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Userspace: Shell now uses PS1 as prompt if set

This commit is contained in:
Bananymous 2023-06-12 00:45:47 +03:00
parent 30ac046232
commit e9cb844c28
1 changed files with 88 additions and 9 deletions
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97
userspace/Shell/main.cpp
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@ -45,6 +45,33 @@ int execute_command(BAN::StringView command)
{
exit(0);
}
else if (args.front() == "export"sv)
{
bool first = false;
for (const char* arg : args)
{
if (first)
{
first = false;
continue;
}
const char* eq_sign = strchr(arg, '=');
if (eq_sign == nullptr)
continue;
char name[128];
if (eq_sign - arg >= sizeof(name))
continue;
memcpy(name, arg, eq_sign - arg);
name[eq_sign - arg] = '\0';
char value[128];
strncpy(value, eq_sign + 1, sizeof(value));
setenv(name, value, true);
}
}
else
{
pid_t pid = fork();
@ -90,6 +117,59 @@ int character_length(BAN::StringView prompt)
return length;
}
BAN::String get_prompt()
{
const char* raw_prompt = getenv("PS1");
if (raw_prompt == nullptr)
raw_prompt = "\e[32muser@host\e[m:\e[34m/\e[m$ ";
BAN::String prompt;
for (int i = 0; raw_prompt[i]; i++)
{
char ch = raw_prompt[i];
if (ch == '\\')
{
switch (raw_prompt[++i])
{
case 'e':
MUST(prompt.push_back('\e'));
break;
case 'n':
MUST(prompt.push_back('\n'));
break;
case '\\':
MUST(prompt.push_back('\\'));
break;
case '\0':
MUST(prompt.push_back('\\'));
break;
default:
MUST(prompt.push_back('\\'));
MUST(prompt.push_back(*raw_prompt));
break;
}
}
else
{
MUST(prompt.push_back(ch));
}
}
return prompt;
}
int prompt_length()
{
return character_length(get_prompt());
}
void print_prompt()
{
auto prompt = get_prompt();
fprintf(stdout, "%.*s", prompt.size(), prompt.data());
fflush(stdout);
}
int main(int argc, char** argv)
{
tcgetattr(0, &old_termios);
@ -105,9 +185,7 @@ int main(int argc, char** argv)
int waiting_utf8 = 0;
BAN::String prompt("\e[32muser@host\e[m:\e[34m/\e[m$ "sv);
fprintf(stdout, "%s", prompt.data());
fflush(stdout);
print_prompt();
while (true)
{
@ -154,16 +232,18 @@ int main(int argc, char** argv)
fread(&ch, 1, sizeof(char), stdin);
switch (ch)
{
case 'A': if (index > 0) { index--; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", character_length(prompt) + 1, buffers[index].data()); fflush(stdout); } break;
case 'B': if (index < buffers.size() - 1) { index++; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", character_length(prompt) + 1, buffers[index].data()); fflush(stdout); } break;
case 'A': if (index > 0) { index--; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", prompt_length() + 1, buffers[index].data()); fflush(stdout); } break;
case 'B': if (index < buffers.size() - 1) { index++; col = buffers[index].size(); fprintf(stdout, "\e[%dG%s\e[K", prompt_length() + 1, buffers[index].data()); fflush(stdout); } break;
case 'C': if (col < buffers[index].size()) { col++; while ((buffers[index][col - 1] & 0xC0) == 0x80) col++; fprintf(stdout, "\e[C"); fflush(stdout); } break;
case 'D': if (col > 0) { while ((buffers[index][col - 1] & 0xC0) == 0x80) col--; col--; fprintf(stdout, "\e[D"); fflush(stdout); } break;
}
break;
case '\x0C': // ^L
{
int x = character_length(prompt) + character_length(buffers[index].sv().substring(col)) + 1;
fprintf(stdout, "\e[H\e[J%s%s\e[u\e[1;%dH", prompt.data(), buffers[index].data(), x);
int x = prompt_length() + character_length(buffers[index].sv().substring(col)) + 1;
fprintf(stdout, "\e[H\e[J");
print_prompt();
fprintf(stdout, "%s\e[u\e[1;%dH", buffers[index].data(), x);
fflush(stdout);
break;
}
@ -188,8 +268,7 @@ int main(int argc, char** argv)
buffers = history;
MUST(buffers.emplace_back(""sv));
}
fprintf(stdout, "%s", prompt.data());
fflush(stdout);
print_prompt();
index = buffers.size() - 1;
col = 0;
break;