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fix #4

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prozessorkern 2019-06-24 23:32:40 +02:00
commit 4dd1b0638f
9 changed files with 1088 additions and 844 deletions
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src/shellmatta.c
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@ -13,846 +13,19 @@
*/ */
/** /**
* @addtogroup shellmatta
* @{
* @addtogroup shellmatta_private * @addtogroup shellmatta_private
* @{ * @{
*/ */
#include "shellmatta.h" #include "shellmatta.h"
#include <stdio.h> #include "shellmatta_autocomplete.h"
#include "shellmatta_history.h"
#include "shellmatta_utils.h"
#include "shellmatta_escape.h"
#include <stddef.h> #include <stddef.h>
#include <string.h> #include <string.h>
#include <stdarg.h> #include <stdarg.h>
#include <stdio.h>
/* defines */
#ifndef SHELLMATTA_OUTPUT_BUFFER_SIZE
#define SHELLMATTA_OUTPUT_BUFFER_SIZE 128u
#endif
#define SHELLMATTA_MIN(a,b) (((a) > (b)) ? (b) : (a))
#define SHELLMATTA_MAX(a,b) (((a) < (b)) ? (b) : (a))
#define SHELLMATTA_PRINT_BUFFER(buffer,cnt,fct) \
while((cnt) > sizeof((buffer))) \
{ \
(cnt) -= sizeof((buffer)); \
(fct)((buffer), sizeof((buffer))); \
} \
if((cnt) != 0u) \
{ \
(fct)((buffer), (cnt)); \
}
#define SHELLMATTA_MAGIC 0x5101E110u
/* static functions */
/**
* @brief function to write an echo to the output depending on
* the echo enabled state of the instance
* @param[in] inst pointer to a shellmatta instance
* @param[in] data pointer to the data so send
* @param[in] length length of the data to send (in byte)
*/
static void writeEcho( shellmatta_instance_t *inst,
const char *data,
uint32_t length)
{
if(true == inst->echoEnabled)
{
inst->write(data, length);
}
}
/**
* @brief itoa like function to convert int to an ascii string
* @warning you have to provide a large enough buffer
* @param[in] value
* @param[in,out] buffer
* @param[in] base
* @return number of bytes in string
*/
static uint32_t shellItoa(int32_t value, char *buffer, uint32_t base)
{
char tempBuffer[34u];
uint32_t i;
uint32_t bufferIdx = 0u;
char digitValue;
/** -# check the base for plausibility */
if((2 <= base) && (16 >= base))
{
/** -# check for sign */
if(0 > value)
{
value = value * (-1);
buffer[0u] = '-';
bufferIdx += 1u;
}
/** -# loop through all digits in reverse order */
i = 0u;
do
{
digitValue = (char) (value % base);
tempBuffer[i] = (digitValue < 10u) ? ('0' + digitValue) : (('A' - 10) + digitValue);
value /= base;
i ++;
}while(value > 0);
/** -# store the string in the correct order onto the buffer */
while(i > 0u)
{
buffer[bufferIdx] = tempBuffer[i - 1u];
i --;
bufferIdx ++;
}
}
return bufferIdx;
}
/**
* @brief appends a byte to the history ring stack buffer
* @param[in] inst pointer to a shellmatta instance
* @param[in] byte byte to append to the history buffer
*/
static void appendHistoryByte(shellmatta_instance_t *inst, char byte)
{
/** -# calculate the new history buffer index */
inst->historyEnd ++;
if(inst->historyEnd >= inst->historyBufferSize)
{
inst->historyEnd = 0u;
}
/** -# append the byte */
inst->historyBuffer[inst->historyEnd] = byte;
/** -# check if the we overwrite an existing stored command */
if(inst->historyEnd == inst->historyStart)
{
/** -# move the start pointer to the next termination (0) */
do
{
inst->historyStart ++;
if(inst->historyStart >= inst->historyBufferSize)
{
inst->historyStart = 0u;
}
}while(0u != inst->historyBuffer[inst->historyStart]);
}
}
/**
* @brief reads a byte from the history buffer and decreases the read index
* @param[in] inst pointer to a shellmatta instance
* @param[out] byte pointer to a char where the read out byte will be stored
* @return
*/
static bool getHistoryByte(shellmatta_instance_t *inst, char *byte)
{
bool ret = false;
/** -# check if we have reached the end of the buffer already */
if(inst->historyRead != inst->historyStart)
{
/** -# read out one byte and decrease the read index */
*byte = inst->historyBuffer[inst->historyRead];
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
ret = true;
}
return ret;
}
/**
* @brief stores the current command from the instances buffer into the
* history buffer
* @param[in] inst pointer to a shellmatta instance
*/
static void storeHistoryCmd(shellmatta_instance_t *inst)
{
uint32_t i;
/** -# check if we have enough room for the command in the history buffer
* and there is a new command to be stored */
if( (inst->historyBufferSize > inst->inputCount)
&& (0u != inst->inputCount)
&& (true == inst->dirty))
{
/** -# append the command termination */
appendHistoryByte(inst, 0u);
/** -# append the command byte wise in reverse direction */
for(i = inst->inputCount; i > 0u; i --)
{
appendHistoryByte(inst, inst->buffer[i - 1u]);
}
}
/** -# remove the dirty flag - everything is nice and saved */
inst->dirty = false;
}
/**
* @brief navigates in the history buffer by the given number of commands
* @param[in] inst pointer to a shellmatta instance
* @param[in] cnt direction and count to navigate
* @return
*/
static bool navigateHistoryCmd(shellmatta_instance_t *inst, int32_t cnt)
{
bool ret = true;
uint32_t tempReadIdx = 0u;
while((cnt > 0) && (true == ret))
{
if(inst->historyRead != inst->historyEnd)
{
inst->historyRead ++;
}
while(inst->historyRead != inst->historyEnd)
{
inst->historyRead ++;
if(inst->historyRead >= inst->historyBufferSize)
{
inst->historyRead = 0u;
}
if( (inst->historyRead != inst->historyEnd)
&& (0u == inst->historyBuffer[inst->historyRead]))
{
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
cnt -= 1;
break;
}
}
if(inst->historyRead == inst->historyEnd)
{
ret = false;
}
}
while((cnt < 0) && (true == ret))
{
tempReadIdx = inst->historyRead;
while(inst->historyRead != inst->historyStart)
{
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
if( (inst->historyRead != inst->historyStart)
&& (0u == inst->historyBuffer[inst->historyRead]))
{
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
cnt += 1;
break;
}
}
if(inst->historyRead == inst->historyStart)
{
inst->historyRead = tempReadIdx;
inst->historyReadUp = false;
ret = false;
}
}
return ret;
}
/**
* @brief restores the command from the history buffer where the read
* index points on
* @param[in] inst pointer to a shellmatta instance
*/
static void restoreHistoryCmd(shellmatta_instance_t *inst)
{
char byte;
bool ret = true;
ret = getHistoryByte(inst, &byte);
while((ret == true) && (byte != 0u))
{
inst->buffer[inst->inputCount] = byte;
inst->inputCount ++;
inst->cursor ++;
ret = getHistoryByte(inst, &byte);
}
writeEcho(inst, inst->buffer, inst->inputCount);
navigateHistoryCmd(inst, 1);
inst->dirty = false;
}
/**
* @brief resets the history buffer pointers to show to the most recent
* command again
* @param[in] inst pointer to a shellmatta instance
*/
static void resetHistoryBuffer(shellmatta_instance_t *inst)
{
inst->historyRead = inst->historyEnd;
inst->historyReadUp = true;
}
/**
* @brief tells the terminal to save the current cursor position
* @param[in] inst pointer to shellmatta instance
*/
static void saveCursorPos(shellmatta_instance_t *inst)
{
writeEcho(inst, "\e[s", 3u);
}
/**
* @brief tells the terminal to restore the saved cursor position
* @param[in] inst pointer to shellmatta instance
*/
static void restoreCursorPos(shellmatta_instance_t *inst)
{
writeEcho(inst, "\e[u", 3u);
}
/**
* @brief tells the terminal to erase the line on the right side of the
* cursor
* @param[in] inst pointer to shellmatta instance
*/
static void eraseLine(shellmatta_instance_t *inst)
{
writeEcho(inst, "\e[K", 3u);
}
/**
* @brief moves the cursor back by the given amoung of characters
* @param[in] inst pointer to shellmatta instance
* @param[in] length number of characters to rewind
*/
static void rewindCursor(shellmatta_instance_t *inst, uint32_t length)
{
char terminalCmd[16];
size_t size;
length = SHELLMATTA_MIN (length, inst->cursor);
if(length > 0u)
{
terminalCmd[0] = '\e';
terminalCmd[1] = '[';
size = 2u + shellItoa(length, &terminalCmd[2], 10);
terminalCmd[size] = 'D';
writeEcho(inst, terminalCmd, size + 1u);
inst->cursor -= length;
}
}
/**
* @brief moves the cursor forward by the given amoung of characters
* @param[in] inst pointer to shellmatta instance
* @param[in] length number of characters to move forward
*/
static void forwardCursor(shellmatta_instance_t *inst, uint32_t length)
{
char terminalCmd[16];
size_t size;
length = SHELLMATTA_MAX (length, (inst->inputCount - inst->cursor));
if (length > 0u)
{
terminalCmd[0] = '\e';
terminalCmd[1] = '[';
size = 2u + shellItoa(length, &terminalCmd[2], 10);
terminalCmd[size] = 'C';
writeEcho(inst, terminalCmd, size + 1u);
inst->cursor += length;
}
}
/**
* @brief inserts the given amount of characters at the cursor position
* @param[in] inst pointer to shellmatta instance
* @param[in] data pointer to the data to be inserted
* @param[in] length length of the data to be inserted
*/
static void insertChars(shellmatta_instance_t *inst,
char *data,
uint32_t length)
{
if(0u != length)
{
/** -# check if we have to move chars in the buffer */
if( (inst->cursor != inst->inputCount)
&& (SHELLMATTA_MODE_INSERT == inst->mode))
{
/** -# move the existing chars */
for ( uint32_t i = inst->inputCount;
i > inst->cursor;
i --)
{
inst->buffer[i + length - 1] = inst->buffer[i - 1];
}
/** -# store and print the new chars */
memcpy(&(inst->buffer[inst->cursor]), data, length);
writeEcho(inst, data, length);
/** -# print the other chars and restore the cursor to this position */
eraseLine(inst);
saveCursorPos(inst);
writeEcho( inst,
&(inst->buffer[inst->cursor + length]),
inst->inputCount - inst->cursor);
restoreCursorPos(inst);
}
/** -# just overwrite/append the chars */
else
{
memcpy(&(inst->buffer[inst->cursor]), data, length);
writeEcho(inst, data, length);
}
inst->inputCount += length;
inst->cursor += length;
}
}
/**
* @brief removes the given amount of characters from the current cursor
* position
* @param[in] inst pointer to a shellmatta instance
* @param[in] length number of characters to remove
* @param[in] backspace remove characters left of the cursor
*/
static void removeChars(shellmatta_instance_t *inst,
uint32_t length,
bool backspace)
{
if(0u != length)
{
/** -# rewind the cursor in case of backspace */
if(true == backspace)
{
length = SHELLMATTA_MIN (length, inst->cursor);
rewindCursor(inst, length);
}
else
{
length = SHELLMATTA_MIN (length, inst->inputCount - inst->cursor);
}
/** -# delete the char at the cursor position */
for ( uint32_t i = inst->cursor;
i < (inst->inputCount - length);
i++)
{
inst->buffer[i] = inst->buffer[i + length];
}
/** -# print the rest of the line again */
eraseLine(inst);
saveCursorPos(inst);
writeEcho( inst,
&(inst->buffer[inst->cursor]),
(inst->inputCount - inst->cursor - length));
restoreCursorPos(inst);
inst->inputCount -= length;
}
}
/**
* @brief clears the input buffer and removes the currend command from
* the terminal output
* @param[in] inst pointer to a shellmatta instance
*/
static void clearInput(shellmatta_instance_t *inst)
{
rewindCursor(inst, inst->cursor);
eraseLine(inst);
inst->inputCount = 0u;
inst->dirty = false;
}
/**
* @brief processes the excape character stream of the instance and chacks
* if an arrow key was pressed
* @param[in] inst pointer to a shellmatta instance
* @return #SHELLMATTA_OK if an arrow key was pressed
*/
static shellmatta_retCode_t processArrowKeys(shellmatta_instance_t *inst)
{
shellmatta_retCode_t ret = SHELLMATTA_USE_FAULT;
if ('[' == inst->escapeChars[0])
{
ret = SHELLMATTA_OK;
switch (inst->escapeChars[1])
{
case 'A': /* arrow up */
storeHistoryCmd(inst);
if(false == inst->historyReadUp)
{
navigateHistoryCmd(inst, -1);
}
inst->historyReadUp = true;
clearInput(inst);
restoreHistoryCmd(inst);
navigateHistoryCmd(inst, -1);
break;
case 'B': /* arrow down */
if((inst->historyRead != inst->historyEnd))
{
storeHistoryCmd(inst);
if(true == inst->historyReadUp)
{
navigateHistoryCmd(inst, 1);
}
inst->historyReadUp = false;
navigateHistoryCmd(inst, 1);
clearInput(inst);
restoreHistoryCmd(inst);
}
break;
case 'C': /* arrow right */
forwardCursor(inst, 1u);
break;
case 'D': /* arrow left */
rewindCursor(inst, 1u);
break;
default:
/** ignore unknown escape */
ret = SHELLMATTA_USE_FAULT;
break;
}
}
return ret;
}
/**
* @brief handles a ANSI escape sequence to be able to react to some
* special keys
* @param[in] inst pointer to a shellmatta instance
* @param[in] data new received character of the escape sequence
*/
static void handleEscapeSequence(shellmatta_instance_t *inst, char data)
{
switch (inst->escapeCounter)
{
case 1u:
inst->escapeChars[inst->escapeCounter - 1] = data;
inst->escapeCounter ++;
break;
case 2u:
inst->escapeChars[inst->escapeCounter - 1] = data;
/** -# check if an arrow key was pressed */
if(SHELLMATTA_OK == processArrowKeys(inst))
{
inst->escapeCounter = 0u;
}
/** -# check if end was pressed */
else if ( (0x4f == inst->escapeChars[0])
&& (0x46 == inst->escapeChars[1]))
{
forwardCursor(inst, inst->inputCount - inst->cursor);
inst->escapeCounter = 0u;
}
/** -# if the highest bit is not set this is usually not the end of the
* sequence - so we go on */
else if(0u == (0x40 & data))
{
inst->escapeCounter ++;
}
else
{
inst->escapeCounter = 0u;
}
break;
case 3u:
/** -# check if delete was pressed */
inst->escapeChars[inst->escapeCounter - 1] = data;
if( (0x5b == inst->escapeChars[0])
&& (0x33 == inst->escapeChars[1])
&& (0x7e == inst->escapeChars[2]))
{
removeChars(inst, 1u, false);
inst->escapeCounter = 0u;
}
/** -# check if pos1 was pressed */
else if ( (0x5bu == inst->escapeChars[0])
&& (0x31u == inst->escapeChars[1])
&& (0x7eu == inst->escapeChars[2]))
{
rewindCursor(inst, inst->cursor);
inst->escapeCounter = 0u;
}
else if(0u == (0x40u & data))
{
inst->escapeCounter ++;
}
else
{
inst->escapeCounter = 0u;
}
break;
default:
inst->escapeCounter = 0u;
break;
}
}
/**
* @brief terminates an input and prints the prompt again
* @param[in] inst pointer to a shellmatta instance
*/
static void terminateInput(shellmatta_instance_t *inst)
{
inst->inputCount = 0u;
inst->cursor = 0u;
inst->write("\r\n", 2u);
inst->write(inst->prompt, strlen(inst->prompt));
}
/**
* @brief searches the registered commands for matching ones and prints
* the common part of all matching commands on the output
* if called twice all matching commands are printed
* @param[in] inst pointer to a shellmatta instance
*/
static void doAutocomplete(shellmatta_instance_t *inst)
{
shellmatta_cmd_t *cmd = inst->cmdList;
char *tempCmd = NULL;
uint32_t minLen = 0u;
uint32_t sizeDiff = 0u;
bool exactMatch = true;
uint32_t printedLen = 0u;
uint32_t tempCursor = 0u;
/** -# increase the tab counter to print all matching commands next time */
inst->tabCounter++;
/** -# on douple tab show all matching commands */
if (1u < inst->tabCounter)
{
inst->tabCounter = 0u;
/** -# loop through all registered commands */
while (NULL != cmd)
{
/** -# check if command matches the input */
if( (strlen(cmd->cmd) >= inst->cursor)
&& (0u == memcmp(cmd->cmd, inst->buffer, inst->cursor)))
{
/** -# add newline on first find */
if(0u == printedLen)
{
inst->write("\r\n", 2u);
}
inst->write(cmd->cmd, strlen(cmd->cmd));
printedLen += strlen(cmd->cmd);
inst->write(" ", 4u);
printedLen += 4u;
}
/** -# check if command alias matches the input */
if( (strlen(cmd->cmdAlias) >= inst->cursor)
&& (0u == memcmp(cmd->cmdAlias, inst->buffer, inst->cursor)))
{
/** -# add newline on first find */
if(0u == printedLen)
{
inst->write("\r\n", 2u);
}
inst->write(cmd->cmdAlias, strlen(cmd->cmdAlias));
printedLen += strlen(cmd->cmdAlias);
inst->write(" ", 4u);
printedLen += 4u;
}
cmd = cmd->next;
}
/** -# print input again if a commands was found */
if(printedLen > 0u)
{
writeEcho(inst, "\r\n", 2u);
writeEcho(inst, inst->prompt, strlen(inst->prompt));
writeEcho(inst, inst->buffer, inst->inputCount);
tempCursor = inst->cursor;
inst->cursor = inst->inputCount;
rewindCursor(inst, inst->inputCount - tempCursor);
}
}
/** -# on single tab autocomplete as far as possible */
else if(0u != inst->cursor)
{
/** -# loop through all registered commands */
while (NULL != cmd)
{
/** -# check if command matches the input */
if( (strlen(cmd->cmd) >= inst->cursor)
&& (0u == memcmp(cmd->cmd, inst->buffer, inst->cursor)))
{
/** -# store first match */
if(NULL == tempCmd)
{
tempCmd = cmd->cmd;
minLen = strlen(cmd->cmd);
}
/** -# find common part of the matching commands */
else
{
exactMatch = false;
minLen = SHELLMATTA_MIN(strlen(cmd->cmd), minLen);
for(uint32_t i = 0u; i < minLen; i++)
{
if(cmd->cmd[i] != tempCmd[i])
{
minLen = i;
}
}
}
}
/** -# check if command Alias matches the input */
if( (strlen(cmd->cmdAlias) >= inst->cursor)
&& (0u == memcmp(cmd->cmdAlias, inst->buffer, inst->cursor)))
{
/** -# store first match */
if(NULL == tempCmd)
{
tempCmd = cmd->cmdAlias;
minLen = strlen(cmd->cmdAlias);
}
/** -# find common part of the matches */
else
{
exactMatch = false;
minLen = SHELLMATTA_MIN(strlen(cmd->cmdAlias), minLen);
for(uint32_t i = 0u; i < minLen; i++)
{
if(cmd->cmdAlias[i] != tempCmd[i])
{
minLen = i;
}
}
}
}
cmd = cmd->next;
}
/** -# autocomplete found command */
if(NULL != tempCmd)
{
/** -# calculate the size of the command to be inserted */
sizeDiff = minLen - inst->cursor;
/** -# copy the found part into the buffer and display it */
insertChars(inst, &(tempCmd[inst->cursor]), sizeDiff);
/** -# on exact match there is no need to double Tab to display all */
if(true == exactMatch)
{
inst->tabCounter = 0u;
}
}
}
else
{
/* nothing to do here */
}
}
/**
* @brief prints all possible commands with description and usage
* @param[in] handle handle shellmatta instance handle
* @param[in] arguments not used here
* @param[in] length not used here
* @return #SHELLMATTA_OK
* #SHELLMATTA_ERROR (buffer overflow)
*/
static shellmatta_retCode_t helpCmdFct(shellmatta_handle_t handle, const char *arguments, uint32_t length)
{
shellmatta_retCode_t ret = SHELLMATTA_OK;
shellmatta_instance_t *inst = (shellmatta_instance_t*) handle;
shellmatta_cmd_t *cmd = inst->cmdList;
size_t maxCmdLen = 0u;
size_t maxCmdAliasLen = 0u;
size_t maxCmdHelpLen = 0u;
size_t cmdLen = 0u;
size_t cmdAliasLen = 0u;
size_t cmdHelpLen = 0u;
uint32_t tabCnt = 0u;
static const char tabBuffer[] = { ' ', ' ', ' ', ' ',
' ', ' ', ' ', ' ',
' ', ' ', ' ', ' ',
' ', ' ', ' ', ' '};
/** -# loop through all commands to determine the lengths of each cmd */
while(NULL != cmd)
{
maxCmdLen = SHELLMATTA_MAX(maxCmdLen, strlen(cmd->cmd));
maxCmdAliasLen = SHELLMATTA_MAX(maxCmdAliasLen, strlen(cmd->cmdAlias));
maxCmdHelpLen = SHELLMATTA_MAX(maxCmdHelpLen, strlen(cmd->helpText));
cmd = cmd->next;
}
/** -# loop through all commands and print all possible information */
cmd = inst->cmdList;
while(NULL != cmd)
{
/** -# determine the length of each field to add padding */
cmdLen = strlen(cmd->cmd);
cmdAliasLen = strlen(cmd->cmdAlias);
cmdHelpLen = strlen(cmd->helpText);
inst->write(cmd->cmd, strlen(cmd->cmd));
tabCnt = (maxCmdLen - cmdLen) + 2u;
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
inst->write(cmd->cmdAlias, strlen(cmd->cmdAlias));
tabCnt = (maxCmdAliasLen - cmdAliasLen) + 2u;
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
inst->write(cmd->helpText, strlen(cmd->helpText));
tabCnt = (maxCmdHelpLen - cmdHelpLen) + 2u;
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
inst->write(cmd->usageText, strlen(cmd->usageText));
inst->write("\r\n", 2u);
cmd = cmd->next;
}
(void)arguments;
(void)length;
return ret;
}
shellmatta_cmd_t helpCmd = {"help", "h", "Print this help text", "help", helpCmdFct, NULL};
/* interface functions */
/** /**
* @} * @}
@ -928,7 +101,7 @@ shellmatta_retCode_t shellmatta_doInit(
*handle = (shellmatta_handle_t)inst; *handle = (shellmatta_handle_t)inst;
/** -# print the first prompt */ /** -# print the first prompt */
terminateInput(inst); utils_terminateInput(inst);
} }
return SHELLMATTA_OK; return SHELLMATTA_OK;
@ -1034,7 +207,7 @@ shellmatta_retCode_t shellmatta_processData(shellmatta_handle_t handle,
/** -# handle escape sequences */ /** -# handle escape sequences */
if(inst->escapeCounter != 0u) if(inst->escapeCounter != 0u)
{ {
handleEscapeSequence(inst, *data); escape_handleSequence(inst, *data);
} }
/** -# handle return as start of processing the command */ /** -# handle return as start of processing the command */
else if ('\r' == *data) else if ('\r' == *data)
@ -1044,8 +217,8 @@ shellmatta_retCode_t shellmatta_processData(shellmatta_handle_t handle,
/** -# store the current command and reset the history buffer */ /** -# store the current command and reset the history buffer */
inst->dirty = true; inst->dirty = true;
storeHistoryCmd(inst); history_storeCmd(inst);
resetHistoryBuffer(inst); history_reset(inst);
/** -# search for a matching command */ /** -# search for a matching command */
while (NULL != cmd) while (NULL != cmd)
@ -1072,33 +245,33 @@ shellmatta_retCode_t shellmatta_processData(shellmatta_handle_t handle,
inst->write(inst->buffer, inst->inputCount); inst->write(inst->buffer, inst->inputCount);
inst->write(" not found", 10u); inst->write(" not found", 10u);
} }
terminateInput(inst); utils_terminateInput(inst);
} }
/** -# check for tabulator key - auto complete */ /** -# check for tabulator key - auto complete */
else if('\t' == *data) else if('\t' == *data)
{ {
inst->dirty = true; inst->dirty = true;
doAutocomplete(inst); autocomplete_run(inst);
} }
/** -# check for cancel - /** -# check for cancel -
* terminate current input and print prompt again */ * terminate current input and print prompt again */
else if(3 == *data) else if(3 == *data)
{ {
inst->dirty = false; inst->dirty = false;
resetHistoryBuffer(inst); history_reset(inst);
terminateInput(inst); utils_terminateInput(inst);
} }
/** -# check for backspace */ /** -# check for backspace */
else if('\b' == *data) else if('\b' == *data)
{ {
inst->dirty = true; inst->dirty = true;
removeChars(inst, 1u, true); utils_removeChars(inst, 1u, true);
} }
/** -# check for delete key */ /** -# check for delete key */
else if(0x7eu == *data) else if(0x7eu == *data)
{ {
inst->dirty = true; inst->dirty = true;
removeChars(inst, 1u, false); utils_removeChars(inst, 1u, false);
} }
/** -# check for start of escape sequence */ /** -# check for start of escape sequence */
else if('\e' == *data) else if('\e' == *data)
@ -1108,7 +281,7 @@ shellmatta_retCode_t shellmatta_processData(shellmatta_handle_t handle,
else else
{ {
inst->dirty = true; inst->dirty = true;
insertChars(inst, data, 1); utils_insertChars(inst, data, 1);
} }
/** -# reset tab counter on not a tab */ /** -# reset tab counter on not a tab */
@ -1199,5 +372,4 @@ shellmatta_retCode_t shellmatta_printf( shellmatta_handle_t handle,
#endif #endif
/** @} */ /** @} */
/** @} */

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/*
* Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* @file shellmatta_autocomplete.c
* @brief autocomplete function of shellmatta
* @author Stefan Strobel <stefan.strobel@shimatta.net>
*/
/**
* @addtogroup shellmatta_autocomplete
* @{
*/
#include "shellmatta.h"
#include "shellmatta_autocomplete.h"
#include "shellmatta_utils.h"
#include <stdint.h>
#include <string.h>
/**
* @brief searches the registered commands for matching ones and prints
* the common part of all matching commands on the output
* if called twice all matching commands are printed
* @param[in] inst pointer to a shellmatta instance
*/
void autocomplete_run(shellmatta_instance_t *inst)
{
shellmatta_cmd_t *cmd = inst->cmdList;
char *tempCmd = NULL;
uint32_t minLen = 0u;
uint32_t sizeDiff = 0u;
bool exactMatch = true;
uint32_t printedLen = 0u;
uint32_t tempCursor = 0u;
/** -# increase the tab counter to print all matching commands next time */
inst->tabCounter++;
/** -# on douple tab show all matching commands */
if (1u < inst->tabCounter)
{
inst->tabCounter = 0u;
/** -# loop through all registered commands */
while (NULL != cmd)
{
/** -# check if command matches the input */
if( (strlen(cmd->cmd) >= inst->cursor)
&& (0u == memcmp(cmd->cmd, inst->buffer, inst->cursor)))
{
/** -# add newline on first find */
if(0u == printedLen)
{
inst->write("\r\n", 2u);
}
inst->write(cmd->cmd, strlen(cmd->cmd));
printedLen += strlen(cmd->cmd);
inst->write(" ", 4u);
printedLen += 4u;
}
/** -# check if command alias matches the input */
if( (strlen(cmd->cmdAlias) >= inst->cursor)
&& (0u == memcmp(cmd->cmdAlias, inst->buffer, inst->cursor)))
{
/** -# add newline on first find */
if(0u == printedLen)
{
inst->write("\r\n", 2u);
}
inst->write(cmd->cmdAlias, strlen(cmd->cmdAlias));
printedLen += strlen(cmd->cmdAlias);
inst->write(" ", 4u);
printedLen += 4u;
}
cmd = cmd->next;
}
/** -# print input again if a commands was found */
if(printedLen > 0u)
{
utils_writeEcho(inst, "\r\n", 2u);
utils_writeEcho(inst, inst->prompt, strlen(inst->prompt));
utils_writeEcho(inst, inst->buffer, inst->inputCount);
tempCursor = inst->cursor;
inst->cursor = inst->inputCount;
utils_rewindCursor(inst, inst->inputCount - tempCursor);
}
}
/** -# on single tab autocomplete as far as possible */
else if(0u != inst->cursor)
{
/** -# loop through all registered commands */
while (NULL != cmd)
{
/** -# check if command matches the input */
if( (strlen(cmd->cmd) >= inst->cursor)
&& (0u == memcmp(cmd->cmd, inst->buffer, inst->cursor)))
{
/** -# store first match */
if(NULL == tempCmd)
{
tempCmd = cmd->cmd;
minLen = strlen(cmd->cmd);
}
/** -# find common part of the matching commands */
else
{
exactMatch = false;
minLen = SHELLMATTA_MIN(strlen(cmd->cmd), minLen);
for(uint32_t i = 0u; i < minLen; i++)
{
if(cmd->cmd[i] != tempCmd[i])
{
minLen = i;
}
}
}
}
/** -# check if command Alias matches the input */
if( (strlen(cmd->cmdAlias) >= inst->cursor)
&& (0u == memcmp(cmd->cmdAlias, inst->buffer, inst->cursor)))
{
/** -# store first match */
if(NULL == tempCmd)
{
tempCmd = cmd->cmdAlias;
minLen = strlen(cmd->cmdAlias);
}
/** -# find common part of the matches */
else
{
exactMatch = false;
minLen = SHELLMATTA_MIN(strlen(cmd->cmdAlias), minLen);
for(uint32_t i = 0u; i < minLen; i++)
{
if(cmd->cmdAlias[i] != tempCmd[i])
{
minLen = i;
}
}
}
}
cmd = cmd->next;
}
/** -# autocomplete found command */
if(NULL != tempCmd)
{
/** -# calculate the size of the command to be inserted */
sizeDiff = minLen - inst->cursor;
/** -# copy the found part into the buffer and display it */
utils_insertChars(inst, &(tempCmd[inst->cursor]), sizeDiff);
/** -# on exact match there is no need to double Tab to display all */
if(true == exactMatch)
{
inst->tabCounter = 0u;
}
}
}
else
{
/* nothing to do here */
}
}
/**
* @}
*/

27
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@ -0,0 +1,27 @@
/*
* Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* @file shellmatta_autocomplete.h
* @brief autocomplete function of shellmatta
* @author Stefan Strobel <stefan.strobel@shimatta.net>
*/
/**
* @addtogroup shellmatta_api
* @{
*/
#ifndef _SHELLMATTA_AUTOCOMPLETE_H_
#define _SHELLMATTA_AUTOCOMPLETE_H_
void autocomplete_run(shellmatta_instance_t *inst);
#endif
/** @} */

159
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@ -0,0 +1,159 @@
/*
* Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* @file shellmatta_escape.c
* @brief functions to parse and generate escape sequences
* @author Stefan Strobel <stefan.strobel@shimatta.net>
*/
/**
* @addtogroup shellmatta_escape
* @{
*/
#include "shellmatta.h"
#include "shellmatta_escape.h"
#include "shellmatta_utils.h"
#include "shellmatta_history.h"
#include "shellmatta_autocomplete.h"
#include <stdint.h>
/**
* @brief processes the excape character stream of the instance and chacks
* if an arrow key was pressed
* @param[in] inst pointer to a shellmatta instance
* @return #SHELLMATTA_OK if an arrow key was pressed
*/
shellmatta_retCode_t escape_processArrowKeys(shellmatta_instance_t *inst)
{
shellmatta_retCode_t ret = SHELLMATTA_USE_FAULT;
if ('[' == inst->escapeChars[0])
{
ret = SHELLMATTA_OK;
switch (inst->escapeChars[1])
{
case 'A': /* arrow up */
history_storeCmd(inst);
if(false == inst->historyReadUp)
{
history_navigate(inst, -1);
}
inst->historyReadUp = true;
utils_clearInput(inst);
history_restoreCmd(inst);
history_navigate(inst, -1);
break;
case 'B': /* arrow down */
if((inst->historyRead != inst->historyEnd))
{
history_storeCmd(inst);
if(true == inst->historyReadUp)
{
history_navigate(inst, 1);
}
inst->historyReadUp = false;
history_navigate(inst, 1);
utils_clearInput(inst);
history_restoreCmd(inst);
}
break;
case 'C': /* arrow right */
utils_forwardCursor(inst, 1u);
break;
case 'D': /* arrow left */
utils_rewindCursor(inst, 1u);
break;
default:
/** ignore unknown escape */
ret = SHELLMATTA_USE_FAULT;
break;
}
}
return ret;
}
/**
* @brief handles a ANSI escape sequence to be able to react to some
* special keys
* @param[in] inst pointer to a shellmatta instance
* @param[in] data new received character of the escape sequence
*/
void escape_handleSequence(shellmatta_instance_t *inst, char data)
{
switch (inst->escapeCounter)
{
case 1u:
inst->escapeChars[inst->escapeCounter - 1] = data;
inst->escapeCounter ++;
break;
case 2u:
inst->escapeChars[inst->escapeCounter - 1] = data;
/** -# check if an arrow key was pressed */
if(SHELLMATTA_OK == escape_processArrowKeys(inst))
{
inst->escapeCounter = 0u;
}
/** -# check if end was pressed */
else if ( (0x4f == inst->escapeChars[0])
&& (0x46 == inst->escapeChars[1]))
{
utils_forwardCursor(inst, inst->inputCount - inst->cursor);
inst->escapeCounter = 0u;
}
/** -# if the highest bit is not set this is usually not the end of the
* sequence - so we go on */
else if(0u == (0x40 & data))
{
inst->escapeCounter ++;
}
else
{
inst->escapeCounter = 0u;
}
break;
case 3u:
/** -# check if delete was pressed */
inst->escapeChars[inst->escapeCounter - 1] = data;
if( (0x5b == inst->escapeChars[0])
&& (0x33 == inst->escapeChars[1])
&& (0x7e == inst->escapeChars[2]))
{
utils_removeChars(inst, 1u, false);
inst->escapeCounter = 0u;
}
/** -# check if pos1 was pressed */
else if ( (0x5bu == inst->escapeChars[0])
&& (0x31u == inst->escapeChars[1])
&& (0x7eu == inst->escapeChars[2]))
{
utils_rewindCursor(inst, inst->cursor);
inst->escapeCounter = 0u;
}
else if(0u == (0x40u & data))
{
inst->escapeCounter ++;
}
else
{
inst->escapeCounter = 0u;
}
break;
default:
inst->escapeCounter = 0u;
break;
}
}
/**
* @}
*/

31
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@ -0,0 +1,31 @@
/*
* Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* @file shellmatta_escape.h
* @brief functions to parse and generate escape sequences
* @author Stefan Strobel <stefan.strobel@shimatta.net>
*/
/**
* @addtogroup shellmatta_escape
* @{
*/
#ifndef _SHELLMATTA_ESCAPE_H_
#define _SHELLMATTA_ESCAPE_H_
#include "shellmatta.h"
#include <stdint.h>
shellmatta_retCode_t escape_processArrowKeys(shellmatta_instance_t *inst);
void escape_handleSequence(shellmatta_instance_t *inst, char data);
#endif
/** @} */

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@ -0,0 +1,232 @@
/*
* Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* @file shellmatta_history.c
* @brief history buffer functions of shellmatta
* @author Stefan Strobel <stefan.strobel@shimatta.net>
*/
/**
* @addtogroup shellmatta_history
* @{
*/
#include "shellmatta_history.h"
#include "shellmatta.h"
#include "shellmatta_utils.h"
/**
* @brief appends a byte to the history ring stack buffer
* @param[in] inst pointer to a shellmatta instance
* @param[in] byte byte to append to the history buffer
*/
static void appendHistoryByte(shellmatta_instance_t *inst, char byte)
{
/** -# calculate the new history buffer index */
inst->historyEnd ++;
if(inst->historyEnd >= inst->historyBufferSize)
{
inst->historyEnd = 0u;
}
/** -# append the byte */
inst->historyBuffer[inst->historyEnd] = byte;
/** -# check if the we overwrite an existing stored command */
if(inst->historyEnd == inst->historyStart)
{
/** -# move the start pointer to the next termination (0) */
do
{
inst->historyStart ++;
if(inst->historyStart >= inst->historyBufferSize)
{
inst->historyStart = 0u;
}
}while(0u != inst->historyBuffer[inst->historyStart]);
}
}
/**
* @brief reads a byte from the history buffer and decreases the read index
* @param[in] inst pointer to a shellmatta instance
* @param[out] byte pointer to a char where the read out byte will be stored
* @return
*/
static bool getHistoryByte(shellmatta_instance_t *inst, char *byte)
{
bool ret = false;
/** -# check if we have reached the end of the buffer already */
if(inst->historyRead != inst->historyStart)
{
/** -# read out one byte and decrease the read index */
*byte = inst->historyBuffer[inst->historyRead];
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
ret = true;
}
return ret;
}
bool history_navigate(shellmatta_instance_t *inst, int32_t cnt)
{
bool ret = true;
uint32_t tempReadIdx = 0u;
while((cnt > 0) && (true == ret))
{
if(inst->historyRead != inst->historyEnd)
{
inst->historyRead ++;
}
while(inst->historyRead != inst->historyEnd)
{
inst->historyRead ++;
if(inst->historyRead >= inst->historyBufferSize)
{
inst->historyRead = 0u;
}
if( (inst->historyRead != inst->historyEnd)
&& (0u == inst->historyBuffer[inst->historyRead]))
{
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
cnt -= 1;
break;
}
}
if(inst->historyRead == inst->historyEnd)
{
ret = false;
}
}
while((cnt < 0) && (true == ret))
{
tempReadIdx = inst->historyRead;
while(inst->historyRead != inst->historyStart)
{
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
if( (inst->historyRead != inst->historyStart)
&& (0u == inst->historyBuffer[inst->historyRead]))
{
if(0u == inst->historyRead)
{
inst->historyRead = inst->historyBufferSize;
}
inst->historyRead --;
cnt += 1;
break;
}
}
if(inst->historyRead == inst->historyStart)
{
inst->historyRead = tempReadIdx;
inst->historyReadUp = false;
ret = false;
}
}
return ret;
}
/**
* @brief stores the current command from the instances buffer into the
* history buffer
* @param[in] inst pointer to a shellmatta instance
*/
void history_storeCmd(shellmatta_instance_t *inst)
{
uint32_t i;
/** -# check if we have enough room for the command in the history buffer
* and there is a new command to be stored */
if( (inst->historyBufferSize > inst->inputCount)
&& (0u != inst->inputCount)
&& (true == inst->dirty))
{
/** -# append the command termination */
appendHistoryByte(inst, 0u);
/** -# append the command byte wise in reverse direction */
for(i = inst->inputCount; i > 0u; i --)
{
appendHistoryByte(inst, inst->buffer[i - 1u]);
}
}
/** -# remove the dirty flag - everything is nice and saved */
inst->dirty = false;
}
/**
* @brief navigates in the history buffer by the given number of commands
* @param[in] inst pointer to a shellmatta instance
* @param[in] cnt direction and count to navigate
* @return
*/
/**
* @brief restores the command from the history buffer where the read
* index points on
* @param[in] inst pointer to a shellmatta instance
*/
void history_restoreCmd(shellmatta_instance_t *inst)
{
char byte;
bool ret = true;
ret = getHistoryByte(inst, &byte);
while((ret == true) && (byte != 0u))
{
inst->buffer[inst->inputCount] = byte;
inst->inputCount ++;
inst->cursor ++;
ret = getHistoryByte(inst, &byte);
}
utils_writeEcho(inst, inst->buffer, inst->inputCount);
history_navigate(inst, 1);
inst->dirty = false;
}
/**
* @brief resets the history buffer pointers to show to the most recent
* command again
* @param[in] inst pointer to a shellmatta instance
*/
void history_reset(shellmatta_instance_t *inst)
{
inst->historyRead = inst->historyEnd;
inst->historyReadUp = true;
}
/**
* @}
*/

33
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@ -0,0 +1,33 @@
/*
* Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* @file shellmatta_history.h
* @brief history buffer functions of shellmatta
* @author Stefan Strobel <stefan.strobel@shimatta.net>
*/
/**
* @addtogroup shellmatta_api
* @{
*/
#ifndef _SHELLMATTA_HISTORY_H_
#define _SHELLMATTA_HISTORY_H_
#include "shellmatta.h"
#include <stdint.h>
bool history_navigate(shellmatta_instance_t *inst, int32_t cnt);
void history_storeCmd(shellmatta_instance_t *inst);
void history_restoreCmd(shellmatta_instance_t *inst);
void history_reset(shellmatta_instance_t *inst);
#endif
/** @} */

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@ -0,0 +1,346 @@
/*
* Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* @file shellmatta_utils.c
* @brief util/helper functions of shellmatta
* @author Stefan Strobel <stefan.strobel@shimatta.net>
*/
/**
* @addtogroup shellmatta_utils
* @{
*/
#include "shellmatta_utils.h"
#include "shellmatta.h"
#include <string.h>
/**
* @brief function to write an echo to the output depending on
* the echo enabled state of the instance
* @param[in] inst pointer to a shellmatta instance
* @param[in] data pointer to the data so send
* @param[in] length length of the data to send (in byte)
*/
void utils_writeEcho( shellmatta_instance_t *inst,
const char *data,
uint32_t length)
{
if(true == inst->echoEnabled)
{
inst->write(data, length);
}
}
/**
* @brief itoa like function to convert int to an ascii string
* @warning you have to provide a large enough buffer
* @param[in] value
* @param[in,out] buffer
* @param[in] base
* @return number of bytes in string
*/
uint32_t utils_shellItoa(int32_t value, char *buffer, uint32_t base)
{
char tempBuffer[34u];
uint32_t i;
uint32_t bufferIdx = 0u;
char digitValue;
/** -# check the base for plausibility */
if((2 <= base) && (16 >= base))
{
/** -# check for sign */
if(0 > value)
{
value = value * (-1);
buffer[0u] = '-';
bufferIdx += 1u;
}
/** -# loop through all digits in reverse order */
i = 0u;
do
{
digitValue = (char) (value % base);
tempBuffer[i] = (digitValue < 10u) ? ('0' + digitValue) : (('A' - 10) + digitValue);
value /= base;
i ++;
}while(value > 0);
/** -# store the string in the correct order onto the buffer */
while(i > 0u)
{
buffer[bufferIdx] = tempBuffer[i - 1u];
i --;
bufferIdx ++;
}
}
return bufferIdx;
}
/**
* @brief tells the terminal to save the current cursor position
* @param[in] inst pointer to shellmatta instance
*/
void utils_saveCursorPos(shellmatta_instance_t *inst)
{
utils_writeEcho(inst, "\e[s", 3u);
}
/**
* @brief tells the terminal to restore the saved cursor position
* @param[in] inst pointer to shellmatta instance
*/
void utils_restoreCursorPos(shellmatta_instance_t *inst)
{
utils_writeEcho(inst, "\e[u", 3u);
}
/**
* @brief tells the terminal to erase the line on the right side of the
* cursor
* @param[in] inst pointer to shellmatta instance
*/
void utils_eraseLine(shellmatta_instance_t *inst)
{
utils_writeEcho(inst, "\e[K", 3u);
}
/**
* @brief moves the cursor back by the given amoung of characters
* @param[in] inst pointer to shellmatta instance
* @param[in] length number of characters to rewind
*/
void utils_rewindCursor(shellmatta_instance_t *inst, uint32_t length)
{
char terminalCmd[16];
size_t size;
length = SHELLMATTA_MIN (length, inst->cursor);
if(length > 0u)
{
terminalCmd[0] = '\e';
terminalCmd[1] = '[';
size = 2u + utils_shellItoa(length, &terminalCmd[2], 10);
terminalCmd[size] = 'D';
utils_writeEcho(inst, terminalCmd, size + 1u);
inst->cursor -= length;
}
}
/**
* @brief moves the cursor forward by the given amoung of characters
* @param[in] inst pointer to shellmatta instance
* @param[in] length number of characters to move forward
*/
void utils_forwardCursor(shellmatta_instance_t *inst, uint32_t length)
{
char terminalCmd[16];
size_t size;
length = SHELLMATTA_MAX (length, (inst->inputCount - inst->cursor));
if (length > 0u)
{
terminalCmd[0] = '\e';
terminalCmd[1] = '[';
size = 2u + utils_shellItoa(length, &terminalCmd[2], 10);
terminalCmd[size] = 'C';
utils_writeEcho(inst, terminalCmd, size + 1u);
inst->cursor += length;
}
}
/**
* @brief inserts the given amount of characters at the cursor position
* @param[in] inst pointer to shellmatta instance
* @param[in] data pointer to the data to be inserted
* @param[in] length length of the data to be inserted
*/
void utils_insertChars( shellmatta_instance_t *inst,
char *data,
uint32_t length)
{
if(0u != length)
{
/** -# check if we have to move chars in the buffer */
if( (inst->cursor != inst->inputCount)
&& (SHELLMATTA_MODE_INSERT == inst->mode))
{
/** -# move the existing chars */
for ( uint32_t i = inst->inputCount;
i > inst->cursor;
i --)
{
inst->buffer[i + length - 1] = inst->buffer[i - 1];
}
/** -# store and print the new chars */
memcpy(&(inst->buffer[inst->cursor]), data, length);
utils_writeEcho(inst, data, length);
/** -# print the other chars and restore the cursor to this position */
utils_eraseLine(inst);
utils_saveCursorPos(inst);
utils_writeEcho( inst,
&(inst->buffer[inst->cursor + length]),
inst->inputCount - inst->cursor);
utils_restoreCursorPos(inst);
}
/** -# just overwrite/append the chars */
else
{
memcpy(&(inst->buffer[inst->cursor]), data, length);
utils_writeEcho(inst, data, length);
}
inst->inputCount += length;
inst->cursor += length;
}
}
/**
* @brief removes the given amount of characters from the current cursor
* position
* @param[in] inst pointer to a shellmatta instance
* @param[in] length number of characters to remove
* @param[in] backspace remove characters left of the cursor
*/
void utils_removeChars( shellmatta_instance_t *inst,
uint32_t length,
bool backspace)
{
if(0u != length)
{
/** -# rewind the cursor in case of backspace */
if(true == backspace)
{
length = SHELLMATTA_MIN (length, inst->cursor);
utils_rewindCursor(inst, length);
}
else
{
length = SHELLMATTA_MIN (length, inst->inputCount - inst->cursor);
}
/** -# delete the char at the cursor position */
for ( uint32_t i = inst->cursor;
i < (inst->inputCount - length);
i++)
{
inst->buffer[i] = inst->buffer[i + length];
}
/** -# print the rest of the line again */
utils_eraseLine(inst);
utils_saveCursorPos(inst);
utils_writeEcho( inst,
&(inst->buffer[inst->cursor]),
(inst->inputCount - inst->cursor - length));
utils_restoreCursorPos(inst);
inst->inputCount -= length;
}
}
/**
* @brief clears the input buffer and removes the currend command from
* the terminal output
* @param[in] inst pointer to a shellmatta instance
*/
void utils_clearInput(shellmatta_instance_t *inst)
{
utils_rewindCursor(inst, inst->cursor);
utils_eraseLine(inst);
inst->inputCount = 0u;
inst->dirty = false;
}
/**
* @brief prints all possible commands with description and usage
* @param[in] handle handle shellmatta instance handle
* @param[in] arguments not used here
* @param[in] length not used here
* @return #SHELLMATTA_OK
* #SHELLMATTA_ERROR (buffer overflow)
*/
static shellmatta_retCode_t helpCmdFct(shellmatta_handle_t handle, const char *arguments, uint32_t length)
{
shellmatta_retCode_t ret = SHELLMATTA_OK;
shellmatta_instance_t *inst = (shellmatta_instance_t*) handle;
shellmatta_cmd_t *cmd = inst->cmdList;
size_t maxCmdLen = 0u;
size_t maxCmdAliasLen = 0u;
size_t maxCmdHelpLen = 0u;
size_t cmdLen = 0u;
size_t cmdAliasLen = 0u;
size_t cmdHelpLen = 0u;
uint32_t tabCnt = 0u;
static const char tabBuffer[] = { ' ', ' ', ' ', ' ',
' ', ' ', ' ', ' ',
' ', ' ', ' ', ' ',
' ', ' ', ' ', ' '};
/** -# loop through all commands to determine the lengths of each cmd */
while(NULL != cmd)
{
maxCmdLen = SHELLMATTA_MAX(maxCmdLen, strlen(cmd->cmd));
maxCmdAliasLen = SHELLMATTA_MAX(maxCmdAliasLen, strlen(cmd->cmdAlias));
maxCmdHelpLen = SHELLMATTA_MAX(maxCmdHelpLen, strlen(cmd->helpText));
cmd = cmd->next;
}
/** -# loop through all commands and print all possible information */
cmd = inst->cmdList;
while(NULL != cmd)
{
/** -# determine the length of each field to add padding */
cmdLen = strlen(cmd->cmd);
cmdAliasLen = strlen(cmd->cmdAlias);
cmdHelpLen = strlen(cmd->helpText);
inst->write(cmd->cmd, strlen(cmd->cmd));
tabCnt = (maxCmdLen - cmdLen) + 2u;
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
inst->write(cmd->cmdAlias, strlen(cmd->cmdAlias));
tabCnt = (maxCmdAliasLen - cmdAliasLen) + 2u;
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
inst->write(cmd->helpText, strlen(cmd->helpText));
tabCnt = (maxCmdHelpLen - cmdHelpLen) + 2u;
SHELLMATTA_PRINT_BUFFER(tabBuffer, tabCnt, inst->write);
inst->write(cmd->usageText, strlen(cmd->usageText));
inst->write("\r\n", 2u);
cmd = cmd->next;
}
(void)arguments;
(void)length;
return ret;
}
shellmatta_cmd_t helpCmd = {"help", "h", "Print this help text", "help", helpCmdFct, NULL};
/**
* @brief terminates an input and prints the prompt again
* @param[in] inst pointer to a shellmatta instance
*/
void utils_terminateInput(shellmatta_instance_t *inst)
{
inst->inputCount = 0u;
inst->cursor = 0u;
inst->write("\r\n", 2u);
inst->write(inst->prompt, strlen(inst->prompt));
}
/**
* @}
*/

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/*
* Copyright (c) 2019 Stefan Strobel <stefan.strobel@shimatta.net>
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* @file shellmatta_utils.h
* @brief util/helper functions of shellmatta
* @author Stefan Strobel <stefan.strobel@shimatta.net>
*/
/**
* @addtogroup shellmatta_utils
* @{
*/
#ifndef _SHELLMATTA_UTILS_H_
#define _SHELLMATTA_UTILS_H_
#include "shellmatta.h"
#include <stdint.h>
#define SHELLMATTA_MIN(a,b) (((a) > (b)) ? (b) : (a))
#define SHELLMATTA_MAX(a,b) (((a) < (b)) ? (b) : (a))
#define SHELLMATTA_PRINT_BUFFER(buffer,cnt,fct) \
while((cnt) > sizeof((buffer))) \
{ \
(cnt) -= sizeof((buffer)); \
(fct)((buffer), sizeof((buffer))); \
} \
if((cnt) != 0u) \
{ \
(fct)((buffer), (cnt)); \
}
extern shellmatta_cmd_t helpCmd;
#define SHELLMATTA_MAGIC 0x5101E110u
#ifndef SHELLMATTA_OUTPUT_BUFFER_SIZE
#define SHELLMATTA_OUTPUT_BUFFER_SIZE 128u
#endif
void utils_writeEcho( shellmatta_instance_t *inst,
const char *data,
uint32_t length);
uint32_t utils_shellItoa(int32_t value, char *buffer, uint32_t base);
void utils_saveCursorPos(shellmatta_instance_t *inst);
void utils_restoreCursorPos(shellmatta_instance_t *inst);
void utils_eraseLine(shellmatta_instance_t *inst);
void utils_rewindCursor(shellmatta_instance_t *inst, uint32_t length);
void utils_forwardCursor(shellmatta_instance_t *inst, uint32_t length);
void utils_insertChars( shellmatta_instance_t *inst,
char *data,
uint32_t length);
void utils_removeChars( shellmatta_instance_t *inst,
uint32_t length,
bool backspace);
void utils_clearInput(shellmatta_instance_t *inst);
void utils_terminateInput(shellmatta_instance_t *inst);
#endif
/** @} */