mhu/shellmatta
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added basic heredoc function

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Some things are broken:
navigation in multiline inputs
history buffer for multiline inputs
some things not been noticed yet
This commit is contained in:
prozessorkern 2019-07-29 01:30:16 +02:00
parent fc8a34dd1c
commit 280e512746
4 changed files with 126 additions and 44 deletions
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5
api/shellmatta.h
View File

@ -91,6 +91,7 @@ typedef struct
char *buffer; /**< input buffer */
uint32_t bufferSize; /**< size of the input buffer */
uint32_t inputCount; /**< offset of the current write operation */
uint32_t lastNewlineIdx; /**< index of the lest newline */
uint32_t cursor; /**< offset where the cursor is at */
char *historyBuffer; /**< buffer to store the last commands */
uint32_t historyBufferSize; /**< size of the history buffer */
@ -100,7 +101,9 @@ typedef struct
bool historyReadUp; /**< flag to show the last history dir */
uint32_t tabCounter; /**< counts the tabulator key presses */
uint32_t escapeCounter; /**< counts the characters of an escape seq */
char escapeChars[4]; /**< buffer to save the escape characters */
char escapeChars[4u]; /**< buffer to save the escape characters */
char hereDelimiter[16u]; /**< heredoc delimiter */
uint32_t hereLength; /**< length of the heredoc delimiter */
bool echoEnabled; /**< if true the input is printed */
bool dirty; /**< dirty flag to show changes */
const char *prompt; /**< prompt is printed after every command */

5
example/main.c
View File

@ -22,8 +22,7 @@ static bool exitRequest = false;
int f;
shellmatta_handle_t handle;
void
set_blocking (int fd, int should_block)
void set_blocking (int fd, int should_block)
{
struct termios tty;
memset (&tty, 0, sizeof tty);
@ -80,7 +79,7 @@ int main(void)
static char historyBuffer[4096];
static shellmatta_instance_t instance;
f = open("/dev/pts/3", O_RDWR | O_SYNC);
f = open("/dev/pts/1", O_RDWR | O_SYNC);
if (f < 0)
{

78
src/shellmatta.c
View File

@ -74,6 +74,7 @@ shellmatta_retCode_t shellmatta_doInit(
inst->buffer = buffer;
inst->bufferSize = bufferSize;
inst->inputCount = 0u;
inst->lastNewlineIdx = 0u;
inst->cursor = 0u;
inst->historyBuffer = historyBuffer;
inst->historyBufferSize = historyBufferSize;
@ -87,6 +88,7 @@ shellmatta_retCode_t shellmatta_doInit(
inst->dirty = false;
inst->tabCounter = 0u;
inst->escapeCounter = 0u;
inst->hereLength = 0u;
inst->mode = SHELLMATTA_MODE_INSERT;
inst->cmdList = &helpCmd;
inst->cmdListIsConst = false;
@ -194,6 +196,7 @@ shellmatta_retCode_t shellmatta_processData(shellmatta_handle_t handle,
shellmatta_cmd_t *cmd;
uint8_t cmdExecuted = 0u;
uint32_t cmdLen;
char *tempString;
shellmatta_retCode_t ret = SHELLMATTA_OK;
shellmatta_instance_t *inst = (shellmatta_instance_t*)handle;
@ -217,6 +220,79 @@ shellmatta_retCode_t shellmatta_processData(shellmatta_handle_t handle,
}
/** -# handle return as start of processing the command */
else if ('\r' == *data)
{
if(0u == inst->hereLength)
{
/**
* \dot
* digraph heredocParser {
* start -> wait [ label="<< in first line - store delimiter" ];
* wait -> wait [ label="delimiter not detected" ];
* wait -> end [ label="delimiter found - remove all heredoc stuff and send the input to the command" ];
* }
* \enddot */
/** -# check for heredoc */
tempString = strstr(inst->buffer, "<<");
if(NULL != tempString)
{
/*' -# check if length of heredoc delimiter is valid */
if(inst->inputCount > ((uint32_t)(tempString - inst->buffer) + 2u))
{
inst->hereLength = inst->inputCount - ((uint32_t)(tempString - inst->buffer) + 2u);
if(sizeof(inst->hereDelimiter) < inst->hereLength)
{
inst->write("\r\nHeredoc delimiter too long\r\n", 30u);
inst->inputCount = 0u;
inst->hereLength = 0u;
}
else
{
/** -# store delimiter and remove it from the input buffer */
strncpy(inst->hereDelimiter, &(tempString[2u]), inst->hereLength);
inst->inputCount -= (inst->hereLength + 2u);
inst->cursor = inst->inputCount;
inst->dirty = true;
utils_insertChars(inst, data, 1);
inst->lastNewlineIdx = inst->inputCount;
}
}
else
{
inst->hereLength = 0u;
}
}
}
else
{
tempString = &inst->buffer[inst->lastNewlineIdx];
cmdLen = inst->inputCount - inst->lastNewlineIdx;
/** -# skip newline characters before comparison */
while(('\n' == *tempString) || ('\r' == *tempString))
{
tempString ++;
cmdLen --;
}
if( (inst->hereLength == cmdLen)
&& (0 == strncmp( inst->hereDelimiter,
tempString,
inst->hereLength)))
{
inst->inputCount = inst->lastNewlineIdx;
inst->hereLength = 0u;
}
else
{
inst->lastNewlineIdx = inst->inputCount;
utils_insertChars(inst, data, 1);
}
}
if(0u == inst->hereLength)
{
cmd = inst->cmdList;
inst->buffer[inst->inputCount] = 0u;
@ -269,6 +345,8 @@ shellmatta_retCode_t shellmatta_processData(shellmatta_handle_t handle,
}
utils_terminateInput(inst);
}
}
/** -# check for tabulator key - auto complete */
else if('\t' == *data)
{

2
src/shellmatta_utils.c
View File

@ -336,6 +336,8 @@ shellmatta_cmd_t helpCmd = {"help", "h", "Print this help text", "help", helpCmd
void utils_terminateInput(shellmatta_instance_t *inst)
{
inst->inputCount = 0u;
inst->lastNewlineIdx = 0u;
inst->hereLength = 0u;
inst->cursor = 0u;
inst->write("\r\n", 2u);
inst->write(inst->prompt, strlen(inst->prompt));