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Shell: Implement support for terminal clearing with ^L.

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Make LineEditor::get_line() responsible for printing the prompt. That way
we can re-prompt after clearing the screen on ^L.

This makes the Serenity Terminal feel a little bit more like home :^)
This commit is contained in:
Andreas Kling 2019-07-19 20:01:46 +02:00
parent 2d4d465206
commit 253e391bfc
3 changed files with 23 additions and 11 deletions
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15
Shell/LineEditor.cpp
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@ -37,8 +37,11 @@ void LineEditor::append(const String& string)
m_cursor = m_buffer.size();
}
String LineEditor::get_line()
String LineEditor::get_line(const String& prompt)
{
fputs(prompt.characters(), stdout);
fflush(stdout);
m_history_cursor = m_history.size();
m_cursor = 0;
for (;;) {
@ -190,6 +193,16 @@ String LineEditor::get_line()
do_backspace();
continue;
}
if (ch == 0xc) { // ^L
printf("\033[3J\033[H\033[2J"); // Clear screen.
fputs(prompt.characters(), stdout);
for (int i = 0; i < m_buffer.size(); ++i)
fputc(m_buffer[i], stdout);
if (m_cursor < m_buffer.size())
printf("\033[%dD", m_buffer.size() - m_cursor); // Move cursor N steps left.
fflush(stdout);
continue;
}
putchar(ch);
fflush(stdout);
if (ch == '\n') {