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whitespace: allocate a few more bits and define WS_INCOMPLETE_LINE

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Reserve a few more bits in the diff flags word to be used for future
whitespace rules.  Add WS_INCOMPLETE_LINE without implementing the
behaviour (yet).

Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Junio C Hamano
2025-11-12 14:02:55 -08:00
parent 3a4eb5ad2e
commit a675104c39
5 changed files with 21 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
Documentation/config/core.adoc
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@@ -626,6 +626,8 @@ core.whitespace::
part of the line terminator, i.e. with it, `trailing-space`
does not trigger if the character before such a carriage-return
is not a whitespace (not enabled by default).
* `incomplete-line` treats the last line of a file that is missing the
newline at the end as an error (not enabled by default).
* `tabwidth=<n>` tells how many character positions a tab occupies; this
is relevant for `indent-with-non-tab` and when Git fixes `tab-in-indent`
errors. The default tab width is 8. Allowed values are 1 to 63.

16
diff.c
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@@ -804,15 +804,15 @@ enum diff_symbol {
/*
* Flags for content lines:
* 0..11 are whitespace rules (see ws.h)
* 12..14 are WSEH_NEW | WSEH_CONTEXT | WSEH_OLD
* 16 is marking if the line is blank at EOF
* 17..19 are used for color-moved.
* 0..15 are whitespace rules (see ws.h)
* 16..18 are WSEH_NEW | WSEH_CONTEXT | WSEH_OLD
* 19 is marking if the line is blank at EOF
* 20..22 are used for color-moved.
*/
#define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<16)
#define DIFF_SYMBOL_MOVED_LINE (1<<17)
#define DIFF_SYMBOL_MOVED_LINE_ALT (1<<18)
#define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<19)
#define DIFF_SYMBOL_CONTENT_BLANK_LINE_EOF (1<<19)
#define DIFF_SYMBOL_MOVED_LINE (1<<20)
#define DIFF_SYMBOL_MOVED_LINE_ALT (1<<21)
#define DIFF_SYMBOL_MOVED_LINE_UNINTERESTING (1<<22)
#define DIFF_SYMBOL_CONTENT_WS_MASK (WSEH_NEW | WSEH_OLD | WSEH_CONTEXT | WS_RULE_MASK)

6
diff.h
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@@ -331,9 +331,9 @@ struct diff_options {
int ita_invisible_in_index;
/* white-space error highlighting */
#define WSEH_NEW (1<<12)
#define WSEH_CONTEXT (1<<13)
#define WSEH_OLD (1<<14)
#define WSEH_NEW (1<<16)
#define WSEH_CONTEXT (1<<17)
#define WSEH_OLD (1<<18)
unsigned ws_error_highlight;
const char *prefix;
int prefix_length;

6
ws.c
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@@ -26,6 +26,7 @@ static struct whitespace_rule {
{ "blank-at-eol", WS_BLANK_AT_EOL, 0 },
{ "blank-at-eof", WS_BLANK_AT_EOF, 0 },
{ "tab-in-indent", WS_TAB_IN_INDENT, 0, 1 },
{ "incomplete-line", WS_INCOMPLETE_LINE, 0, 0 },
};
unsigned parse_whitespace_rule(const char *string)
@@ -139,6 +140,11 @@ char *whitespace_error_string(unsigned ws)
strbuf_addstr(&err, ", ");
strbuf_addstr(&err, "tab in indent");
}
if (ws & WS_INCOMPLETE_LINE) {
if (err.len)
strbuf_addstr(&err, ", ");
strbuf_addstr(&err, "no newline at the end of file");
}
return strbuf_detach(&err, NULL);
}

3
ws.h
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@@ -15,13 +15,14 @@ struct strbuf;
#define WS_CR_AT_EOL (1<<9)
#define WS_BLANK_AT_EOF (1<<10)
#define WS_TAB_IN_INDENT (1<<11)
#define WS_INCOMPLETE_LINE (1<<12)
#define WS_TRAILING_SPACE (WS_BLANK_AT_EOL|WS_BLANK_AT_EOF)
#define WS_DEFAULT_RULE (WS_TRAILING_SPACE|WS_SPACE_BEFORE_TAB|8)
#define WS_TAB_WIDTH_MASK ((1<<6)-1)
/* All WS_* -- when extended, adapt constants defined after diff.c:diff_symbol */
#define WS_RULE_MASK ((1<<12)-1)
#define WS_RULE_MASK ((1<<16)-1)
extern unsigned whitespace_rule_cfg;
unsigned whitespace_rule(struct index_state *, const char *);