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/*
* wxCommandHistory.cpp wx logo terminal command history module
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
*/
#include <cstddef>
#include <cstring>
#include "wxCommandHistory.h"
char * clone_string_segment(const char *src_string, const int len);
wxCommandHistory::wxCommandHistory(const int history_size) {
// Set up the buffer for storing commands.
m_history_size = history_size;
m_command_history = new char *[m_history_size];
memset(m_command_history, (int)NULL, sizeof(char *) * m_history_size);
m_history_in_index = m_history_out_index = 0;
// Set up the scratch space for storing the current working command.
m_working_command = NULL;
m_history_moves = 0;
}
wxCommandHistory::~wxCommandHistory() {
for (int i=0; i<m_history_size; i++) {
if (m_command_history[i] != NULL) {
delete[] m_command_history[i];
}
}
delete[] m_command_history;
if (m_working_command != NULL) {
delete[] m_working_command;
}
}
void wxCommandHistory::handle_command_entered(const char *input_buffer, const int command_len) {
// Clear the current working command scratch space.
m_history_moves = 0;
if (m_working_command != NULL) {
delete[] m_working_command;
m_working_command = NULL;
}
// Guard against storing empty commands.
if (command_len < 1) {
return;
}
// Store the command in the history.
m_command_history[m_history_in_index] = clone_string_segment(input_buffer, command_len);
m_history_in_index++;
// Handle buffer wraparound.
if (m_history_in_index >= m_history_size) {
m_history_in_index = 0;
}
// Free up space for the next command if needed.
if (m_command_history[m_history_in_index] != NULL) {
delete[] m_command_history[m_history_in_index];
m_command_history[m_history_in_index] = NULL;
}
// Update the output index.
m_history_out_index = m_history_in_index;
}
char * wxCommandHistory::handle_previous(const char *input_buffer, const int command_len) {
maybe_store_working_command(input_buffer, command_len);
// If at the beginning of history navigation, and a scratch command has been stored, return it.
if (m_working_command != NULL && m_history_moves == 0) {
m_history_moves++;
return m_working_command;
}
int old_history_out_index = m_history_out_index;
m_history_out_index--;
// Handle buffer wraparound.
if (m_history_out_index < 0) {
m_history_out_index = m_history_size - 1;
}
if (m_command_history[m_history_out_index] != NULL) {
// Return the command from history.
m_history_moves++;
return m_command_history[m_history_out_index];
} else {
// There is no more history, restore the history out index.
m_history_out_index = old_history_out_index;
return NULL;
}
}
char * wxCommandHistory::handle_next(const char *input_buffer, const int command_len) {
maybe_store_working_command(input_buffer, command_len);
if (m_command_history[m_history_out_index] != NULL) {
m_history_out_index++;
}
// Handle buffer wraparound.
if (m_history_out_index >= m_history_size) {
m_history_out_index = 0;
}
if (m_history_moves > 0) {
m_history_moves--;
}
// If at the beginning of history navigation, and a scratch command has been stored, return it.
if (m_command_history[m_history_out_index] == NULL) {
if (m_working_command != NULL && m_history_moves == 1) {
return m_working_command;
}
}
// Return the command or NULL to signify there are no more commands in history.
return m_command_history[m_history_out_index];
}
void wxCommandHistory::maybe_store_working_command(const char *input_buffer, const int command_len) {
// Guard against storing empty commands.
if (command_len < 1) {
return;
}
if (m_history_moves == 0 || (m_history_moves == 1 && m_working_command != NULL)) {
// Store the current working command in the command scratch space.
if (m_working_command != NULL) {
delete[] m_working_command;
}
m_working_command = clone_string_segment(input_buffer, command_len);
// Only increment when first saving a working command, leave move count
// as-is when updating the command scratch space.
if (m_history_moves == 0) {
m_history_moves++;
}
}
}
char * clone_string_segment(const char *src_string, const int len) {
char *cloned_string = new char[len + 1];
for(int i = 0; i < len; i++) {
cloned_string[i] = src_string[i];
}
cloned_string[len] = '\0';
return cloned_string;
}
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