/*

* Another stupid program, this one parsing the headers of an

* email to figure out authorship and subject

*/

#include "cache.h"

#include "builtin.h"

#include "utf8.h"

#include "strbuf.h"

static FILE *cmitmsg, *patchfile, *fin, *fout;

static int keep_subject;

static const char *metainfo_charset;

static struct strbuf line = STRBUF_INIT;

static struct strbuf name = STRBUF_INIT;

static struct strbuf email = STRBUF_INIT;

static enum {

TE_DONTCARE, TE_QP, TE_BASE64,

} transfer_encoding;

static enum {

TYPE_TEXT, TYPE_OTHER,

} message_type;

static struct strbuf charset = STRBUF_INIT;

static int patch_lines;

static struct strbuf **p_hdr_data, **s_hdr_data;

static int use_scissors;

#define MAX_HDR_PARSED 10

#define MAX_BOUNDARIES 5

static void cleanup_space(struct strbuf *sb);

static void get_sane_name(struct strbuf *out, struct strbuf *name, struct strbuf *email)

{

struct strbuf *src = name;

if (name->len < 3 || 60 < name->len || strchr(name->buf, '@') ||

strchr(name->buf, '<') || strchr(name->buf, '>'))

src = email;

else if (name == out)

return;

strbuf_reset(out);

strbuf_addbuf(out, src);

}

static void parse_bogus_from(const struct strbuf *line)

{

/* John Doe <johndoe> */

char *bra, *ket;

/* This is fallback, so do not bother if we already have an

* e-mail address.

*/

if (email.len)

return;

bra = strchr(line->buf, '<');

if (!bra)

return;

ket = strchr(bra, '>');

if (!ket)

return;

strbuf_reset(&email);

strbuf_add(&email, bra + 1, ket - bra - 1);

strbuf_reset(&name);

strbuf_add(&name, line->buf, bra - line->buf);

strbuf_trim(&name);

get_sane_name(&name, &name, &email);

}

static void handle_from(const struct strbuf *from)

{

char *at;

size_t el;

struct strbuf f;

strbuf_init(&f, from->len);

strbuf_addbuf(&f, from);

at = strchr(f.buf, '@');

if (!at) {

parse_bogus_from(from);

return;

}

/*

* If we already have one email, don't take any confusing lines

*/

if (email.len && strchr(at + 1, '@')) {

strbuf_release(&f);

return;

}

/* Pick up the string around '@', possibly delimited with <>

* pair; that is the email part.

*/

while (at > f.buf) {

char c = at[-1];

if (isspace(c))

break;

if (c == '<') {

at[-1] = ' ';

break;

}

at--;

}

el = strcspn(at, " \n\t\r\v\f>");

strbuf_reset(&email);

strbuf_add(&email, at, el);

strbuf_remove(&f, at - f.buf, el + (at[el] ? 1 : 0));

/* The remainder is name. It could be

*

* - "John Doe <john.doe@xz>" (a), or

* - "john.doe@xz (John Doe)" (b), or

* - "John (zzz) Doe <john.doe@xz> (Comment)" (c)

*

* but we have removed the email part, so

*

* - remove extra spaces which could stay after email (case 'c'), and

* - trim from both ends, possibly removing the () pair at the end

* (cases 'a' and 'b').

*/

cleanup_space(&f);

strbuf_trim(&f);

if (f.buf[0] == '(' && f.len && f.buf[f.len - 1] == ')') {

strbuf_remove(&f, 0, 1);

strbuf_setlen(&f, f.len - 1);

}

get_sane_name(&name, &f, &email);

strbuf_release(&f);

}

static void handle_header(struct strbuf **out, const struct strbuf *line)

{

if (!*out) {

*out = xmalloc(sizeof(struct strbuf));

strbuf_init(*out, line->len);

} else

strbuf_reset(*out);

strbuf_addbuf(*out, line);

}

/* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt

* to have enough heuristics to grok MIME encoded patches often found

* on our mailing lists. For example, we do not even treat header lines

* case insensitively.

*/

static int slurp_attr(const char *line, const char *name, struct strbuf *attr)

{

const char *ends, *ap = strcasestr(line, name);

size_t sz;

if (!ap) {

strbuf_setlen(attr, 0);

return 0;

}

ap += strlen(name);

if (*ap == '"') {

ap++;

ends = "\"";

}

else

ends = "; \t";

sz = strcspn(ap, ends);

strbuf_add(attr, ap, sz);

return 1;

}

static struct strbuf *content[MAX_BOUNDARIES];

static struct strbuf **content_top = content;

static void handle_content_type(struct strbuf *line)

{

struct strbuf *boundary = xmalloc(sizeof(struct strbuf));

strbuf_init(boundary, line->len);

if (!strcasestr(line->buf, "text/"))

message_type = TYPE_OTHER;

if (slurp_attr(line->buf, "boundary=", boundary)) {

strbuf_insert(boundary, 0, "--", 2);

if (++content_top > &content[MAX_BOUNDARIES]) {

fprintf(stderr, "Too many boundaries to handle\n");

exit(1);

}

*content_top = boundary;

boundary = NULL;

}

slurp_attr(line->buf, "charset=", &charset);

if (boundary) {

strbuf_release(boundary);

free(boundary);

}

}

static void handle_content_transfer_encoding(const struct strbuf *line)

{

if (strcasestr(line->buf, "base64"))

transfer_encoding = TE_BASE64;

else if (strcasestr(line->buf, "quoted-printable"))

transfer_encoding = TE_QP;

else

transfer_encoding = TE_DONTCARE;

}

static int is_multipart_boundary(const struct strbuf *line)

{

return (((*content_top)->len <= line->len) &&

!memcmp(line->buf, (*content_top)->buf, (*content_top)->len));

}

static void cleanup_subject(struct strbuf *subject)

{

char *pos;

size_t remove;

while (subject->len) {

switch (*subject->buf) {

case 'r': case 'R':

if (subject->len <= 3)

break;

if (!memcmp(subject->buf + 1, "e:", 2)) {

strbuf_remove(subject, 0, 3);

continue;

}

break;

case ' ': case '\t': case ':':

strbuf_remove(subject, 0, 1);

continue;

case '[':

if ((pos = strchr(subject->buf, ']'))) {

remove = pos - subject->buf;

if (remove <= (subject->len - remove) * 2) {

strbuf_remove(subject, 0, remove + 1);

continue;

}

} else

strbuf_remove(subject, 0, 1);

break;

}

strbuf_trim(subject);

return;

}

}

static void cleanup_space(struct strbuf *sb)

{

size_t pos, cnt;

for (pos = 0; pos < sb->len; pos++) {

if (isspace(sb->buf[pos])) {

sb->buf[pos] = ' ';

for (cnt = 0; isspace(sb->buf[pos + cnt + 1]); cnt++);

strbuf_remove(sb, pos + 1, cnt);

}

}

}

static void decode_header(struct strbuf *line);

static const char *header[MAX_HDR_PARSED] = {

"From","Subject","Date",

};

static inline int cmp_header(const struct strbuf *line, const char *hdr)

{

int len = strlen(hdr);

return !strncasecmp(line->buf, hdr, len) && line->len > len &&

line->buf[len] == ':' && isspace(line->buf[len + 1]);

}

static int check_header(const struct strbuf *line,

struct strbuf *hdr_data[], int overwrite)

{

int i, ret = 0, len;

struct strbuf sb = STRBUF_INIT;

/* search for the interesting parts */

for (i = 0; header[i]; i++) {

int len = strlen(header[i]);

if ((!hdr_data[i] || overwrite) && cmp_header(line, header[i])) {

/* Unwrap inline B and Q encoding, and optionally

* normalize the meta information to utf8.

*/

strbuf_add(&sb, line->buf + len + 2, line->len - len - 2);

decode_header(&sb);

handle_header(&hdr_data[i], &sb);

ret = 1;

goto check_header_out;

}

}

/* Content stuff */

if (cmp_header(line, "Content-Type")) {

len = strlen("Content-Type: ");

strbuf_add(&sb, line->buf + len, line->len - len);

decode_header(&sb);

strbuf_insert(&sb, 0, "Content-Type: ", len);

handle_content_type(&sb);

ret = 1;

goto check_header_out;

}

if (cmp_header(line, "Content-Transfer-Encoding")) {

len = strlen("Content-Transfer-Encoding: ");

strbuf_add(&sb, line->buf + len, line->len - len);

decode_header(&sb);

handle_content_transfer_encoding(&sb);

ret = 1;

goto check_header_out;

}

/* for inbody stuff */

if (!prefixcmp(line->buf, ">From") && isspace(line->buf[5])) {

ret = 1; /* Should this return 0? */

goto check_header_out;

}

if (!prefixcmp(line->buf, "[PATCH]") && isspace(line->buf[7])) {

for (i = 0; header[i]; i++) {

if (!memcmp("Subject", header[i], 7)) {

handle_header(&hdr_data[i], line);

ret = 1;

goto check_header_out;

}

}

}

check_header_out:

strbuf_release(&sb);

return ret;

}

static int is_rfc2822_header(const struct strbuf *line)

{

/*

* The section that defines the loosest possible

* field name is "3.6.8 Optional fields".

*

* optional-field = field-name ":" unstructured CRLF

* field-name = 1*ftext

* ftext = %d33-57 / %59-126

*/

int ch;

char *cp = line->buf;

/* Count mbox From headers as headers */

if (!prefixcmp(cp, "From ") || !prefixcmp(cp, ">From "))

return 1;

while ((ch = *cp++)) {

if (ch == ':')

return 1;

if ((33 <= ch && ch <= 57) ||

(59 <= ch && ch <= 126))

continue;

break;

}

return 0;

}

static int read_one_header_line(struct strbuf *line, FILE *in)

{

/* Get the first part of the line. */

if (strbuf_getline(line, in, '\n'))

return 0;

/*

* Is it an empty line or not a valid rfc2822 header?

* If so, stop here, and return false ("not a header")

*/

strbuf_rtrim(line);

if (!line->len || !is_rfc2822_header(line)) {

/* Re-add the newline */

strbuf_addch(line, '\n');

return 0;

}

/*

* Now we need to eat all the continuation lines..

* Yuck, 2822 header "folding"

*/

for (;;) {

int peek;

struct strbuf continuation = STRBUF_INIT;

peek = fgetc(in); ungetc(peek, in);

if (peek != ' ' && peek != '\t')

break;

if (strbuf_getline(&continuation, in, '\n'))

break;

continuation.buf[0] = '\n';

strbuf_rtrim(&continuation);

strbuf_addbuf(line, &continuation);

}

return 1;

}

static struct strbuf *decode_q_segment(const struct strbuf *q_seg, int rfc2047)

{

const char *in = q_seg->buf;

int c;

struct strbuf *out = xmalloc(sizeof(struct strbuf));

strbuf_init(out, q_seg->len);

while ((c = *in++) != 0) {

if (c == '=') {

int d = *in++;

if (d == '\n' || !d)

break; /* drop trailing newline */

strbuf_addch(out, (hexval(d) << 4) | hexval(*in++));

continue;

}

if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */

c = 0x20;

strbuf_addch(out, c);

}

return out;

}

static struct strbuf *decode_b_segment(const struct strbuf *b_seg)

{

/* Decode in..ep, possibly in-place to ot */

int c, pos = 0, acc = 0;

const char *in = b_seg->buf;

struct strbuf *out = xmalloc(sizeof(struct strbuf));

strbuf_init(out, b_seg->len);

while ((c = *in++) != 0) {

if (c == '+')

c = 62;

else if (c == '/')

c = 63;

else if ('A' <= c && c <= 'Z')

c -= 'A';

else if ('a' <= c && c <= 'z')

c -= 'a' - 26;

else if ('0' <= c && c <= '9')

c -= '0' - 52;

else

continue; /* garbage */

switch (pos++) {

case 0:

acc = (c << 2);

break;

case 1:

strbuf_addch(out, (acc | (c >> 4)));

acc = (c & 15) << 4;

break;

case 2:

strbuf_addch(out, (acc | (c >> 2)));

acc = (c & 3) << 6;

break;

case 3:

strbuf_addch(out, (acc | c));

acc = pos = 0;

break;

}

}

return out;

}

/*

* When there is no known charset, guess.

*

* Right now we assume that if the target is UTF-8 (the default),

* and it already looks like UTF-8 (which includes US-ASCII as its

* subset, of course) then that is what it is and there is nothing

* to do.

*

* Otherwise, we default to assuming it is Latin1 for historical

* reasons.

*/

static const char *guess_charset(const struct strbuf *line, const char *target_charset)

{

if (is_encoding_utf8(target_charset)) {

if (is_utf8(line->buf))

return NULL;

}

return "ISO8859-1";

}

static void convert_to_utf8(struct strbuf *line, const char *charset)

{

char *out;

if (!charset || !*charset) {

charset = guess_charset(line, metainfo_charset);

if (!charset)

return;

}

if (!strcasecmp(metainfo_charset, charset))

return;

out = reencode_string(line->buf, metainfo_charset, charset);

if (!out)

die("cannot convert from %s to %s",

charset, metainfo_charset);

strbuf_attach(line, out, strlen(out), strlen(out));

}

static int decode_header_bq(struct strbuf *it)

{

char *in, *ep, *cp;

struct strbuf outbuf = STRBUF_INIT, *dec;

struct strbuf charset_q = STRBUF_INIT, piecebuf = STRBUF_INIT;

int rfc2047 = 0;

in = it->buf;

while (in - it->buf <= it->len && (ep = strstr(in, "=?")) != NULL) {

int encoding;

strbuf_reset(&charset_q);

strbuf_reset(&piecebuf);

rfc2047 = 1;

if (in != ep) {

/*

* We are about to process an encoded-word

* that begins at ep, but there is something

* before the encoded word.

*/

char *scan;

for (scan = in; scan < ep; scan++)

if (!isspace(*scan))

break;

if (scan != ep || in == it->buf) {

/*

* We should not lose that "something",

* unless we have just processed an

* encoded-word, and there is only LWS

* before the one we are about to process.

*/

strbuf_add(&outbuf, in, ep - in);

}

}

/* E.g.

* ep : "=?iso-2022-jp?B?GyR...?= foo"

* ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"

*/

ep += 2;

if (ep - it->buf >= it->len || !(cp = strchr(ep, '?')))

goto decode_header_bq_out;

if (cp + 3 - it->buf > it->len)

goto decode_header_bq_out;

strbuf_add(&charset_q, ep, cp - ep);

encoding = cp[1];

if (!encoding || cp[2] != '?')

goto decode_header_bq_out;

ep = strstr(cp + 3, "?=");

if (!ep)

goto decode_header_bq_out;

strbuf_add(&piecebuf, cp + 3, ep - cp - 3);

switch (tolower(encoding)) {

default:

goto decode_header_bq_out;

case 'b':

dec = decode_b_segment(&piecebuf);

break;

case 'q':

dec = decode_q_segment(&piecebuf, 1);

break;

}

if (metainfo_charset)

convert_to_utf8(dec, charset_q.buf);

strbuf_addbuf(&outbuf, dec);

strbuf_release(dec);

free(dec);

in = ep + 2;

}

strbuf_addstr(&outbuf, in);

strbuf_reset(it);

strbuf_addbuf(it, &outbuf);

decode_header_bq_out:

strbuf_release(&outbuf);

strbuf_release(&charset_q);

strbuf_release(&piecebuf);

return rfc2047;

}

static void decode_header(struct strbuf *it)

{

if (decode_header_bq(it))

return;

/* otherwise "it" is a straight copy of the input.

* This can be binary guck but there is no charset specified.

*/

if (metainfo_charset)

convert_to_utf8(it, "");

}

static void decode_transfer_encoding(struct strbuf *line)

{

struct strbuf *ret;

switch (transfer_encoding) {

case TE_QP:

ret = decode_q_segment(line, 0);

break;

case TE_BASE64:

ret = decode_b_segment(line);

break;

case TE_DONTCARE:

default:

return;

}

strbuf_reset(line);

strbuf_addbuf(line, ret);

strbuf_release(ret);

free(ret);

}

static void handle_filter(struct strbuf *line);

static int find_boundary(void)

{

while (!strbuf_getline(&line, fin, '\n')) {

if (*content_top && is_multipart_boundary(&line))

return 1;

}

return 0;

}

static int handle_boundary(void)

{

struct strbuf newline = STRBUF_INIT;

strbuf_addch(&newline, '\n');

again:

if (line.len >= (*content_top)->len + 2 &&

!memcmp(line.buf + (*content_top)->len, "--", 2)) {

/* we hit an end boundary */

/* pop the current boundary off the stack */

strbuf_release(*content_top);

free(*content_top);

*content_top = NULL;

/* technically won't happen as is_multipart_boundary()

will fail first. But just in case..

*/

if (--content_top < content) {

fprintf(stderr, "Detected mismatched boundaries, "

"can't recover\n");

exit(1);

}

handle_filter(&newline);

strbuf_release(&newline);

/* skip to the next boundary */

if (!find_boundary())

return 0;

goto again;

}

/* set some defaults */

transfer_encoding = TE_DONTCARE;

strbuf_reset(&charset);

message_type = TYPE_TEXT;

/* slurp in this section's info */

while (read_one_header_line(&line, fin))

check_header(&line, p_hdr_data, 0);

strbuf_release(&newline);

/* replenish line */

if (strbuf_getline(&line, fin, '\n'))

return 0;

strbuf_addch(&line, '\n');

return 1;

}

static inline int patchbreak(const struct strbuf *line)

{

size_t i;

/* Beginning of a "diff -" header? */

if (!prefixcmp(line->buf, "diff -"))

return 1;

/* CVS "Index: " line? */

if (!prefixcmp(line->buf, "Index: "))

return 1;

/*

* "--- <filename>" starts patches without headers

* "---<sp>*" is a manual separator

*/

if (line->len < 4)

return 0;

if (!prefixcmp(line->buf, "---")) {

/* space followed by a filename? */

if (line->buf[3] == ' ' && !isspace(line->buf[4]))

return 1;

/* Just whitespace? */

for (i = 3; i < line->len; i++) {

unsigned char c = line->buf[i];

if (c == '\n')

return 1;

if (!isspace(c))

break;

}

return 0;

}

return 0;

}

static int is_scissors_line(const struct strbuf *line)

{

size_t i, len = line->len;

int scissors = 0, gap = 0;

int first_nonblank = -1;

int last_nonblank = 0, visible, perforation = 0, in_perforation = 0;

const char *buf = line->buf;

for (i = 0; i < len; i++) {

if (isspace(buf[i])) {

if (in_perforation) {

perforation++;

gap++;

}

continue;

}

last_nonblank = i;

if (first_nonblank < 0)

first_nonblank = i;

if (buf[i] == '-') {

in_perforation = 1;

perforation++;

continue;

}

if (i + 1 < len &&

(!memcmp(buf + i, ">8", 2) || !memcmp(buf + i, "8<", 2))) {

in_perforation = 1;

perforation += 2;

scissors += 2;

i++;

continue;

}

in_perforation = 0;

}

/*

* The mark must be at least 8 bytes long (e.g. "-- >8 --").

* Even though there can be arbitrary cruft on the same line

* (e.g. "cut here"), in order to avoid misidentification, the

* perforation must occupy more than a third of the visible

* width of the line, and dashes and scissors must occupy more

* than half of the perforation.

*/

visible = last_nonblank - first_nonblank + 1;

return (scissors && 8 <= visible &&

visible < perforation * 3 &&

gap * 2 < perforation);

}

static int handle_commit_msg(struct strbuf *line)

{

static int still_looking = 1;

if (!cmitmsg)

return 0;

if (still_looking) {

strbuf_ltrim(line);

if (!line->len)

return 0;

still_looking = check_header(line, s_hdr_data, 0);

if (still_looking)

return 0;

}

/* normalize the log message to UTF-8. */

if (metainfo_charset)

convert_to_utf8(line, charset.buf);

if (use_scissors && is_scissors_line(line)) {

int i;

rewind(cmitmsg);

ftruncate(fileno(cmitmsg), 0);

still_looking = 1;

/*

* We may have already read "secondary headers"; purge

* them to give ourselves a clean restart.

*/

for (i = 0; header[i]; i++) {

if (s_hdr_data[i])

strbuf_release(s_hdr_data[i]);

s_hdr_data[i] = NULL;

}

return 0;

}

if (patchbreak(line)) {

fclose(cmitmsg);

cmitmsg = NULL;

return 1;

}

fputs(line->buf, cmitmsg);

return 0;

}

static void handle_patch(const struct strbuf *line)

{

fwrite(line->buf, 1, line->len, patchfile);

patch_lines++;

}

static void handle_filter(struct strbuf *line)

{

static int filter = 0;

/* filter tells us which part we left off on */

switch (filter) {

case 0:

if (!handle_commit_msg(line))

break;

filter++;

case 1:

handle_patch(line);

break;

}

}

static void handle_body(void)

{

struct strbuf prev = STRBUF_INIT;

/* Skip up to the first boundary */

if (*content_top) {

if (!find_boundary())

goto handle_body_out;

}

do {

/* process any boundary lines */

if (*content_top && is_multipart_boundary(&line)) {

/* flush any leftover */

if (prev.len) {

handle_filter(&prev);

strbuf_reset(&prev);

}

if (!handle_boundary())

goto handle_body_out;

}

/* Unwrap transfer encoding */

decode_transfer_encoding(&line);

switch (transfer_encoding) {

case TE_BASE64:

case TE_QP:

{

struct strbuf **lines, **it, *sb;

/* Prepend any previous partial lines */

strbuf_insert(&line, 0, prev.buf, prev.len);

strbuf_reset(&prev);

/* binary data most likely doesn't have newlines */

if (message_type != TYPE_TEXT) {

handle_filter(&line);

break;

}

/*

* This is a decoded line that may contain

* multiple new lines. Pass only one chunk

* at a time to handle_filter()

*/

lines = strbuf_split(&line, '\n');

for (it = lines; (sb = *it); it++) {

if (*(it + 1) == NULL) /* The last line */

if (sb->buf[sb->len - 1] != '\n') {

/* Partial line, save it for later. */

strbuf_addbuf(&prev, sb);

break;

}

handle_filter(sb);

}

/*

* The partial chunk is saved in "prev" and will be

* appended by the next iteration of read_line_with_nul().

*/

strbuf_list_free(lines);

break;

}

default:

handle_filter(&line);

}

} while (!strbuf_getwholeline(&line, fin, '\n'));

handle_body_out:

strbuf_release(&prev);

}

static void output_header_lines(FILE *fout, const char *hdr, const struct strbuf *data)

{

const char *sp = data->buf;

while (1) {

char *ep = strchr(sp, '\n');

int len;

if (!ep)

len = strlen(sp);

else

len = ep - sp;

fprintf(fout, "%s: %.*s\n", hdr, len, sp);

if (!ep)

break;

sp = ep + 1;

}

}

static void handle_info(void)

{

struct strbuf *hdr;

int i;

for (i = 0; header[i]; i++) {

/* only print inbody headers if we output a patch file */

if (patch_lines && s_hdr_data[i])

hdr = s_hdr_data[i];

else if (p_hdr_data[i])

hdr = p_hdr_data[i];

else

continue;

if (!memcmp(header[i], "Subject", 7)) {

if (!keep_subject) {

cleanup_subject(hdr);

cleanup_space(hdr);

}

output_header_lines(fout, "Subject", hdr);

} else if (!memcmp(header[i], "From", 4)) {

cleanup_space(hdr);

handle_from(hdr);

fprintf(fout, "Author: %s\n", name.buf);

fprintf(fout, "Email: %s\n", email.buf);

} else {

cleanup_space(hdr);

fprintf(fout, "%s: %s\n", header[i], hdr->buf);

}

}

fprintf(fout, "\n");

}

static int mailinfo(FILE *in, FILE *out, const char *msg, const char *patch)

{

int peek;

fin = in;

fout = out;

cmitmsg = fopen(msg, "w");

if (!cmitmsg) {

perror(msg);

return -1;

}

patchfile = fopen(patch, "w");

if (!patchfile) {

perror(patch);

fclose(cmitmsg);

return -1;

}

p_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*p_hdr_data));

s_hdr_data = xcalloc(MAX_HDR_PARSED, sizeof(*s_hdr_data));

do {

peek = fgetc(in);

} while (isspace(peek));

ungetc(peek, in);

/* process the email header */

while (read_one_header_line(&line, fin))

check_header(&line, p_hdr_data, 1);

handle_body();

handle_info();

return 0;

}

static int git_mailinfo_config(const char *var, const char *value, void *unused)

{

if (prefixcmp(var, "mailinfo."))

return git_default_config(var, value, unused);

if (!strcmp(var, "mailinfo.scissors")) {

use_scissors = git_config_bool(var, value);

return 0;