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diagnostics: isolate caret_set_column

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* src/location.c (caret_info): Add width and skip members.
(caret_set_column): New.
Use it.
This commit is contained in:
Akim Demaille
2019-09-24 08:30:28 +02:00
parent 56bcccbc51
commit 37c4d0b175
1 changed files with 36 additions and 17 deletions
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53
src/location.c
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@@ -224,6 +224,13 @@ static struct
size_t offset;
/* Length of the current line. */
int line_len;
/* Given the initial column to display, the offset (number of
characters to skip at the beginning of the line). */
int skip;
/* Available width to quote the source file. Eight chars are
consumed by the left-margin (with line number). */
int width;
} caret_info;
void caret_init (void)
@@ -352,6 +359,31 @@ caret_set_line (int line)
return true;
}
/* Compute CARET_INFO.WIDTH and CARET_INFO.SKIP based on the fact that
the first column to display in the current line is COL. */
static bool
caret_set_column (int col)
{
/* Available width. Eight chars are consumed by the left-margin
(with line number). */
caret_info.width = screen_width - 8;
caret_info.skip = 0;
if (caret_info.width < caret_info.line_len)
{
/* We cannot quote the whole line. Make sure we can see the
beginning of the location. */
caret_info.skip = caret_info.width < col ? col - 10 : 0;
}
/* If we skip the initial part, we insert "..." before. */
if (caret_info.skip)
caret_info.width -= 3;
/* If the end of line does not fit, we also need to truncate the
end, and leave "..." there. */
if (caret_info.width < caret_info.line_len - caret_info.skip)
caret_info.width -= 3;
return true;
}
void
location_caret (location loc, const char *style, FILE *out)
{
@@ -361,24 +393,11 @@ location_caret (location loc, const char *style, FILE *out)
return;
if (!caret_set_line (loc.start.line))
return;
if (!caret_set_column (loc.start.column))
return;
/* Available width. Eight chars are consumed by the left-margin
(with line number). */
int width = screen_width - 8;
int skip = 0;
if (width < caret_info.line_len)
{
/* We cannot quote the whole line. Make sure we can see the
beginning of the location. */
skip = width < loc.start.column ? loc.start.column - 10 : 0;
}
/* If we skip the initial part, we insert "..." before. */
if (skip)
width -= 3;
/* If the end of line does not fit, we also need to truncate the
end, and leave "..." there. */
if (width < caret_info.line_len - skip)
width -= 3;
const int width = caret_info.width;
const int skip = caret_info.skip;
/* Read the actual line. Don't update the offset, so that we keep a pointer
to the start of the line. */