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36617af7ed
The goal of the patch is to introduce the GNU diff -B/--ignore-blank-lines as closely as possible. The short option is not available because it's already used for "break-rewrites". When this option is used, git-diff will not create hunks that simply add or remove empty lines, but will still show empty lines addition/suppression if they are close enough to "valuable" changes. There are two differences between this option and GNU diff -B option: - GNU diff doesn't have "--inter-hunk-context", so this must be handled - The following sequence looks like a bug (context is displayed twice): $ seq 5 >file1 $ cat <<EOF >file2 change 1 2 3 4 5 change EOF $ diff -u -B file1 file2 --- file1 2013-06-08 22:13:04.471517834 +0200 +++ file2 2013-06-08 22:13:23.275517855 +0200 @@ -1,5 +1,7 @@ +change 1 2 + 3 4 5 @@ -3,3 +5,4 @@ 3 4 5 +change So here is a more thorough description of the option: - real changes are interesting - blank lines that are close enough (less than context size) to interesting changes are considered interesting (recursive definition) - "context" lines are used around each hunk of interesting changes - If two hunks are separated by less than "inter-hunk-context", they will be merged into one. The implementation does the "interesting changes selection" in a single pass. Signed-off-by: Antoine Pelisse <apelisse@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
285 lines
6.9 KiB
C
285 lines
6.9 KiB
C
/*
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* LibXDiff by Davide Libenzi ( File Differential Library )
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* Copyright (C) 2003 Davide Libenzi
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Davide Libenzi <davidel@xmailserver.org>
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*
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*/
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#include "xinclude.h"
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static long xdl_get_rec(xdfile_t *xdf, long ri, char const **rec);
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static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb);
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static long xdl_get_rec(xdfile_t *xdf, long ri, char const **rec) {
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*rec = xdf->recs[ri]->ptr;
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return xdf->recs[ri]->size;
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}
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static int xdl_emit_record(xdfile_t *xdf, long ri, char const *pre, xdemitcb_t *ecb) {
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long size, psize = strlen(pre);
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char const *rec;
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size = xdl_get_rec(xdf, ri, &rec);
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if (xdl_emit_diffrec(rec, size, pre, psize, ecb) < 0) {
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return -1;
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}
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return 0;
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}
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/*
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* Starting at the passed change atom, find the latest change atom to be included
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* inside the differential hunk according to the specified configuration.
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* Also advance xscr if the first changes must be discarded.
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*/
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xdchange_t *xdl_get_hunk(xdchange_t **xscr, xdemitconf_t const *xecfg)
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{
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xdchange_t *xch, *xchp, *lxch;
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long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
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long max_ignorable = xecfg->ctxlen;
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unsigned long ignored = 0; /* number of ignored blank lines */
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/* remove ignorable changes that are too far before other changes */
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for (xchp = *xscr; xchp && xchp->ignore; xchp = xchp->next) {
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xch = xchp->next;
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if (xch == NULL ||
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xch->i1 - (xchp->i1 + xchp->chg1) >= max_ignorable)
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*xscr = xch;
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}
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if (*xscr == NULL)
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return NULL;
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lxch = *xscr;
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for (xchp = *xscr, xch = xchp->next; xch; xchp = xch, xch = xch->next) {
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long distance = xch->i1 - (xchp->i1 + xchp->chg1);
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if (distance > max_common)
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break;
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if (distance < max_ignorable && (!xch->ignore || lxch == xchp)) {
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lxch = xch;
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ignored = 0;
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} else if (distance < max_ignorable && xch->ignore) {
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ignored += xch->chg2;
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} else if (lxch != xchp &&
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xch->i1 + ignored - (lxch->i1 + lxch->chg1) > max_common) {
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break;
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} else if (!xch->ignore) {
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lxch = xch;
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ignored = 0;
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} else {
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ignored += xch->chg2;
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}
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}
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return lxch;
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}
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static long def_ff(const char *rec, long len, char *buf, long sz, void *priv)
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{
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if (len > 0 &&
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(isalpha((unsigned char)*rec) || /* identifier? */
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*rec == '_' || /* also identifier? */
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*rec == '$')) { /* identifiers from VMS and other esoterico */
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if (len > sz)
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len = sz;
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while (0 < len && isspace((unsigned char)rec[len - 1]))
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len--;
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memcpy(buf, rec, len);
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return len;
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}
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return -1;
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}
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static int xdl_emit_common(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
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xdemitconf_t const *xecfg) {
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xdfile_t *xdf = &xe->xdf2;
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const char *rchg = xdf->rchg;
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long ix;
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for (ix = 0; ix < xdf->nrec; ix++) {
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if (rchg[ix])
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continue;
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if (xdl_emit_record(xdf, ix, "", ecb))
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return -1;
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}
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return 0;
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}
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struct func_line {
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long len;
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char buf[80];
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};
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static long get_func_line(xdfenv_t *xe, xdemitconf_t const *xecfg,
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struct func_line *func_line, long start, long limit)
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{
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find_func_t ff = xecfg->find_func ? xecfg->find_func : def_ff;
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long l, size, step = (start > limit) ? -1 : 1;
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char *buf, dummy[1];
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buf = func_line ? func_line->buf : dummy;
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size = func_line ? sizeof(func_line->buf) : sizeof(dummy);
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for (l = start; l != limit && 0 <= l && l < xe->xdf1.nrec; l += step) {
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const char *rec;
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long reclen = xdl_get_rec(&xe->xdf1, l, &rec);
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long len = ff(rec, reclen, buf, size, xecfg->find_func_priv);
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if (len >= 0) {
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if (func_line)
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func_line->len = len;
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return l;
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}
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}
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return -1;
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}
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int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
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xdemitconf_t const *xecfg) {
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long s1, s2, e1, e2, lctx;
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xdchange_t *xch, *xche;
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long funclineprev = -1;
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struct func_line func_line = { 0 };
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if (xecfg->flags & XDL_EMIT_COMMON)
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return xdl_emit_common(xe, xscr, ecb, xecfg);
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for (xch = xscr; xch; xch = xche->next) {
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xche = xdl_get_hunk(&xch, xecfg);
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if (!xch)
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break;
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s1 = XDL_MAX(xch->i1 - xecfg->ctxlen, 0);
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s2 = XDL_MAX(xch->i2 - xecfg->ctxlen, 0);
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if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
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long fs1 = get_func_line(xe, xecfg, NULL, xch->i1, -1);
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if (fs1 < 0)
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fs1 = 0;
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if (fs1 < s1) {
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s2 -= s1 - fs1;
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s1 = fs1;
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}
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}
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again:
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lctx = xecfg->ctxlen;
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lctx = XDL_MIN(lctx, xe->xdf1.nrec - (xche->i1 + xche->chg1));
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lctx = XDL_MIN(lctx, xe->xdf2.nrec - (xche->i2 + xche->chg2));
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e1 = xche->i1 + xche->chg1 + lctx;
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e2 = xche->i2 + xche->chg2 + lctx;
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if (xecfg->flags & XDL_EMIT_FUNCCONTEXT) {
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long fe1 = get_func_line(xe, xecfg, NULL,
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xche->i1 + xche->chg1,
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xe->xdf1.nrec);
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if (fe1 < 0)
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fe1 = xe->xdf1.nrec;
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if (fe1 > e1) {
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e2 += fe1 - e1;
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e1 = fe1;
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}
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/*
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* Overlap with next change? Then include it
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* in the current hunk and start over to find
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* its new end.
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*/
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if (xche->next) {
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long l = xche->next->i1;
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if (l <= e1 ||
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get_func_line(xe, xecfg, NULL, l, e1) < 0) {
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xche = xche->next;
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goto again;
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}
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}
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}
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/*
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* Emit current hunk header.
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*/
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if (xecfg->flags & XDL_EMIT_FUNCNAMES) {
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get_func_line(xe, xecfg, &func_line,
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s1 - 1, funclineprev);
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funclineprev = s1 - 1;
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}
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if (xdl_emit_hunk_hdr(s1 + 1, e1 - s1, s2 + 1, e2 - s2,
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func_line.buf, func_line.len, ecb) < 0)
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return -1;
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/*
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* Emit pre-context.
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*/
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for (; s2 < xch->i2; s2++)
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if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
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return -1;
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for (s1 = xch->i1, s2 = xch->i2;; xch = xch->next) {
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/*
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* Merge previous with current change atom.
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*/
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for (; s1 < xch->i1 && s2 < xch->i2; s1++, s2++)
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if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
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return -1;
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/*
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* Removes lines from the first file.
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*/
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for (s1 = xch->i1; s1 < xch->i1 + xch->chg1; s1++)
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if (xdl_emit_record(&xe->xdf1, s1, "-", ecb) < 0)
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return -1;
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/*
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* Adds lines from the second file.
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*/
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for (s2 = xch->i2; s2 < xch->i2 + xch->chg2; s2++)
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if (xdl_emit_record(&xe->xdf2, s2, "+", ecb) < 0)
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return -1;
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if (xch == xche)
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break;
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s1 = xch->i1 + xch->chg1;
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s2 = xch->i2 + xch->chg2;
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}
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/*
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* Emit post-context.
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*/
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for (s2 = xche->i2 + xche->chg2; s2 < e2; s2++)
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if (xdl_emit_record(&xe->xdf2, s2, " ", ecb) < 0)
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return -1;
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}
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return 0;
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}
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