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Userland: Add more(1) emulation to less(1)

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This patch also removes the existing implementation of more, as it is
now redundant.
This commit is contained in:
Peter Elliott 2021-07-06 00:30:34 -06:00 • committed by Ali Mohammad Pur
parent 30aa9b837c
commit c6fa2f196a
4 changed files with 38 additions and 65 deletions
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44
Userland/Utilities/less.cpp
View file

@ -5,6 +5,7 @@
*/
#include <AK/Format.h>
#include <AK/LexicalPath.h>
#include <AK/String.h>
#include <AK/StringBuilder.h>
#include <AK/Utf8View.h>
@ -20,7 +21,7 @@
static struct termios g_save;
static struct winsize g_wsize;
static void setup_tty()
static void setup_tty(bool switch_buffer)
{
// Save previous tty settings.
if (tcgetattr(STDOUT_FILENO, &g_save) == -1) {
@ -40,17 +41,21 @@ static void setup_tty()
perror("tcsetattr(3)");
}
// Save cursor and switch to alternate buffer.
out("\e[s\e[?1047h");
if (switch_buffer) {
// Save cursor and switch to alternate buffer.
out("\e[s\e[?1047h");
}
}
static void teardown_tty()
static void teardown_tty(bool switch_buffer)
{
if (tcsetattr(STDOUT_FILENO, TCSAFLUSH, &g_save) == -1) {
perror("tcsetattr(3)");
}
out("\e[?1047l\e[u");
if (switch_buffer) {
out("\e[?1047l\e[u");
}
}
static Vector<String> wrap_line(Utf8View const& string, size_t width)
@ -260,6 +265,7 @@ private:
return off;
}
// FIXME: Don't save scrollback when emulating more.
Vector<String> m_lines;
size_t m_line { 0 };
FILE* m_file;
@ -284,10 +290,19 @@ int main(int argc, char** argv)
{
char const* filename = "-";
char const* prompt = "?f%f :.(line %l)?e (END):.";
bool dont_switch_buffer = false;
bool quit_at_eof = false;
bool emulate_more = false;
if (LexicalPath::basename(argv[0]) == "more"sv)
emulate_more = true;
Core::ArgsParser args_parser;
args_parser.add_positional_argument(filename, "The paged file", "file", Core::ArgsParser::Required::No);
args_parser.add_option(prompt, "Prompt line", "prompt", 'P', "Prompt");
args_parser.add_option(dont_switch_buffer, "Don't use xterm alternate buffer", "no-init", 'X');
args_parser.add_option(quit_at_eof, "Exit when the end of the file is reached", "quit-at-eof", 'e');
args_parser.add_option(emulate_more, "Pretend that we are more(1)", "emulate-more", 'm');
args_parser.parse(argc, argv);
FILE* file;
@ -297,7 +312,14 @@ int main(int argc, char** argv)
file = fopen(filename, "r");
}
setup_tty();
if (emulate_more) {
// Configure options that match more's behavior
dont_switch_buffer = true;
quit_at_eof = true;
prompt = "--More--";
}
setup_tty(!dont_switch_buffer);
Pager pager(file, stdout, g_wsize.ws_col, g_wsize.ws_row);
pager.set_filename(filename);
@ -311,12 +333,18 @@ int main(int argc, char** argv)
} else if (sequence == "j" || sequence == "\e[B" || sequence == "\n") {
pager.down();
} else if (sequence == "k" || sequence == "\e[A") {
pager.up();
if (!emulate_more)
pager.up();
} else if (sequence == " ") {
pager.down_page();
}
if (quit_at_eof && pager.at_end())
break;
}
teardown_tty();
pager.clear_status();
teardown_tty(!dont_switch_buffer);
return 0;
}