Stephen Boyd schrieb:
> This specifier represents the sanitized and filename friendly subject
> line of a commit. No checks are made against the length of the string,
> so users may need to trim the result to the desired length if using as a
> filename. This is commonly used by format-patch to massage commit
> subjects into filenames and output patches to files.
>
> Signed-off-by: Stephen Boyd <bebarino@xxxxxxxxx>
> ---
> Documentation/pretty-formats.txt | 1 +
> pretty.c | 38 ++++++++++++++++++++++++++++++++++++++
> 2 files changed, 39 insertions(+), 0 deletions(-)
>
> diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
> index 5c6e678..2a845b1 100644
> --- a/Documentation/pretty-formats.txt
> +++ b/Documentation/pretty-formats.txt
> @@ -121,6 +121,7 @@ The placeholders are:
> - '%d': ref names, like the --decorate option of linkgit:git-log[1]
> - '%e': encoding
> - '%s': subject
> +- '%f': sanitized subject line, suitable for a filename
> - '%b': body
> - '%Cred': switch color to red
> - '%Cgreen': switch color to green
> diff --git a/pretty.c b/pretty.c
> index efa7024..97de415 100644
> --- a/pretty.c
> +++ b/pretty.c
> @@ -493,6 +493,41 @@ static void parse_commit_header(struct format_commit_context *context)
> context->commit_header_parsed = 1;
> }
>
> +static int istitlechar(char c)
> +{
> + return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z') ||
> + (c >= '0' && c <= '9') || c == '.' || c == '_';
How about this?
return isalnum(c) || c == '.' || c == '_';
> +}
> +
> +static void format_sanitized_subject(struct strbuf *sb, const char *msg)
> +{
> + size_t trimlen;
> + int space = 0;
> +
> + for (; *msg && *msg != '\n'; msg++) {
> + if (istitlechar(*msg))
> + {
> + if (space) {
> + strbuf_addch(sb, '-');
> + space = 0;
> + }
> + strbuf_addch(sb, *msg);
> + if (*msg == '.')
> + while (*(msg+1) == '.')
> + msg++;
> + }
> + else
> + space = 1;
> + }
> +
> + // trim any trailing '.' or '-' characters
> + trimlen = 0;
> + while (sb->buf[sb->len - 1 - trimlen] == '.'
> + || sb->buf[sb->len - 1 - trimlen] == '-')
> + trimlen++;
> + strbuf_remove(sb, sb->len - trimlen, trimlen);
You need to make sure that trimming stops as soon as the strbuf has been
shortened to its original length. E.g. for a subject line of "..."
you'd access the char before the first dot currently, or sb->buf[-1] if
the strbuf was empty initially.
(One could also check for sb->len > 0 to just prevent the buffer
underrun, but %f sometimes eating preceding dots and dashes is
counter-intuitive to me.)
> +}
> +
> const char *format_subject(struct strbuf *sb, const char *msg,
> const char *line_separator)
> {
> @@ -683,6 +718,9 @@ static size_t format_commit_item(struct strbuf *sb, const char *placeholder,
> case 's': /* subject */
> format_subject(sb, msg + c->subject_off, " ");
> return 1;
> + case 'f': /* sanitized subject */
> + format_sanitized_subject(sb, msg + c->subject_off);
> + return 1;
> case 'b': /* body */
> strbuf_addstr(sb, msg + c->body_off);
> return 1;
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