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Shell: Move line editing to a separate class.

Browse source 
To be clear, there isn't really any line editing yet. But there is
going to be, so let's have it in its own class.
This commit is contained in:
Andreas Kling 2019-05-07 01:39:10 +02:00
parent fe73543d41
commit ba7364b43b
6 changed files with 167 additions and 100 deletions
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94
Shell/LineEditor.cpp Normal file
View file

@ -0,0 +1,94 @@
#include "LineEditor.h"
#include "GlobalState.h"
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
LineEditor::LineEditor()
{
}
LineEditor::~LineEditor()
{
}
void LineEditor::add_to_history(const String& line)
{
if ((m_history.size() + 1) > m_history_capacity)
m_history.take_first();
m_history.append(line);
}
String LineEditor::get_line()
{
for (;;) {
char keybuf[16];
ssize_t nread = read(0, keybuf, sizeof(keybuf));
// FIXME: exit()ing here is a bit off. Should communicate failure to caller somehow instead.
if (nread == 0)
exit(0);
if (nread < 0) {
if (errno == EINTR) {
if (g.was_interrupted) {
if (!m_buffer.is_empty())
printf("^C");
}
g.was_interrupted = false;
m_buffer.clear();
putchar('\n');
return String::empty();
} else {
perror("read failed");
// FIXME: exit()ing here is a bit off. Should communicate failure to caller somehow instead.
exit(2);
}
}
for (ssize_t i = 0; i < nread; ++i) {
char ch = keybuf[i];
if (ch == 0)
continue;
if (ch == 8 || ch == g.termios.c_cc[VERASE]) {
if (m_buffer.is_empty())
continue;
m_buffer.take_last();
putchar(8);
fflush(stdout);
continue;
}
if (ch == g.termios.c_cc[VWERASE]) {
bool has_seen_nonspace = false;
while (!m_buffer.is_empty()) {
if (isspace(m_buffer.last())) {
if (has_seen_nonspace)
break;
} else {
has_seen_nonspace = true;
}
putchar(0x8);
m_buffer.take_last();
}
fflush(stdout);
continue;
}
if (ch == g.termios.c_cc[VKILL]) {
if (m_buffer.is_empty())
continue;
for (int i = 0; i < m_buffer.size(); ++i)
putchar(0x8);
m_buffer.clear();
fflush(stdout);
continue;
}
putchar(ch);
fflush(stdout);
if (ch != '\n') {
m_buffer.append(ch);
} else {
auto string = String::copy(m_buffer);
m_buffer.clear();
return string;
}
}
}
}