' -> [ 'abc', '123 456', 'def' ]
*
* - Escape sequences may be used to produce backslash, double quote, and space:
*
* 'a\ b\\c\"' -> [ 'a b\c"' ]
*
* Pointers to at most argv_size - 1 arguments are returned in argv array.
* The pointer after the last one (i.e. argv[argc]) is set to NULL.
*
* @param line pointer to buffer to parse; it is modified in place
* @param argv array where the pointers to arguments are written
* @param argv_size number of elements in argv_array (max. number of arguments)
* @return number of arguments found (argc)
*/
size_t esp_console_split_argv(char *line, char **argv, size_t argv_size);
/**
* @brief Callback which provides command completion for linenoise library
*
* When using linenoise for line editing, command completion support
* can be enabled like this:
*
* linenoiseSetCompletionCallback(&esp_console_get_completion);
*
* @param buf the string typed by the user
* @param lc linenoiseCompletions to be filled in
*/
void esp_console_get_completion(const char *buf, linenoiseCompletions *lc);
/**
* @brief Callback which provides command hints for linenoise library
*
* When using linenoise for line editing, hints support can be enabled as
* follows:
*
* linenoiseSetHintsCallback((linenoiseHintsCallback*) &esp_console_get_hint);
*
* The extra cast is needed because linenoiseHintsCallback is defined as
* returning a char* instead of const char*.
*
* @param buf line typed by the user
* @param[out] color ANSI color code to be used when displaying the hint
* @param[out] bold set to 1 if hint has to be displayed in bold
* @return string containing the hint text. This string is persistent and should
* not be freed (i.e. linenoiseSetFreeHintsCallback should not be used).
*/
const char *esp_console_get_hint(const char *buf, int *color, int *bold);
/**
* @brief Register a 'help' command
* Default 'help' command prints the list of registered commands along with
* hints and help strings.
* @return
* - ESP_OK on success
* - ESP_ERR_INVALID_STATE, if esp_console_init wasn't called
*/
esp_err_t esp_console_register_help_command();