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refactor(api): move extmark API to its own file

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This commit is contained in:
Björn Linse
2021-10-25 22:29:02 +02:00
parent 09e96fe609
commit c8882ca7e7
17 changed files with 917 additions and 894 deletions
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697
src/nvim/api/buffer.c
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@@ -32,7 +32,6 @@
#include "nvim/misc1.h"
#include "nvim/move.h"
#include "nvim/ops.h"
#include "nvim/syntax.h"
#include "nvim/undo.h"
#include "nvim/vim.h"
#include "nvim/window.h"
@@ -1238,702 +1237,6 @@ ArrayOf(Integer, 2) nvim_buf_get_mark(Buffer buffer, String name, Error *err)
return rv;
}
static Array extmark_to_array(ExtmarkInfo extmark, bool id, bool add_dict)
{
Array rv = ARRAY_DICT_INIT;
if (id) {
ADD(rv, INTEGER_OBJ((Integer)extmark.mark_id));
}
ADD(rv, INTEGER_OBJ(extmark.row));
ADD(rv, INTEGER_OBJ(extmark.col));
if (add_dict) {
Dictionary dict = ARRAY_DICT_INIT;
if (extmark.end_row >= 0) {
PUT(dict, "end_row", INTEGER_OBJ(extmark.end_row));
PUT(dict, "end_col", INTEGER_OBJ(extmark.end_col));
}
if (extmark.decor) {
Decoration *decor = extmark.decor;
if (decor->hl_id) {
String name = cstr_to_string((const char *)syn_id2name(decor->hl_id));
PUT(dict, "hl_group", STRING_OBJ(name));
}
if (kv_size(decor->virt_text)) {
Array chunks = ARRAY_DICT_INIT;
for (size_t i = 0; i < decor->virt_text.size; i++) {
Array chunk = ARRAY_DICT_INIT;
VirtTextChunk *vtc = &decor->virt_text.items[i];
ADD(chunk, STRING_OBJ(cstr_to_string(vtc->text)));
if (vtc->hl_id > 0) {
ADD(chunk,
STRING_OBJ(cstr_to_string((const char *)syn_id2name(vtc->hl_id))));
}
ADD(chunks, ARRAY_OBJ(chunk));
}
PUT(dict, "virt_text", ARRAY_OBJ(chunks));
}
PUT(dict, "priority", INTEGER_OBJ(decor->priority));
}
if (dict.size) {
ADD(rv, DICTIONARY_OBJ(dict));
}
}
return rv;
}
/// Gets the position (0-indexed) of an extmark.
///
/// @param buffer Buffer handle, or 0 for current buffer
/// @param ns_id Namespace id from |nvim_create_namespace()|
/// @param id Extmark id
/// @param opts Optional parameters. Keys:
/// - details: Whether to include the details dict
/// @param[out] err Error details, if any
/// @return 0-indexed (row, col) tuple or empty list () if extmark id was
/// absent
ArrayOf(Integer) nvim_buf_get_extmark_by_id(Buffer buffer, Integer ns_id,
Integer id, Dictionary opts,
Error *err)
FUNC_API_SINCE(7)
{
Array rv = ARRAY_DICT_INIT;
buf_T *buf = find_buffer_by_handle(buffer, err);
if (!buf) {
return rv;
}
if (!ns_initialized((uint64_t)ns_id)) {
api_set_error(err, kErrorTypeValidation, "Invalid ns_id");
return rv;
}
bool details = false;
for (size_t i = 0; i < opts.size; i++) {
String k = opts.items[i].key;
Object *v = &opts.items[i].value;
if (strequal("details", k.data)) {
if (v->type == kObjectTypeBoolean) {
details = v->data.boolean;
} else if (v->type == kObjectTypeInteger) {
details = v->data.integer;
} else {
api_set_error(err, kErrorTypeValidation, "details is not an boolean");
return rv;
}
} else {
api_set_error(err, kErrorTypeValidation, "unexpected key: %s", k.data);
return rv;
}
}
ExtmarkInfo extmark = extmark_from_id(buf, (uint64_t)ns_id, (uint64_t)id);
if (extmark.row < 0) {
return rv;
}
return extmark_to_array(extmark, false, details);
}
/// Gets extmarks in "traversal order" from a |charwise| region defined by
/// buffer positions (inclusive, 0-indexed |api-indexing|).
///
/// Region can be given as (row,col) tuples, or valid extmark ids (whose
/// positions define the bounds). 0 and -1 are understood as (0,0) and (-1,-1)
/// respectively, thus the following are equivalent:
///
/// <pre>
/// nvim_buf_get_extmarks(0, my_ns, 0, -1, {})
/// nvim_buf_get_extmarks(0, my_ns, [0,0], [-1,-1], {})
/// </pre>
///
/// If `end` is less than `start`, traversal works backwards. (Useful
/// with `limit`, to get the first marks prior to a given position.)
///
/// Example:
///
/// <pre>
/// local a = vim.api
/// local pos = a.nvim_win_get_cursor(0)
/// local ns = a.nvim_create_namespace('my-plugin')
/// -- Create new extmark at line 1, column 1.
/// local m1 = a.nvim_buf_set_extmark(0, ns, 0, 0, 0, {})
/// -- Create new extmark at line 3, column 1.
/// local m2 = a.nvim_buf_set_extmark(0, ns, 0, 2, 0, {})
/// -- Get extmarks only from line 3.
/// local ms = a.nvim_buf_get_extmarks(0, ns, {2,0}, {2,0}, {})
/// -- Get all marks in this buffer + namespace.
/// local all = a.nvim_buf_get_extmarks(0, ns, 0, -1, {})
/// print(vim.inspect(ms))
/// </pre>
///
/// @param buffer Buffer handle, or 0 for current buffer
/// @param ns_id Namespace id from |nvim_create_namespace()|
/// @param start Start of range: a 0-indexed (row, col) or valid extmark id
/// (whose position defines the bound). |api-indexing|
/// @param end End of range (inclusive): a 0-indexed (row, col) or valid
/// extmark id (whose position defines the bound). |api-indexing|
/// @param opts Optional parameters. Keys:
/// - limit: Maximum number of marks to return
/// - details Whether to include the details dict
/// @param[out] err Error details, if any
/// @return List of [extmark_id, row, col] tuples in "traversal order".
Array nvim_buf_get_extmarks(Buffer buffer, Integer ns_id, Object start, Object end, Dictionary opts,
Error *err)
FUNC_API_SINCE(7)
{
Array rv = ARRAY_DICT_INIT;
buf_T *buf = find_buffer_by_handle(buffer, err);
if (!buf) {
return rv;
}
if (!ns_initialized((uint64_t)ns_id)) {
api_set_error(err, kErrorTypeValidation, "Invalid ns_id");
return rv;
}
Integer limit = -1;
bool details = false;
for (size_t i = 0; i < opts.size; i++) {
String k = opts.items[i].key;
Object *v = &opts.items[i].value;
if (strequal("limit", k.data)) {
if (v->type != kObjectTypeInteger) {
api_set_error(err, kErrorTypeValidation, "limit is not an integer");
return rv;
}
limit = v->data.integer;
} else if (strequal("details", k.data)) {
if (v->type == kObjectTypeBoolean) {
details = v->data.boolean;
} else if (v->type == kObjectTypeInteger) {
details = v->data.integer;
} else {
api_set_error(err, kErrorTypeValidation, "details is not an boolean");
return rv;
}
} else {
api_set_error(err, kErrorTypeValidation, "unexpected key: %s", k.data);
return rv;
}
}
if (limit == 0) {
return rv;
} else if (limit < 0) {
limit = INT64_MAX;
}
bool reverse = false;
int l_row;
colnr_T l_col;
if (!extmark_get_index_from_obj(buf, ns_id, start, &l_row, &l_col, err)) {
return rv;
}
int u_row;
colnr_T u_col;
if (!extmark_get_index_from_obj(buf, ns_id, end, &u_row, &u_col, err)) {
return rv;
}
if (l_row > u_row || (l_row == u_row && l_col > u_col)) {
reverse = true;
}
ExtmarkInfoArray marks = extmark_get(buf, (uint64_t)ns_id, l_row, l_col,
u_row, u_col, (int64_t)limit, reverse);
for (size_t i = 0; i < kv_size(marks); i++) {
ADD(rv, ARRAY_OBJ(extmark_to_array(kv_A(marks, i), true, (bool)details)));
}
kv_destroy(marks);
return rv;
}
/// Creates or updates an extmark.
///
/// To create a new extmark, pass id=0. The extmark id will be returned.
/// To move an existing mark, pass its id.
///
/// It is also allowed to create a new mark by passing in a previously unused
/// id, but the caller must then keep track of existing and unused ids itself.
/// (Useful over RPC, to avoid waiting for the return value.)
///
/// Using the optional arguments, it is possible to use this to highlight
/// a range of text, and also to associate virtual text to the mark.
///
/// @param buffer Buffer handle, or 0 for current buffer
/// @param ns_id Namespace id from |nvim_create_namespace()|
/// @param line Line where to place the mark, 0-based. |api-indexing|
/// @param col Column where to place the mark, 0-based. |api-indexing|
/// @param opts Optional parameters.
/// - id : id of the extmark to edit.
/// - end_line : ending line of the mark, 0-based inclusive.
/// - end_col : ending col of the mark, 0-based exclusive.
/// - hl_group : name of the highlight group used to highlight
/// this mark.
/// - hl_eol : when true, for a multiline highlight covering the
/// EOL of a line, continue the highlight for the rest
/// of the screen line (just like for diff and
/// cursorline highlight).
/// - virt_text : virtual text to link to this mark.
/// A list of [text, highlight] tuples, each representing a
/// text chunk with specified highlight. `highlight` element
/// can either be a a single highlight group, or an array of
/// multiple highlight groups that will be stacked
/// (highest priority last). A highlight group can be supplied
/// either as a string or as an integer, the latter which
/// can be obtained using |nvim_get_hl_id_by_name|.
/// - virt_text_pos : position of virtual text. Possible values:
/// - "eol": right after eol character (default)
/// - "overlay": display over the specified column, without
/// shifting the underlying text.
/// - "right_align": display right aligned in the window.
/// - virt_text_win_col : position the virtual text at a fixed
/// window column (starting from the first
/// text column)
/// - virt_text_hide : hide the virtual text when the background
/// text is selected or hidden due to
/// horizontal scroll 'nowrap'
/// - hl_mode : control how highlights are combined with the
/// highlights of the text. Currently only affects
/// virt_text highlights, but might affect `hl_group`
/// in later versions.
/// - "replace": only show the virt_text color. This is the
/// default
/// - "combine": combine with background text color
/// - "blend": blend with background text color.
///
/// - virt_lines : virtual lines to add next to this mark
/// This should be an array over lines, where each line in
/// turn is an array over [text, highlight] tuples. In
/// general, buffer and window options do not affect the
/// display of the text. In particular 'wrap'
/// and 'linebreak' options do not take effect, so
/// the number of extra screen lines will always match
/// the size of the array. However the 'tabstop' buffer
/// option is still used for hard tabs. By default lines are
/// placed below the buffer line containing the mark.
///
/// - virt_lines_above: place virtual lines above instead.
/// - virt_lines_leftcol: Place extmarks in the leftmost
/// column of the window, bypassing
/// sign and number columns.
///
/// - ephemeral : for use with |nvim_set_decoration_provider|
/// callbacks. The mark will only be used for the current
/// redraw cycle, and not be permantently stored in the
/// buffer.
/// - right_gravity : boolean that indicates the direction
/// the extmark will be shifted in when new text is inserted
/// (true for right, false for left). defaults to true.
/// - end_right_gravity : boolean that indicates the direction
/// the extmark end position (if it exists) will be shifted
/// in when new text is inserted (true for right, false
/// for left). Defaults to false.
/// - priority: a priority value for the highlight group. For
/// example treesitter highlighting uses a value of 100.
/// @param[out] err Error details, if any
/// @return Id of the created/updated extmark
Integer nvim_buf_set_extmark(Buffer buffer, Integer ns_id, Integer line, Integer col,
Dict(set_extmark) *opts, Error *err)
FUNC_API_SINCE(7)
{
Decoration decor = DECORATION_INIT;
buf_T *buf = find_buffer_by_handle(buffer, err);
if (!buf) {
goto error;
}
if (!ns_initialized((uint64_t)ns_id)) {
api_set_error(err, kErrorTypeValidation, "Invalid ns_id");
goto error;
}
uint64_t id = 0;
if (opts->id.type == kObjectTypeInteger && opts->id.data.integer > 0) {
id = (uint64_t)opts->id.data.integer;
} else if (HAS_KEY(opts->id)) {
api_set_error(err, kErrorTypeValidation, "id is not a positive integer");
goto error;
}
int line2 = -1;
if (opts->end_line.type == kObjectTypeInteger) {
Integer val = opts->end_line.data.integer;
if (val < 0 || val > buf->b_ml.ml_line_count) {
api_set_error(err, kErrorTypeValidation, "end_line value outside range");
goto error;
} else {
line2 = (int)val;
}
} else if (HAS_KEY(opts->end_line)) {
api_set_error(err, kErrorTypeValidation, "end_line is not an integer");
goto error;
}
colnr_T col2 = -1;
if (opts->end_col.type == kObjectTypeInteger) {
Integer val = opts->end_col.data.integer;
if (val < 0 || val > MAXCOL) {
api_set_error(err, kErrorTypeValidation, "end_col value outside range");
goto error;
} else {
col2 = (int)val;
}
} else if (HAS_KEY(opts->end_col)) {
api_set_error(err, kErrorTypeValidation, "end_col is not an integer");
goto error;
}
if (HAS_KEY(opts->hl_group)) {
decor.hl_id = object_to_hl_id(opts->hl_group, "hl_group", err);
if (ERROR_SET(err)) {
goto error;
}
}
if (opts->virt_text.type == kObjectTypeArray) {
decor.virt_text = parse_virt_text(opts->virt_text.data.array, err,
&decor.virt_text_width);
if (ERROR_SET(err)) {
goto error;
}
} else if (HAS_KEY(opts->virt_text)) {
api_set_error(err, kErrorTypeValidation, "virt_text is not an Array");
goto error;
}
if (opts->virt_text_pos.type == kObjectTypeString) {
String str = opts->virt_text_pos.data.string;
if (strequal("eol", str.data)) {
decor.virt_text_pos = kVTEndOfLine;
} else if (strequal("overlay", str.data)) {
decor.virt_text_pos = kVTOverlay;
} else if (strequal("right_align", str.data)) {
decor.virt_text_pos = kVTRightAlign;
} else {
api_set_error(err, kErrorTypeValidation, "virt_text_pos: invalid value");
goto error;
}
} else if (HAS_KEY(opts->virt_text_pos)) {
api_set_error(err, kErrorTypeValidation, "virt_text_pos is not a String");
goto error;
}
if (opts->virt_text_win_col.type == kObjectTypeInteger) {
decor.col = (int)opts->virt_text_win_col.data.integer;
decor.virt_text_pos = kVTWinCol;
} else if (HAS_KEY(opts->virt_text_win_col)) {
api_set_error(err, kErrorTypeValidation,
"virt_text_win_col is not a Number of the correct size");
goto error;
}
#define OPTION_TO_BOOL(target, name, val) \
target = api_object_to_bool(opts-> name, #name, val, err); \
if (ERROR_SET(err)) { \
goto error; \
}
OPTION_TO_BOOL(decor.virt_text_hide, virt_text_hide, false);
OPTION_TO_BOOL(decor.hl_eol, hl_eol, false);
if (opts->hl_mode.type == kObjectTypeString) {
String str = opts->hl_mode.data.string;
if (strequal("replace", str.data)) {
decor.hl_mode = kHlModeReplace;
} else if (strequal("combine", str.data)) {
decor.hl_mode = kHlModeCombine;
} else if (strequal("blend", str.data)) {
decor.hl_mode = kHlModeBlend;
} else {
api_set_error(err, kErrorTypeValidation,
"virt_text_pos: invalid value");
goto error;
}
} else if (HAS_KEY(opts->hl_mode)) {
api_set_error(err, kErrorTypeValidation, "hl_mode is not a String");
goto error;
}
bool virt_lines_leftcol = false;
OPTION_TO_BOOL(virt_lines_leftcol, virt_lines_leftcol, false);
if (opts->virt_lines.type == kObjectTypeArray) {
Array a = opts->virt_lines.data.array;
for (size_t j = 0; j < a.size; j++) {
if (a.items[j].type != kObjectTypeArray) {
api_set_error(err, kErrorTypeValidation, "virt_text_line item is not an Array");
goto error;
}
int dummig;
VirtText jtem = parse_virt_text(a.items[j].data.array, err, &dummig);
kv_push(decor.virt_lines, ((struct virt_line){ jtem, virt_lines_leftcol }));
if (ERROR_SET(err)) {
goto error;
}
}
} else if (HAS_KEY(opts->virt_lines)) {
api_set_error(err, kErrorTypeValidation, "virt_lines is not an Array");
goto error;
}
OPTION_TO_BOOL(decor.virt_lines_above, virt_lines_above, false);
if (opts->priority.type == kObjectTypeInteger) {
Integer val = opts->priority.data.integer;
if (val < 0 || val > UINT16_MAX) {
api_set_error(err, kErrorTypeValidation, "priority is not a valid value");
goto error;
}
decor.priority = (DecorPriority)val;
} else if (HAS_KEY(opts->priority)) {
api_set_error(err, kErrorTypeValidation, "priority is not a Number of the correct size");
goto error;
}
bool right_gravity = true;
OPTION_TO_BOOL(right_gravity, right_gravity, true);
// Only error out if they try to set end_right_gravity without
// setting end_col or end_line
if (line2 == -1 && col2 == -1 && HAS_KEY(opts->end_right_gravity)) {
api_set_error(err, kErrorTypeValidation,
"cannot set end_right_gravity without setting end_line or end_col");
goto error;
}
bool end_right_gravity = false;
OPTION_TO_BOOL(end_right_gravity, end_right_gravity, false);
size_t len = 0;
bool ephemeral = false;
OPTION_TO_BOOL(ephemeral, ephemeral, false);
if (line < 0 || line > buf->b_ml.ml_line_count) {
api_set_error(err, kErrorTypeValidation, "line value outside range");
goto error;
} else if (line < buf->b_ml.ml_line_count) {
len = ephemeral ? MAXCOL : STRLEN(ml_get_buf(buf, (linenr_T)line+1, false));
}
if (col == -1) {
col = (Integer)len;
} else if (col < -1 || col > (Integer)len) {
api_set_error(err, kErrorTypeValidation, "col value outside range");
goto error;
}
if (col2 >= 0) {
if (line2 >= 0 && line2 < buf->b_ml.ml_line_count) {
len = ephemeral ? MAXCOL : STRLEN(ml_get_buf(buf, (linenr_T)line2 + 1, false));
} else if (line2 == buf->b_ml.ml_line_count) {
// We are trying to add an extmark past final newline
len = 0;
} else {
// reuse len from before
line2 = (int)line;
}
if (col2 > (Integer)len) {
api_set_error(err, kErrorTypeValidation, "end_col value outside range");
goto error;
}
} else if (line2 >= 0) {
col2 = 0;
}
Decoration *d = NULL;
if (ephemeral) {
d = &decor;
} else if (kv_size(decor.virt_text) || kv_size(decor.virt_lines)
|| decor.priority != DECOR_PRIORITY_BASE
|| decor.hl_eol) {
// TODO(bfredl): this is a bit sketchy. eventually we should
// have predefined decorations for both marks/ephemerals
d = xcalloc(1, sizeof(*d));
*d = decor;
} else if (decor.hl_id) {
d = decor_hl(decor.hl_id);
}
// TODO(bfredl): synergize these two branches even more
if (ephemeral && decor_state.buf == buf) {
decor_add_ephemeral((int)line, (int)col, line2, col2, &decor);
} else {
if (ephemeral) {
api_set_error(err, kErrorTypeException, "not yet implemented");
goto error;
}
extmark_set(buf, (uint64_t)ns_id, &id, (int)line, (colnr_T)col, line2, col2,
d, right_gravity, end_right_gravity, kExtmarkNoUndo);
if (kv_size(decor.virt_lines)) {
redraw_buf_line_later(buf, MIN(buf->b_ml.ml_line_count, line+1+(decor.virt_lines_above?0:1)));
}
}
return (Integer)id;
error:
clear_virttext(&decor.virt_text);
return 0;
}
/// Removes an extmark.
///
/// @param buffer Buffer handle, or 0 for current buffer
/// @param ns_id Namespace id from |nvim_create_namespace()|
/// @param id Extmark id
/// @param[out] err Error details, if any
/// @return true if the extmark was found, else false
Boolean nvim_buf_del_extmark(Buffer buffer, Integer ns_id, Integer id, Error *err)
FUNC_API_SINCE(7)
{
buf_T *buf = find_buffer_by_handle(buffer, err);
if (!buf) {
return false;
}
if (!ns_initialized((uint64_t)ns_id)) {
api_set_error(err, kErrorTypeValidation, "Invalid ns_id");
return false;
}
return extmark_del(buf, (uint64_t)ns_id, (uint64_t)id);
}
/// Adds a highlight to buffer.
///
/// Useful for plugins that dynamically generate highlights to a buffer
/// (like a semantic highlighter or linter). The function adds a single
/// highlight to a buffer. Unlike |matchaddpos()| highlights follow changes to
/// line numbering (as lines are inserted/removed above the highlighted line),
/// like signs and marks do.
///
/// Namespaces are used for batch deletion/updating of a set of highlights. To
/// create a namespace, use |nvim_create_namespace()| which returns a namespace
/// id. Pass it in to this function as `ns_id` to add highlights to the
/// namespace. All highlights in the same namespace can then be cleared with
/// single call to |nvim_buf_clear_namespace()|. If the highlight never will be
/// deleted by an API call, pass `ns_id = -1`.
///
/// As a shorthand, `ns_id = 0` can be used to create a new namespace for the
/// highlight, the allocated id is then returned. If `hl_group` is the empty
/// string no highlight is added, but a new `ns_id` is still returned. This is
/// supported for backwards compatibility, new code should use
/// |nvim_create_namespace()| to create a new empty namespace.
///
/// @param buffer Buffer handle, or 0 for current buffer
/// @param ns_id namespace to use or -1 for ungrouped highlight
/// @param hl_group Name of the highlight group to use
/// @param line Line to highlight (zero-indexed)
/// @param col_start Start of (byte-indexed) column range to highlight
/// @param col_end End of (byte-indexed) column range to highlight,
/// or -1 to highlight to end of line
/// @param[out] err Error details, if any
/// @return The ns_id that was used
Integer nvim_buf_add_highlight(Buffer buffer, Integer ns_id, String hl_group, Integer line,
Integer col_start, Integer col_end, Error *err)
FUNC_API_SINCE(1)
{
buf_T *buf = find_buffer_by_handle(buffer, err);
if (!buf) {
return 0;
}
if (line < 0 || line >= MAXLNUM) {
api_set_error(err, kErrorTypeValidation, "Line number outside range");
return 0;
}
if (col_start < 0 || col_start > MAXCOL) {
api_set_error(err, kErrorTypeValidation, "Column value outside range");
return 0;
}
if (col_end < 0 || col_end > MAXCOL) {
col_end = MAXCOL;
}
uint64_t ns = src2ns(&ns_id);
if (!(line < buf->b_ml.ml_line_count)) {
// safety check, we can't add marks outside the range
return ns_id;
}
int hl_id = 0;
if (hl_group.size > 0) {
hl_id = syn_check_group(hl_group.data, (int)hl_group.size);
} else {
return ns_id;
}
int end_line = (int)line;
if (col_end == MAXCOL) {
col_end = 0;
end_line++;
}
extmark_set(buf, ns, NULL,
(int)line, (colnr_T)col_start,
end_line, (colnr_T)col_end,
decor_hl(hl_id), true, false, kExtmarkNoUndo);
return ns_id;
}
/// Clears namespaced objects (highlights, extmarks, virtual text) from
/// a region.
///
/// Lines are 0-indexed. |api-indexing| To clear the namespace in the entire
/// buffer, specify line_start=0 and line_end=-1.
///
/// @param buffer Buffer handle, or 0 for current buffer
/// @param ns_id Namespace to clear, or -1 to clear all namespaces.
/// @param line_start Start of range of lines to clear
/// @param line_end End of range of lines to clear (exclusive) or -1 to clear
/// to end of buffer.
/// @param[out] err Error details, if any
void nvim_buf_clear_namespace(Buffer buffer, Integer ns_id, Integer line_start, Integer line_end,
Error *err)
FUNC_API_SINCE(5)
{
buf_T *buf = find_buffer_by_handle(buffer, err);
if (!buf) {
return;
}
if (line_start < 0 || line_start >= MAXLNUM) {
api_set_error(err, kErrorTypeValidation, "Line number outside range");
return;
}
if (line_end < 0 || line_end > MAXLNUM) {
line_end = MAXLNUM;
}
extmark_clear(buf, (ns_id < 0 ? 0 : (uint64_t)ns_id),
(int)line_start, 0,
(int)line_end-1, MAXCOL);
}
/// call a function with buffer as temporary current buffer
///