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https://github.com/justinian/jsix.git
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Justin C. Miller
da9041823b
Now used by the 6s shell to enable backspace, return, etc. No cursor movement yet or anything complex.
138 lines
2.9 KiB
C++
138 lines
2.9 KiB
C++
#include <edit/line.h>
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#include <j6/memutils.h>
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#include <j6/syslog.hh>
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namespace edit {
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static constexpr char ESC = '\x1b';
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static constexpr char BACKSPACE = '\x08';
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static constexpr char DEL = '\x7f';
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static const char init_line[] = "\x1b[999D\x1b[K";
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static const size_t init_line_len = sizeof(init_line) - 1;
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static const char get_pos[] = "\x1b[n";
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static const size_t get_pos_len = sizeof(get_pos) - 1;
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static const char backspace[] = "\x1b[D\x1b[K";
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static const size_t backspace_len = sizeof(backspace) - 1;
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line::line(const char *prompt, size_t prompt_len) :
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m_out {0}
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{
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m_buf = new char [1024];
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memcpy(m_buf, init_line, init_line_len);
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m_in = init_line_len;
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if (prompt && prompt_len) {
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memcpy(m_buf + m_in, prompt, prompt_len);
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m_in += prompt_len;
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}
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m_prefix = m_in;
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m_tmp_out = get_pos;
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m_tmp_out_len = get_pos_len;
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}
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line::~line()
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{
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delete [] m_buf;
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}
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size_t
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line::input(char const *data, size_t len)
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{
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j6::syslog(j6::logs::app, j6::log_level::spam, "Line edit got %d bytes input", len);
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size_t i = 0;
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size_t sub_len = 0;
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while (i < len) {
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switch (data[i]) {
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case ESC:
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sub_len = parse_command(data + i, len - i);
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if (!sub_len)
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return i; // Not yet enough data
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i += sub_len;
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break;
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case BACKSPACE:
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case DEL:
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if (m_in > m_prefix) {
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--m_in;
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if (m_out > m_in)
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m_out = m_in;
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m_tmp_out = backspace;
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m_tmp_out_len = backspace_len;
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}
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++i;
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break;
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case '\r':
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m_out = 0;
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m_in = m_prefix;
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m_tmp_out = "\n";
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m_tmp_out_len = 1;
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++i;
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break;
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default:
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m_buf[m_in++] = data[i++];
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break;
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}
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}
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return i;
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}
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size_t
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line::output(char const **data)
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{
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if (m_tmp_out) {
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char const *out = m_tmp_out;
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m_tmp_out = nullptr;
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size_t len = m_tmp_out_len;
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m_tmp_out_len = 0;
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*data = out;
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j6::syslog(j6::logs::app, j6::log_level::spam, "Line edit sending %d bytes alt output", len);
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return len;
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}
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*data = (m_buf + m_out);
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size_t len = m_in - m_out;
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m_out = m_in;
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j6::syslog(j6::logs::app, j6::log_level::spam, "Line edit sending %d bytes output", len);
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return len;
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}
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size_t
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line::parse_command(char const *data, size_t len)
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{
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size_t i = 2;
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char buf[60];
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char *p = buf;
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while (i < len) {
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if ((data[i] >= '0' && data[i] <= '9') || data[i] == ';') {
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*p++ = data[i];
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} else {
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*p++ = data[i];
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*p = 0;
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j6::syslog(j6::logs::app, j6::log_level::verbose,
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"line edit got command: ESC[%s", buf);
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return i;
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}
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++i;
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}
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return 0;
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}
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} // namespace line
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