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![René Scharfe](/assets/img/avatar_default.png)
Add the option -W/--function-context to git diff. It is similar to the same option of git grep and expands the context of change hunks so that the whole surrounding function is shown. This "natural" context can allow changes to be understood better. Note: GNU patch doesn't like diffs generated with the new option; it seems to expect context lines to be the same before and after changes. git apply doesn't complain. This implementation has the same shortcoming as the one in grep, namely that there is no way to explicitly find the end of a function. That means that a few lines of extra context are shown, right up to the next recognized function begins. It's already useful in its current form, though. The function get_func_line() in xdiff/xemit.c is extended to work forward as well as backward to find post-context as well as pre-context. It returns the position of the first found matching line. The func_line parameter is made optional, as we don't need it for -W. The enhanced function is then used in xdl_emit_diff() to extend the context as needed. If the added context overlaps with the next change, it is merged into the current hunk. Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: Junio C Hamano <gitster@pobox.com>
249 lines
6 KiB
C
249 lines
6 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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*/
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xdchange_t *xdl_get_hunk(xdchange_t *xscr, xdemitconf_t const *xecfg) {
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xdchange_t *xch, *xchp;
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long max_common = 2 * xecfg->ctxlen + xecfg->interhunkctxlen;
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for (xchp = xscr, xch = xscr->next; xch; xchp = xch, xch = xch->next)
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if (xch->i1 - (xchp->i1 + xchp->chg1) > max_common)
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break;
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return xchp;
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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->xdf1;
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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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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 (; s1 < xch->i1; s1++)
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if (xdl_emit_record(&xe->xdf1, s1, " ", 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->xdf1, s1, " ", 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 (s1 = xche->i1 + xche->chg1; s1 < e1; 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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return 0;
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}
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