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git2cpp/src/utils/terminal_pager.cpp at main · QuantStack/git2cpp · GitHub
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utils
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terminal_pager.cpp
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git2cpp
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src
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utils
/
terminal_pager.cpp
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#
include
<
cctype
>
#
include
<
cstdint
>
#
include
<
cstdio
>
#
include
<
iostream
>
#
include
<
ranges
>
//
OS-specific libraries.
#
include
<
sys/ioctl.h
>
#
include
<
termcolor/termcolor.hpp
>
#
include
"
ansi_code.hpp
"
#
include
"
common.hpp
"
#
include
"
input_output.hpp
"
#
include
"
terminal_pager.hpp
"
terminal_pager::terminal_pager
()
: m_rows(
0
)
, m_columns(
0
)
, m_start_row_index(
0
)
{
maybe_grab_cout
();
}
terminal_pager::~terminal_pager
()
{
release_cout
();
}
std::string
terminal_pager::get_input
()
const
{
//
Blocks until input received.
std::string str;
char
ch;
std::cin.
get
(ch);
str += ch;
if
(
ansi_code::is_escape_char
(ch))
//
Start of ANSI escape sequence.
{
do
{
std::cin.
get
(ch);
str += ch;
}
while
(!
std::isalpha
(ch));
//
ANSI escape sequence ends with a letter.
}
return
str;
}
void
terminal_pager::maybe_grab_cout
()
{
//
Unfortunately need to access _internal namespace of termcolor to check if a tty.
if
(
termcolor::_internal::is_atty
(std::cout))
{
//
Should we do anything with cerr?
m_cout_rdbuf = std::cout.
rdbuf
(&m_stringbuf);
}
else
{
m_cout_rdbuf = std::cout.
rdbuf
();
}
}
bool
terminal_pager::process_input
(std::string input)
{
if
(input.
size
() ==
0
)
{
return
true
;
}
switch
(input[
0
])
{
case
'
q
'
:
case
'
Q
'
:
return
true
;
//
Exit pager.
case
'
u
'
:
case
'
U
'
:
scroll
(
true
,
true
);
//
Up a page.
return
false
;
case
'
d
'
:
case
'
D
'
:
case
'
'
:
scroll
(
false
,
true
);
//
Down a page.
return
false
;
case
'
\n
'
:
scroll
(
false
,
false
);
//
Down a line.
return
false
;
case
'
\e
'
:
//
ANSI escape sequence.
//
Cannot switch on a std::string.
if
(
ansi_code::is_up_arrow
(input))
{
scroll
(
true
,
false
);
//
Up a line.
return
false
;
}
else
if
(
ansi_code::is_down_arrow
(input))
{
scroll
(
false
,
false
);
//
Down a line.
return
false
;
}
}
std::cout << ansi_code::bel;
return
false
;
}
void
terminal_pager::release_cout
()
{
std::cout.
rdbuf
(m_cout_rdbuf);
}
void
terminal_pager::render_terminal
()
const
{
auto
end_row_index = m_start_row_index + m_rows -
1
;
std::cout << ansi_code::erase_screen;
std::cout << ansi_code::cursor_to_top;
for
(
size_t
i = m_start_row_index; i < end_row_index; i++)
{
if
(i >= m_lines.
size
())
{
break
;
}
std::cout << m_lines[i] << std::endl;
}
std::cout <<
ansi_code::cursor_to_row
(m_rows);
//
Move cursor to bottom row of terminal.
std::cout <<
"
:
"
;
}
void
terminal_pager::scroll
(
bool
up,
bool
page)
{
update_terminal_size
();
const
auto
old_start_row_index = m_start_row_index;
size_t
offset = page ? m_rows -
1
:
1
;
if
(up)
{
//
Care needed to avoid underflow of unsigned size_t.
if
(m_start_row_index >= offset)
{
m_start_row_index -= offset;
}
else
{
m_start_row_index =
0
;
}
}
else
{
m_start_row_index += offset;
auto
end_row_index = m_start_row_index + m_rows -
1
;
if
(end_row_index > m_lines.
size
())
{
m_start_row_index = m_lines.
size
() - (m_rows -
1
);
}
}
if
(m_start_row_index == old_start_row_index)
{
std::cout << ansi_code::bel;
}
else
{
render_terminal
();
}
}
void
terminal_pager::show
()
{
release_cout
();
m_lines =
split_input_at_newlines
(m_stringbuf.
view
());
update_terminal_size
();
if
(m_rows ==
0
|| m_lines.
size
() <= m_rows -
1
)
{
//
Don't need to use pager, can display directly.
for
(
auto
line : m_lines)
{
std::cout << line << std::endl;
}
m_lines.
clear
();
return
;
}
alternative_buffer alt_buffer;
m_start_row_index =
0
;
render_terminal
();
bool
stop =
false
;
do
{
stop =
process_input
(
get_input
());
}
while
(!stop);
m_lines.
clear
();
m_start_row_index =
0
;
}
void
terminal_pager::update_terminal_size
()
{
struct
winsize
size;
int
err =
ioctl
(
fileno
(stdout),
TIOCGWINSZ
, &size);
if
(err ==
0
)
{
m_rows = size.
ws_row
;
m_columns = size.
ws_col
;
}
else
{
m_rows = m_columns =
0
;
}
}
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