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Make it show something 

Move TUI-related code to its own file.
This commit is contained in:
Přemysl Eric Janouch 2016-12-29 22:43:29 +01:00
parent d0eee678b5
commit c6881e8815
Signed by: p
GPG Key ID: B715679E3A361BE6
2 changed files with 342 additions and 365 deletions
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456
hex.c
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@ -44,10 +44,6 @@ enum
ATTRIBUTE_COUNT ATTRIBUTE_COUNT
}; };
// My battle-tested C framework acting as a GLib replacement. Its one big
// disadvantage is missing support for i18n but that can eventually be added
// as an optional feature. Localised applications look super awkward, though.
// User data for logger functions to enable formatted logging // User data for logger functions to enable formatted logging
#define print_fatal_data ((void *) ATTRIBUTE_ERROR) #define print_fatal_data ((void *) ATTRIBUTE_ERROR)
#define print_error_data ((void *) ATTRIBUTE_ERROR) #define print_error_data ((void *) ATTRIBUTE_ERROR)
@ -63,39 +59,10 @@ enum
#ifndef TIOCGWINSZ #ifndef TIOCGWINSZ
#include <sys/ioctl.h> #include <sys/ioctl.h>
#endif // ! TIOCGWINSZ #endif // ! TIOCGWINSZ
#include <ncurses.h>
// ncurses is notoriously retarded for input handling, we need something
// different if only to receive mouse events reliably.
#include "tui.c"
#include "termo.h" #include "termo.h"
// It is surprisingly hard to find a good library to handle Unicode shenanigans,
// and there's enough of those for it to be impractical to reimplement them.
//
// GLib ICU libunistring utf8proc
// Decently sized . . x x
// Grapheme breaks . x . x
// Character width x . x x
// Locale handling . . x .
// Liberal license . x . x
//
// Also note that the ICU API is icky and uses UTF-16 for its primary encoding.
//
// Currently we're chugging along with libunistring but utf8proc seems viable.
// Non-Unicode locales can mostly be handled with simple iconv like in sdtui.
// Similarly grapheme breaks can be guessed at using character width (a basic
// test here is Zalgo text).
//
// None of this is ever going to work too reliably anyway because terminals
// and Unicode don't go awfully well together. In particular, character cell
// devices have some problems with double-wide characters.
#include <unistr.h>
#include <uniwidth.h>
#include <uniconv.h>
#include <unicase.h>
#define APP_TITLE PROGRAM_NAME ///< Left top corner #define APP_TITLE PROGRAM_NAME ///< Left top corner
// --- Utilities --------------------------------------------------------------- // --- Utilities ---------------------------------------------------------------
@ -121,41 +88,14 @@ update_curses_terminal_size (void)
#endif // HAVE_RESIZETERM && TIOCGWINSZ #endif // HAVE_RESIZETERM && TIOCGWINSZ
} }
static char *
latin1_to_utf8 (const char *latin1)
{
struct str converted;
str_init (&converted);
while (*latin1)
{
uint8_t c = *latin1++;
if (c < 0x80)
str_append_c (&converted, c);
else
{
str_append_c (&converted, 0xC0 | (c >> 6));
str_append_c (&converted, 0x80 | (c & 0x3F));
}
}
return str_steal (&converted);
}
// --- Application ------------------------------------------------------------- // --- Application -------------------------------------------------------------
// Function names are prefixed mostly because of curses which clutters the enum
// global namespace and makes it harder to distinguish what functions relate to.
struct attrs
{ {
short fg; ///< Foreground colour index ROW_SIZE = 16, ///< How many bytes on a row
short bg; ///< Background colour index FOOTER_SIZE = 4, ///< How many rows form the footer
chtype attrs; ///< Other attributes
}; };
// Basically a container for most of the globals; no big sense in handing
// around a pointer to this, hence it is a simple global variable as well.
// There is enough global state as it is.
static struct app_context static struct app_context
{ {
// Event loop: // Event loop:
@ -175,7 +115,9 @@ static struct app_context
uint8_t *data; ///< Target data uint8_t *data; ///< Target data
uint64_t data_len; ///< Length of the data uint64_t data_len; ///< Length of the data
uint64_t data_offset; ///< Offset of the data within the file uint64_t data_offset; ///< Offset of the data within the file
uint64_t data_cursor; ///< Current position within the data
uint64_t view_top; ///< Offset of the top of the screen
uint64_t view_cursor; ///< Offset of the cursor
// TODO: get rid of this as it can be computed from "data*" // TODO: get rid of this as it can be computed from "data*"
size_t item_count; ///< Total item count size_t item_count; ///< Total item count
@ -184,10 +126,6 @@ static struct app_context
// Emulated widgets: // Emulated widgets:
// TODO: make this the footer;
// remove this, we know how high the footer is
int header_height; ///< Height of the header
struct poller_idle refresh_event; ///< Refresh the screen struct poller_idle refresh_event; ///< Refresh the screen
// Terminal: // Terminal:
@ -225,43 +163,6 @@ get_config_string (struct config_item *root, const char *key)
return item->value.string.str; return item->value.string.str;
} }
/// Load configuration for a color using a subset of git config colors
static void
app_load_color (struct config_item *subtree, const char *name, int id)
{
const char *value = get_config_string (subtree, name);
if (!value)
return;
struct str_vector v;
str_vector_init (&v);
cstr_split (value, " ", true, &v);
int colors = 0;
struct attrs attrs = { -1, -1, 0 };
for (char **it = v.vector; *it; it++)
{
char *end = NULL;
long n = strtol (*it, &end, 10);
if (*it != end && !*end && n >= SHRT_MIN && n <= SHRT_MAX)
{
if (colors == 0) attrs.fg = n;
if (colors == 1) attrs.bg = n;
colors++;
}
else if (!strcmp (*it, "bold")) attrs.attrs |= A_BOLD;
else if (!strcmp (*it, "dim")) attrs.attrs |= A_DIM;
else if (!strcmp (*it, "ul")) attrs.attrs |= A_UNDERLINE;
else if (!strcmp (*it, "blink")) attrs.attrs |= A_BLINK;
else if (!strcmp (*it, "reverse")) attrs.attrs |= A_REVERSE;
#ifdef A_ITALIC
else if (!strcmp (*it, "italic")) attrs.attrs |= A_ITALIC;
#endif // A_ITALIC
}
str_vector_free (&v);
g_ctx.attrs[id] = attrs;
}
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void static void
@ -272,8 +173,10 @@ load_config_colors (struct config_item *subtree, void *user_data)
// The attributes cannot be changed dynamically right now, so it doesn't // The attributes cannot be changed dynamically right now, so it doesn't
// make much sense to make use of "on_change" callbacks either. // make much sense to make use of "on_change" callbacks either.
// For simplicity, we should reload the entire table on each change anyway. // For simplicity, we should reload the entire table on each change anyway.
const char *value;
#define XX(name, config, fg_, bg_, attrs_) \ #define XX(name, config, fg_, bg_, attrs_) \
app_load_color (subtree, config, ATTRIBUTE_ ## name); if ((value = get_config_string (subtree, config))) \
g_ctx.attrs[ATTRIBUTE_ ## name] = attrs_decode (value);
ATTRIBUTE_TABLE (XX) ATTRIBUTE_TABLE (XX)
#undef XX #undef XX
} }
@ -342,12 +245,9 @@ app_init_terminal (void)
TERMO_CHECK_VERSION; TERMO_CHECK_VERSION;
if (!(g_ctx.tk = termo_new (STDIN_FILENO, NULL, 0))) if (!(g_ctx.tk = termo_new (STDIN_FILENO, NULL, 0)))
abort (); abort ();
if (!initscr () || nonl () == ERR) if (!initscr () || nonl () == ERR || curs_set (1) == ERR)
abort (); abort ();
// Disable cursor, we're not going to use it most of the time
curs_set (0);
// By default we don't use any colors so they're not required... // By default we don't use any colors so they're not required...
if (start_color () == ERR if (start_color () == ERR
|| use_default_colors () == ERR || use_default_colors () == ERR
@ -407,179 +307,6 @@ app_is_character_in_locale (ucs4_t ch)
return true; return true;
} }
// --- Terminal output ---------------------------------------------------------
// Necessary abstraction to simplify aligned, formatted character output
struct row_char
{
ucs4_t c; ///< Unicode codepoint
chtype attrs; ///< Special attributes
int width; ///< How many cells this takes
};
struct row_buffer
{
struct row_char *chars; ///< Characters
size_t chars_len; ///< Character count
size_t chars_alloc; ///< Characters allocated
int total_width; ///< Total width of all characters
};
static void
row_buffer_init (struct row_buffer *self)
{
memset (self, 0, sizeof *self);
self->chars = xcalloc (sizeof *self->chars, (self->chars_alloc = 256));
}
static void
row_buffer_free (struct row_buffer *self)
{
free (self->chars);
}
/// Replace invalid chars and push all codepoints to the array w/ attributes.
static void
row_buffer_append (struct row_buffer *self, const char *str, chtype attrs)
{
// The encoding is only really used internally for some corner cases
const char *encoding = locale_charset ();
// Note that this function is a hotspot, try to keep it decently fast
struct row_char current = { .attrs = attrs };
struct row_char invalid = { .attrs = attrs, .c = '?', .width = 1 };
const uint8_t *next = (const uint8_t *) str;
while ((next = u8_next (&current.c, next)))
{
if (self->chars_len >= self->chars_alloc)
self->chars = xreallocarray (self->chars,
sizeof *self->chars, (self->chars_alloc <<= 1));
current.width = uc_width (current.c, encoding);
if (current.width < 0 || !app_is_character_in_locale (current.c))
current = invalid;
self->chars[self->chars_len++] = current;
self->total_width += current.width;
}
}
static void
row_buffer_addv (struct row_buffer *self, const char *s, ...)
ATTRIBUTE_SENTINEL;
static void
row_buffer_addv (struct row_buffer *self, const char *s, ...)
{
va_list ap;
va_start (ap, s);
while (s)
{
row_buffer_append (self, s, va_arg (ap, chtype));
s = va_arg (ap, const char *);
}
va_end (ap);
}
/// Pop as many codepoints as needed to free up "space" character cells.
/// Given the suffix nature of combining marks, this should work pretty fine.
static int
row_buffer_pop_cells (struct row_buffer *self, int space)
{
int made = 0;
while (self->chars_len && made < space)
made += self->chars[--self->chars_len].width;
self->total_width -= made;
return made;
}
static void
row_buffer_space (struct row_buffer *self, int width, chtype attrs)
{
if (width < 0)
return;
while (self->chars_len + width >= self->chars_alloc)
self->chars = xreallocarray (self->chars,
sizeof *self->chars, (self->chars_alloc <<= 1));
struct row_char space = { .attrs = attrs, .c = ' ', .width = 1 };
self->total_width += width;
while (width-- > 0)
self->chars[self->chars_len++] = space;
}
static void
row_buffer_ellipsis (struct row_buffer *self, int target)
{
if (self->total_width <= target
|| !row_buffer_pop_cells (self, self->total_width - target))
return;
// We use attributes from the last character we've removed,
// assuming that we don't shrink the array (and there's no real need)
ucs4_t ellipsis = L'…';
if (app_is_character_in_locale (ellipsis))
{
if (self->total_width >= target)
row_buffer_pop_cells (self, 1);
if (self->total_width + 1 <= target)
row_buffer_append (self, "…", self->chars[self->chars_len].attrs);
}
else if (target >= 3)
{
if (self->total_width >= target)
row_buffer_pop_cells (self, 3);
if (self->total_width + 3 <= target)
row_buffer_append (self, "...", self->chars[self->chars_len].attrs);
}
}
static void
row_buffer_align (struct row_buffer *self, int target, chtype attrs)
{
row_buffer_ellipsis (self, target);
row_buffer_space (self, target - self->total_width, attrs);
}
static void
row_buffer_print (uint32_t *ucs4, chtype attrs)
{
// This assumes that we can reset the attribute set without consequences
char *str = u32_strconv_to_locale (ucs4);
if (str)
{
attrset (attrs);
addstr (str);
attrset (0);
free (str);
}
}
static void
row_buffer_flush (struct row_buffer *self)
{
if (!self->chars_len)
return;
// We only NUL-terminate the chunks because of the libunistring API
uint32_t chunk[self->chars_len + 1], *insertion_point = chunk;
for (size_t i = 0; i < self->chars_len; i++)
{
struct row_char *iter = self->chars + i;
if (i && iter[0].attrs != iter[-1].attrs)
{
row_buffer_print (chunk, iter[-1].attrs);
insertion_point = chunk;
}
*insertion_point++ = iter->c;
*insertion_point = 0;
}
row_buffer_print (chunk, self->chars[self->chars_len - 1].attrs);
}
// --- Rendering --------------------------------------------------------------- // --- Rendering ---------------------------------------------------------------
static void static void
@ -609,39 +336,75 @@ app_write_line (const char *str, chtype attrs)
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
static void static int
app_flush_header (struct row_buffer *buf, chtype attrs) app_visible_items (void)
{ {
move (g_ctx.header_height++, 0); return MAX (0, LINES - FOOTER_SIZE);
app_flush_buffer (buf, COLS, attrs);
} }
static void static void
app_draw_status (void) app_draw_view (void)
{ {
// XXX: can we get rid of this and still make it look acceptable? uint64_t end_addr = g_ctx.data_offset + g_ctx.data_len;
chtype a_normal = APP_ATTR (HEADER); for (int y = 0; y < app_visible_items (); y++)
chtype a_highlight = APP_ATTR (HIGHLIGHT);
struct row_buffer buf;
row_buffer_init (&buf);
// ...
app_flush_header (&buf, a_normal);
}
static void
app_draw_header (void)
{
// TODO: call app_fix_view_range() if it changes from the previous value
g_ctx.header_height = 0;
if (true)
app_draw_status ();
else
{ {
move (g_ctx.header_height++, 0); uint64_t row_addr = g_ctx.view_top + y * ROW_SIZE;
app_write_line ("Connecting to MPD...", APP_ATTR (HEADER)); if (row_addr > end_addr)
break;
int row_attrs = (row_addr / ROW_SIZE & 1)
? APP_ATTR (ODD) : APP_ATTR (EVEN);
struct row_buffer buf;
row_buffer_init (&buf);
char *row_addr_str = xstrdup_printf ("%08" PRIX64, row_addr);
row_buffer_append (&buf, row_addr_str, row_attrs);
free (row_addr_str);
struct str ascii;
str_init (&ascii);
str_append (&ascii, " ");
for (int x = 0; x < ROW_SIZE; x++)
{
if (x % 8 == 0) row_buffer_append (&buf, " ", row_attrs);
if (x % 2 == 0) row_buffer_append (&buf, " ", row_attrs);
uint64_t cell_addr = row_addr + x;
if (cell_addr < g_ctx.data_offset
|| cell_addr >= end_addr)
{
row_buffer_append (&buf, " ", row_attrs);
str_append_c (&ascii, ' ');
}
else
{
uint8_t cell = g_ctx.data[cell_addr - g_ctx.data_offset];
char *hex = xstrdup_printf ("%02x", cell);
row_buffer_append (&buf, hex, row_attrs);
free (hex);
if (cell >= 32 && cell < 127)
str_append_c (&ascii, cell);
else
str_append_c (&ascii, '.');
}
}
row_buffer_append (&buf, ascii.str, row_attrs);
str_free (&ascii);
move (y, 0);
app_flush_buffer (&buf, COLS, row_attrs);
} }
}
static void
app_draw_footer (void)
{
move (app_visible_items (), 0);
// TODO: write the footer
app_write_line ("Connecting to MPD...", APP_ATTR (HEADER));
// XXX: can we get rid of this and still make it look acceptable? // XXX: can we get rid of this and still make it look acceptable?
chtype a_normal = APP_ATTR (BAR); chtype a_normal = APP_ATTR (BAR);
@ -655,53 +418,7 @@ app_draw_header (void)
row_buffer_append (&buf, " ", a_normal); row_buffer_append (&buf, " ", a_normal);
// TODO: endian indication, position indication // TODO: endian indication, position indication
app_flush_header (&buf, a_normal); app_flush_buffer (&buf, COLS, a_normal);
}
static int
app_visible_items (void)
{
// This may eventually include a header bar and/or a status bar
return MAX (0, LINES - g_ctx.header_height);
}
static void
app_draw_view (void)
{
move (g_ctx.header_height, 0);
clrtobot ();
int view_width = COLS;
int to_show = MIN (LINES - g_ctx.header_height,
(int) g_ctx.item_count - g_ctx.item_top);
for (int row = 0; row < to_show; row++)
{
int item_index = g_ctx.item_top + row;
int row_attrs = (item_index & 1) ? APP_ATTR (ODD) : APP_ATTR (EVEN);
if (item_index == g_ctx.item_selected)
row_attrs = APP_ATTR (SELECTION);
struct row_buffer buf;
row_buffer_init (&buf);
// TODO: draw the row using view_width
// Combine attributes used by the handler with the defaults.
// Avoiding attrset() because of row_buffer_flush().
for (size_t i = 0; i < buf.chars_len; i++)
{
chtype *attrs = &buf.chars[i].attrs;
if (item_index == g_ctx.item_selected)
*attrs = (*attrs & ~(A_COLOR | A_REVERSE)) | row_attrs;
else if ((*attrs & A_COLOR) && (row_attrs & A_COLOR))
*attrs |= (row_attrs & ~A_COLOR);
else
*attrs |= row_attrs;
}
move (g_ctx.header_height + row, 0);
app_flush_buffer (&buf, view_width, row_attrs);
}
} }
static void static void
@ -710,8 +427,11 @@ app_on_refresh (void *user_data)
(void) user_data; (void) user_data;
poller_idle_reset (&g_ctx.refresh_event); poller_idle_reset (&g_ctx.refresh_event);
app_draw_header (); erase ();
app_draw_view (); app_draw_view ();
app_draw_footer ();
// TODO: move the cursor where it belongs
refresh (); refresh ();
} }
@ -853,12 +573,12 @@ app_process_action (enum action action)
break; break;
case ACTION_GOTO_PAGE_PREVIOUS: case ACTION_GOTO_PAGE_PREVIOUS:
app_scroll ((int) g_ctx.header_height - LINES); app_scroll (FOOTER_SIZE - LINES);
app_move_selection ((int) g_ctx.header_height - LINES); app_move_selection (FOOTER_SIZE - LINES);
break; break;
case ACTION_GOTO_PAGE_NEXT: case ACTION_GOTO_PAGE_NEXT:
app_scroll (LINES - (int) g_ctx.header_height); app_scroll (LINES - FOOTER_SIZE);
app_move_selection (LINES - (int) g_ctx.header_height); app_move_selection (LINES - FOOTER_SIZE);
break; break;
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
@ -877,12 +597,13 @@ app_process_action (enum action action)
static bool static bool
app_process_left_mouse_click (int line, int column) app_process_left_mouse_click (int line, int column)
{ {
if (line == g_ctx.header_height - 1) if (line == app_visible_items ())
{ {
// TODO: LE/BE switch, maybe something else
} }
else else if (line < app_visible_items ())
{ {
int row_index = line - g_ctx.header_height; int row_index = line;
if (row_index < 0 if (row_index < 0
|| row_index >= (int) g_ctx.item_count - g_ctx.item_top) || row_index >= (int) g_ctx.item_count - g_ctx.item_top)
return false; return false;
@ -936,6 +657,7 @@ g_default_bindings[] =
{ "C-n", ACTION_GOTO_ITEM_NEXT }, { "C-n", ACTION_GOTO_ITEM_NEXT },
{ "C-b", ACTION_GOTO_PAGE_PREVIOUS }, { "C-b", ACTION_GOTO_PAGE_PREVIOUS },
{ "C-f", ACTION_GOTO_PAGE_NEXT }, { "C-f", ACTION_GOTO_PAGE_NEXT },
// TODO: C-e and C-y scroll up and down
// Not sure how to set these up, they're pretty arbitrary so far // Not sure how to set these up, they're pretty arbitrary so far
{ "Enter", ACTION_CHOOSE }, { "Enter", ACTION_CHOOSE },
@ -1271,6 +993,9 @@ main (int argc, char *argv[])
g_ctx.data = (uint8_t *) buf.str; g_ctx.data = (uint8_t *) buf.str;
g_ctx.data_len = buf.len; g_ctx.data_len = buf.len;
g_ctx.view_top = g_ctx.data_offset / ROW_SIZE * ROW_SIZE;
g_ctx.view_cursor = g_ctx.data_offset;
// We only need to convert to and from the terminal encoding // We only need to convert to and from the terminal encoding
if (!setlocale (LC_CTYPE, "")) if (!setlocale (LC_CTYPE, ""))
print_warning ("failed to set the locale"); print_warning ("failed to set the locale");
@ -1280,6 +1005,7 @@ main (int argc, char *argv[])
app_init_terminal (); app_init_terminal ();
signals_setup_handlers (); signals_setup_handlers ();
app_init_poller_events (); app_init_poller_events ();
app_invalidate ();
// Redirect all messages from liberty so that they don't disrupt display // Redirect all messages from liberty so that they don't disrupt display
g_log_message_real = app_log_handler; g_log_message_real = app_log_handler;

251
tui.c Normal file
View File

@ -0,0 +1,251 @@
// This file is to be moved to liberty, along with FindUnistring.cmake,
// and then used in both hex and nncmpp
// This file includes some common stuff to build TUI applications with
#include <ncurses.h>
// It is surprisingly hard to find a good library to handle Unicode shenanigans,
// and there's enough of those for it to be impractical to reimplement them.
//
// GLib ICU libunistring utf8proc
// Decently sized . . x x
// Grapheme breaks . x . x
// Character width x . x x
// Locale handling . . x .
// Liberal license . x . x
//
// Also note that the ICU API is icky and uses UTF-16 for its primary encoding.
//
// Currently we're chugging along with libunistring but utf8proc seems viable.
// Non-Unicode locales can mostly be handled with simple iconv like in sdtui.
// Similarly grapheme breaks can be guessed at using character width (a basic
// test here is Zalgo text).
//
// None of this is ever going to work too reliably anyway because terminals
// and Unicode don't go awfully well together. In particular, character cell
// devices have some problems with double-wide characters.
#include <unistr.h>
#include <uniwidth.h>
#include <uniconv.h>
#include <unicase.h>
// --- Configurable display attributes -----------------------------------------
struct attrs
{
short fg; ///< Foreground colour index
short bg; ///< Background colour index
chtype attrs; ///< Other attributes
};
/// Decode attributes in the value using a subset of the git config format,
/// ignoring all errors since it doesn't affect functionality
static struct attrs
attrs_decode (const char *value)
{
struct str_vector v;
str_vector_init (&v);
cstr_split (value, " ", true, &v);
int colors = 0;
struct attrs attrs = { -1, -1, 0 };
for (char **it = v.vector; *it; it++)
{
char *end = NULL;
long n = strtol (*it, &end, 10);
if (*it != end && !*end && n >= SHRT_MIN && n <= SHRT_MAX)
{
if (colors == 0) attrs.fg = n;
if (colors == 1) attrs.bg = n;
colors++;
}
else if (!strcmp (*it, "bold")) attrs.attrs |= A_BOLD;
else if (!strcmp (*it, "dim")) attrs.attrs |= A_DIM;
else if (!strcmp (*it, "ul")) attrs.attrs |= A_UNDERLINE;
else if (!strcmp (*it, "blink")) attrs.attrs |= A_BLINK;
else if (!strcmp (*it, "reverse")) attrs.attrs |= A_REVERSE;
#ifdef A_ITALIC
else if (!strcmp (*it, "italic")) attrs.attrs |= A_ITALIC;
#endif // A_ITALIC
}
str_vector_free (&v);
return attrs;
}
// --- Terminal output ---------------------------------------------------------
// Necessary abstraction to simplify aligned, formatted character output
// This callback you need to implement in the application
static bool app_is_character_in_locale (ucs4_t ch);
struct row_char
{
ucs4_t c; ///< Unicode codepoint
chtype attrs; ///< Special attributes
int width; ///< How many cells this takes
};
struct row_buffer
{
struct row_char *chars; ///< Characters
size_t chars_len; ///< Character count
size_t chars_alloc; ///< Characters allocated
int total_width; ///< Total width of all characters
};
static void
row_buffer_init (struct row_buffer *self)
{
memset (self, 0, sizeof *self);
self->chars = xcalloc (sizeof *self->chars, (self->chars_alloc = 256));
}
static void
row_buffer_free (struct row_buffer *self)
{
free (self->chars);
}
/// Replace invalid chars and push all codepoints to the array w/ attributes.
static void
row_buffer_append (struct row_buffer *self, const char *str, chtype attrs)
{
// The encoding is only really used internally for some corner cases
const char *encoding = locale_charset ();
// Note that this function is a hotspot, try to keep it decently fast
struct row_char current = { .attrs = attrs };
struct row_char invalid = { .attrs = attrs, .c = '?', .width = 1 };
const uint8_t *next = (const uint8_t *) str;
while ((next = u8_next (&current.c, next)))
{
if (self->chars_len >= self->chars_alloc)
self->chars = xreallocarray (self->chars,
sizeof *self->chars, (self->chars_alloc <<= 1));
current.width = uc_width (current.c, encoding);
if (current.width < 0 || !app_is_character_in_locale (current.c))
current = invalid;
self->chars[self->chars_len++] = current;
self->total_width += current.width;
}
}
static void
row_buffer_addv (struct row_buffer *self, const char *s, ...)
ATTRIBUTE_SENTINEL;
static void
row_buffer_addv (struct row_buffer *self, const char *s, ...)
{
va_list ap;
va_start (ap, s);
while (s)
{
row_buffer_append (self, s, va_arg (ap, chtype));
s = va_arg (ap, const char *);
}
va_end (ap);
}
/// Pop as many codepoints as needed to free up "space" character cells.
/// Given the suffix nature of combining marks, this should work pretty fine.
static int
row_buffer_pop_cells (struct row_buffer *self, int space)
{
int made = 0;
while (self->chars_len && made < space)
made += self->chars[--self->chars_len].width;
self->total_width -= made;
return made;
}
static void
row_buffer_space (struct row_buffer *self, int width, chtype attrs)
{
if (width < 0)
return;
while (self->chars_len + width >= self->chars_alloc)
self->chars = xreallocarray (self->chars,
sizeof *self->chars, (self->chars_alloc <<= 1));
struct row_char space = { .attrs = attrs, .c = ' ', .width = 1 };
self->total_width += width;
while (width-- > 0)
self->chars[self->chars_len++] = space;
}
static void
row_buffer_ellipsis (struct row_buffer *self, int target)
{
if (self->total_width <= target
|| !row_buffer_pop_cells (self, self->total_width - target))
return;
// We use attributes from the last character we've removed,
// assuming that we don't shrink the array (and there's no real need)
ucs4_t ellipsis = L'…';
if (app_is_character_in_locale (ellipsis))
{
if (self->total_width >= target)
row_buffer_pop_cells (self, 1);
if (self->total_width + 1 <= target)
row_buffer_append (self, "…", self->chars[self->chars_len].attrs);
}
else if (target >= 3)
{
if (self->total_width >= target)
row_buffer_pop_cells (self, 3);
if (self->total_width + 3 <= target)
row_buffer_append (self, "...", self->chars[self->chars_len].attrs);
}
}
static void
row_buffer_align (struct row_buffer *self, int target, chtype attrs)
{
row_buffer_ellipsis (self, target);
row_buffer_space (self, target - self->total_width, attrs);
}
static void
row_buffer_print (uint32_t *ucs4, chtype attrs)
{
// This assumes that we can reset the attribute set without consequences
char *str = u32_strconv_to_locale (ucs4);
if (str)
{
attrset (attrs);
addstr (str);
attrset (0);
free (str);
}
}
static void
row_buffer_flush (struct row_buffer *self)
{
if (!self->chars_len)
return;
// We only NUL-terminate the chunks because of the libunistring API
uint32_t chunk[self->chars_len + 1], *insertion_point = chunk;
for (size_t i = 0; i < self->chars_len; i++)
{
struct row_char *iter = self->chars + i;
if (i && iter[0].attrs != iter[-1].attrs)
{
row_buffer_print (chunk, iter[-1].attrs);
insertion_point = chunk;
}
*insertion_point++ = iter->c;
*insertion_point = 0;
}
row_buffer_print (chunk, self->chars[self->chars_len - 1].attrs);
}