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-rw-r--r--.gitignore1
-rw-r--r--Documentation/git-merge-index.txt4
-rw-r--r--INSTALL9
-rw-r--r--Makefile4
-rw-r--r--builtin-merge-file.c79
-rw-r--r--builtin.h1
-rwxr-xr-xgit-cvsserver.perl2
-rwxr-xr-xgit-rerere.perl2
-rw-r--r--git.c1
-rw-r--r--git.spec.in2
-rw-r--r--merge-file.c75
-rw-r--r--merge-recursive.c98
-rwxr-xr-xt/t0000-basic.sh14
-rw-r--r--t/t6023-merge-file.sh116
-rw-r--r--xdiff/xdiff.h7
-rw-r--r--xdiff/xdiffi.c3
-rw-r--r--xdiff/xdiffi.h1
-rw-r--r--xdiff/xmerge.c419
18 files changed, 689 insertions, 149 deletions
diff --git a/.gitignore b/.gitignore
index 7f2cd55..d706dd9 100644
--- a/.gitignore
+++ b/.gitignore
@@ -60,6 +60,7 @@ git-mailsplit
git-merge
git-merge-base
git-merge-index
+git-merge-file
git-merge-tree
git-merge-octopus
git-merge-one-file
diff --git a/Documentation/git-merge-index.txt b/Documentation/git-merge-index.txt
index 6cd0601..0cf505e 100644
--- a/Documentation/git-merge-index.txt
+++ b/Documentation/git-merge-index.txt
@@ -40,8 +40,8 @@ If "git-merge-index" is called with multiple <file>s (or -a) then it
processes them in turn only stopping if merge returns a non-zero exit
code.
-Typically this is run with the a script calling the merge command from
-the RCS package.
+Typically this is run with the a script calling git's imitation of
+the merge command from the RCS package.
A sample script called "git-merge-one-file" is included in the
distribution.
diff --git a/INSTALL b/INSTALL
index 8f69039..b5dd9f0 100644
--- a/INSTALL
+++ b/INSTALL
@@ -82,15 +82,6 @@ Issues of note:
do that even if it wasn't for git. There's no point in living
in the dark ages any more.
- - "merge", the standard UNIX three-way merge program. It usually
- comes with the "rcs" package on most Linux distributions, so if
- you have a developer install you probably have it already, but a
- "graphical user desktop" install might have left it out.
-
- You'll only need the merge program if you do development using
- git, and if you only use git to track other peoples work you'll
- never notice the lack of it.
-
- "wish", the Tcl/Tk windowing shell is used in gitk to show the
history graphically
diff --git a/Makefile b/Makefile
index 906e984..2d17fa7 100644
--- a/Makefile
+++ b/Makefile
@@ -279,6 +279,7 @@ BUILTIN_OBJS = \
builtin-ls-tree.o \
builtin-mailinfo.o \
builtin-mailsplit.o \
+ builtin-merge-file.o \
builtin-mv.o \
builtin-name-rev.o \
builtin-pack-objects.o \
@@ -737,7 +738,8 @@ $(DIFF_OBJS): diffcore.h
$(LIB_FILE): $(LIB_OBJS)
rm -f $@ && $(AR) rcs $@ $(LIB_OBJS)
-XDIFF_OBJS=xdiff/xdiffi.o xdiff/xprepare.o xdiff/xutils.o xdiff/xemit.o
+XDIFF_OBJS=xdiff/xdiffi.o xdiff/xprepare.o xdiff/xutils.o xdiff/xemit.o \
+ xdiff/xmerge.o
$(XDIFF_OBJS): xdiff/xinclude.h xdiff/xmacros.h xdiff/xdiff.h xdiff/xtypes.h \
xdiff/xutils.h xdiff/xprepare.h xdiff/xdiffi.h xdiff/xemit.h
diff --git a/builtin-merge-file.c b/builtin-merge-file.c
new file mode 100644
index 0000000..6c4c3a3
--- /dev/null
+++ b/builtin-merge-file.c
@@ -0,0 +1,79 @@
+#include "cache.h"
+#include "xdiff/xdiff.h"
+
+static const char merge_file_usage[] =
+"git merge-file [-p | --stdout] [-q | --quiet] [-L name1 [-L orig [-L name2]]] file1 orig_file file2";
+
+static int read_file(mmfile_t *ptr, const char *filename)
+{
+ struct stat st;
+ FILE *f;
+
+ if (stat(filename, &st))
+ return error("Could not stat %s", filename);
+ if ((f = fopen(filename, "rb")) == NULL)
+ return error("Could not open %s", filename);
+ ptr->ptr = xmalloc(st.st_size);
+ if (fread(ptr->ptr, st.st_size, 1, f) != 1)
+ return error("Could not read %s", filename);
+ fclose(f);
+ ptr->size = st.st_size;
+ return 0;
+}
+
+int cmd_merge_file(int argc, char **argv, char **envp)
+{
+ char *names[3];
+ mmfile_t mmfs[3];
+ mmbuffer_t result = {NULL, 0};
+ xpparam_t xpp = {XDF_NEED_MINIMAL};
+ int ret = 0, i = 0, to_stdout = 0;
+
+ while (argc > 4) {
+ if (!strcmp(argv[1], "-L") && i < 3) {
+ names[i++] = argv[2];
+ argc--;
+ argv++;
+ } else if (!strcmp(argv[1], "-p") ||
+ !strcmp(argv[1], "--stdout"))
+ to_stdout = 1;
+ else if (!strcmp(argv[1], "-q") ||
+ !strcmp(argv[1], "--quiet"))
+ freopen("/dev/null", "w", stderr);
+ else
+ usage(merge_file_usage);
+ argc--;
+ argv++;
+ }
+
+ if (argc != 4)
+ usage(merge_file_usage);
+
+ for (; i < 3; i++)
+ names[i] = argv[i + 1];
+
+ for (i = 0; i < 3; i++)
+ if (read_file(mmfs + i, argv[i + 1]))
+ return -1;
+
+ ret = xdl_merge(mmfs + 1, mmfs + 0, names[0], mmfs + 2, names[2],
+ &xpp, XDL_MERGE_ZEALOUS, &result);
+
+ for (i = 0; i < 3; i++)
+ free(mmfs[i].ptr);
+
+ if (ret >= 0) {
+ char *filename = argv[1];
+ FILE *f = to_stdout ? stdout : fopen(filename, "wb");
+
+ if (!f)
+ ret = error("Could not open %s for writing", filename);
+ else if (fwrite(result.ptr, result.size, 1, f) != 1)
+ ret = error("Could not write to %s", filename);
+ else if (fclose(f))
+ ret = error("Could not close %s", filename);
+ free(result.ptr);
+ }
+
+ return ret;
+}
diff --git a/builtin.h b/builtin.h
index b5116f3..08519e7 100644
--- a/builtin.h
+++ b/builtin.h
@@ -42,6 +42,7 @@ extern int cmd_ls_files(int argc, const char **argv, const char *prefix);
extern int cmd_ls_tree(int argc, const char **argv, const char *prefix);
extern int cmd_mailinfo(int argc, const char **argv, const char *prefix);
extern int cmd_mailsplit(int argc, const char **argv, const char *prefix);
+extern int cmd_merge_file(int argc, const char **argv, const char *prefix);
extern int cmd_mv(int argc, const char **argv, const char *prefix);
extern int cmd_name_rev(int argc, const char **argv, const char *prefix);
extern int cmd_pack_objects(int argc, const char **argv, const char *prefix);
diff --git a/git-cvsserver.perl b/git-cvsserver.perl
index 197014d..2a8447e 100755
--- a/git-cvsserver.perl
+++ b/git-cvsserver.perl
@@ -946,7 +946,7 @@ sub req_update
$log->debug("Temporary directory for merge is $dir");
- my $return = system("merge", $file_local, $file_old, $file_new);
+ my $return = system("git merge-file", $file_local, $file_old, $file_new);
$return >>= 8;
if ( $return == 0 )
diff --git a/git-rerere.perl b/git-rerere.perl
index d3664ff..2e8dbbd 100755
--- a/git-rerere.perl
+++ b/git-rerere.perl
@@ -154,7 +154,7 @@ sub find_conflict {
sub merge {
my ($name, $path) = @_;
record_preimage($path, "$rr_dir/$name/thisimage");
- unless (system('merge', map { "$rr_dir/$name/${_}image" }
+ unless (system('git merge-file', map { "$rr_dir/$name/${_}image" }
qw(this pre post))) {
my $in;
open $in, "<$rr_dir/$name/thisimage" or
diff --git a/git.c b/git.c
index 357330e..016ee8a 100644
--- a/git.c
+++ b/git.c
@@ -247,6 +247,7 @@ static void handle_internal_command(int argc, const char **argv, char **envp)
{ "ls-tree", cmd_ls_tree, RUN_SETUP },
{ "mailinfo", cmd_mailinfo },
{ "mailsplit", cmd_mailsplit },
+ { "merge-file", cmd_merge_file },
{ "mv", cmd_mv, RUN_SETUP },
{ "name-rev", cmd_name_rev, RUN_SETUP },
{ "pack-objects", cmd_pack_objects, RUN_SETUP },
diff --git a/git.spec.in b/git.spec.in
index f2374b7..fb95e37 100644
--- a/git.spec.in
+++ b/git.spec.in
@@ -24,7 +24,7 @@ This is a dummy package which brings in all subpackages.
%package core
Summary: Core git tools
Group: Development/Tools
-Requires: zlib >= 1.2, rsync, rcs, curl, less, openssh-clients, expat
+Requires: zlib >= 1.2, rsync, curl, less, openssh-clients, expat
%description core
This is a stupid (but extremely fast) directory content manager. It
doesn't do a whole lot, but what it _does_ do is track directory
diff --git a/merge-file.c b/merge-file.c
index fc9b148..69dc1eb 100644
--- a/merge-file.c
+++ b/merge-file.c
@@ -3,52 +3,6 @@
#include "xdiff-interface.h"
#include "blob.h"
-static void rm_temp_file(const char *filename)
-{
- unlink(filename);
- free((void *)filename);
-}
-
-static const char *write_temp_file(mmfile_t *f)
-{
- int fd;
- const char *tmp = getenv("TMPDIR");
- char *filename;
-
- if (!tmp)
- tmp = "/tmp";
- filename = mkpath("%s/%s", tmp, "git-tmp-XXXXXX");
- fd = mkstemp(filename);
- if (fd < 0)
- return NULL;
- filename = xstrdup(filename);
- if (f->size != xwrite(fd, f->ptr, f->size)) {
- rm_temp_file(filename);
- return NULL;
- }
- close(fd);
- return filename;
-}
-
-static void *read_temp_file(const char *filename, unsigned long *size)
-{
- struct stat st;
- char *buf = NULL;
- int fd = open(filename, O_RDONLY);
- if (fd < 0)
- return NULL;
- if (!fstat(fd, &st)) {
- *size = st.st_size;
- buf = xmalloc(st.st_size);
- if (st.st_size != xread(fd, buf, st.st_size)) {
- free(buf);
- buf = NULL;
- }
- }
- close(fd);
- return buf;
-}
-
static int fill_mmfile_blob(mmfile_t *f, struct blob *obj)
{
void *buf;
@@ -72,22 +26,19 @@ static void free_mmfile(mmfile_t *f)
static void *three_way_filemerge(mmfile_t *base, mmfile_t *our, mmfile_t *their, unsigned long *size)
{
- void *res;
- const char *t1, *t2, *t3;
-
- t1 = write_temp_file(base);
- t2 = write_temp_file(our);
- t3 = write_temp_file(their);
- res = NULL;
- if (t1 && t2 && t3) {
- int code = run_command("merge", t2, t1, t3, NULL);
- if (!code || code == -1)
- res = read_temp_file(t2, size);
- }
- rm_temp_file(t1);
- rm_temp_file(t2);
- rm_temp_file(t3);
- return res;
+ mmbuffer_t res;
+ xpparam_t xpp;
+ int merge_status;
+
+ memset(&xpp, 0, sizeof(xpp));
+ merge_status = xdl_merge(base, our, ".our", their, ".their",
+ &xpp, XDL_MERGE_ZEALOUS, &res);
+
+ if (merge_status < 0)
+ return NULL;
+
+ *size = res.size;
+ return res.ptr;
}
static int common_outf(void *priv_, mmbuffer_t *mb, int nbuf)
diff --git a/merge-recursive.c b/merge-recursive.c
index 32e186c..9d53bcd 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -21,6 +21,7 @@
#include "tag.h"
#include "unpack-trees.h"
#include "path-list.h"
+#include "xdiff-interface.h"
/*
* A virtual commit has
@@ -604,24 +605,15 @@ struct merge_file_info
merge:1;
};
-static char *git_unpack_file(const unsigned char *sha1, char *path)
+static void fill_mm(const unsigned char *sha1, mmfile_t *mm)
{
- void *buf;
- char type[20];
unsigned long size;
- int fd;
+ char type[20];
- buf = read_sha1_file(sha1, type, &size);
- if (!buf || strcmp(type, blob_type))
+ mm->ptr = read_sha1_file(sha1, type, &size);
+ if (!mm->ptr || strcmp(type, blob_type))
die("unable to read blob object %s", sha1_to_hex(sha1));
-
- strcpy(path, ".merge_file_XXXXXX");
- fd = mkstemp(path);
- if (fd < 0)
- die("unable to create temp-file");
- flush_buffer(fd, buf, size);
- close(fd);
- return path;
+ mm->size = size;
}
static struct merge_file_info merge_file(struct diff_filespec *o,
@@ -652,49 +644,41 @@ static struct merge_file_info merge_file(struct diff_filespec *o,
else if (sha_eq(b->sha1, o->sha1))
hashcpy(result.sha, a->sha1);
else if (S_ISREG(a->mode)) {
- int code = 1, fd;
- struct stat st;
- char orig[PATH_MAX];
- char src1[PATH_MAX];
- char src2[PATH_MAX];
- const char *argv[] = {
- "merge", "-L", NULL, "-L", NULL, "-L", NULL,
- NULL, NULL, NULL,
- NULL
- };
- char *la, *lb, *lo;
-
- git_unpack_file(o->sha1, orig);
- git_unpack_file(a->sha1, src1);
- git_unpack_file(b->sha1, src2);
-
- argv[2] = la = xstrdup(mkpath("%s/%s", branch1, a->path));
- argv[6] = lb = xstrdup(mkpath("%s/%s", branch2, b->path));
- argv[4] = lo = xstrdup(mkpath("orig/%s", o->path));
- argv[7] = src1;
- argv[8] = orig;
- argv[9] = src2,
-
- code = run_command_v(10, argv);
-
- free(la);
- free(lb);
- free(lo);
- if (code && code < -256) {
- die("Failed to execute 'merge'. merge(1) is used as the "
- "file-level merge tool. Is 'merge' in your path?");
- }
- fd = open(src1, O_RDONLY);
- if (fd < 0 || fstat(fd, &st) < 0 ||
- index_fd(result.sha, fd, &st, 1,
- "blob"))
- die("Unable to add %s to database", src1);
-
- unlink(orig);
- unlink(src1);
- unlink(src2);
-
- result.clean = WEXITSTATUS(code) == 0;
+ mmfile_t orig, src1, src2;
+ mmbuffer_t result_buf;
+ xpparam_t xpp;
+ char *name1, *name2;
+ int merge_status;
+
+ name1 = xstrdup(mkpath("%s/%s", branch1, a->path));
+ name2 = xstrdup(mkpath("%s/%s", branch2, b->path));
+
+ fill_mm(o->sha1, &orig);
+ fill_mm(a->sha1, &src1);
+ fill_mm(b->sha1, &src2);
+
+ memset(&xpp, 0, sizeof(xpp));
+ merge_status = xdl_merge(&orig,
+ &src1, name1,
+ &src2, name2,
+ &xpp, XDL_MERGE_ZEALOUS,
+ &result_buf);
+ free(name1);
+ free(name2);
+ free(orig.ptr);
+ free(src1.ptr);
+ free(src2.ptr);
+
+ if ((merge_status < 0) || !result_buf.ptr)
+ die("Failed to execute internal merge");
+
+ if (write_sha1_file(result_buf.ptr, result_buf.size,
+ blob_type, result.sha))
+ die("Unable to add %s to database",
+ a->path);
+
+ free(result_buf.ptr);
+ result.clean = (merge_status == 0);
} else {
if (!(S_ISLNK(a->mode) || S_ISLNK(b->mode)))
die("cannot merge modes?");
diff --git a/t/t0000-basic.sh b/t/t0000-basic.sh
index 81f3bed..3260d1d 100755
--- a/t/t0000-basic.sh
+++ b/t/t0000-basic.sh
@@ -19,11 +19,7 @@ modification *should* take notice and update the test vectors here.
'
################################################################
-# It appears that people are getting bitten by not installing
-# 'merge' (usually part of RCS package in binary distributions).
-# Check this and error out before running any tests. Also catch
-# the bogosity of trying to run tests without building while we
-# are at it.
+# It appears that people try to run tests without building...
../git >/dev/null
if test $? != 1
@@ -32,14 +28,6 @@ then
exit 1
fi
-merge >/dev/null 2>/dev/null
-if test $? = 127
-then
- echo >&2 'You do not seem to have "merge" installed.
-Please check INSTALL document.'
- exit 1
-fi
-
. ./test-lib.sh
################################################################
diff --git a/t/t6023-merge-file.sh b/t/t6023-merge-file.sh
new file mode 100644
index 0000000..5d9b6f3
--- /dev/null
+++ b/t/t6023-merge-file.sh
@@ -0,0 +1,116 @@
+#!/bin/sh
+
+test_description='RCS merge replacement: merge-file'
+. ./test-lib.sh
+
+cat > orig.txt << EOF
+Dominus regit me,
+et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+EOF
+
+cat > new1.txt << EOF
+Dominus regit me,
+et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+Nam et si ambulavero in medio umbrae mortis,
+non timebo mala, quoniam tu mecum es:
+virga tua et baculus tuus ipsa me consolata sunt.
+EOF
+
+cat > new2.txt << EOF
+Dominus regit me, et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+EOF
+
+cat > new3.txt << EOF
+DOMINUS regit me,
+et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+EOF
+
+cat > new4.txt << EOF
+Dominus regit me, et nihil mihi deerit.
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+EOF
+echo -n "propter nomen suum." >> new4.txt
+
+cp new1.txt test.txt
+test_expect_success "merge without conflict" \
+ "git-merge-file test.txt orig.txt new2.txt"
+
+cp new1.txt test2.txt
+test_expect_success "merge without conflict (missing LF at EOF)" \
+ "git-merge-file test2.txt orig.txt new2.txt"
+
+test_expect_success "merge result added missing LF" \
+ "diff -u test.txt test2.txt"
+
+cp test.txt backup.txt
+test_expect_failure "merge with conflicts" \
+ "git-merge-file test.txt orig.txt new3.txt"
+
+cat > expect.txt << EOF
+<<<<<<< test.txt
+Dominus regit me, et nihil mihi deerit.
+=======
+DOMINUS regit me,
+et nihil mihi deerit.
+>>>>>>> new3.txt
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+Nam et si ambulavero in medio umbrae mortis,
+non timebo mala, quoniam tu mecum es:
+virga tua et baculus tuus ipsa me consolata sunt.
+EOF
+
+test_expect_success "expected conflict markers" "diff -u test.txt expect.txt"
+
+cp backup.txt test.txt
+test_expect_failure "merge with conflicts, using -L" \
+ "git-merge-file -L 1 -L 2 test.txt orig.txt new3.txt"
+
+cat > expect.txt << EOF
+<<<<<<< 1
+Dominus regit me, et nihil mihi deerit.
+=======
+DOMINUS regit me,
+et nihil mihi deerit.
+>>>>>>> new3.txt
+In loco pascuae ibi me collocavit,
+super aquam refectionis educavit me;
+animam meam convertit,
+deduxit me super semitas jusitiae,
+propter nomen suum.
+Nam et si ambulavero in medio umbrae mortis,
+non timebo mala, quoniam tu mecum es:
+virga tua et baculus tuus ipsa me consolata sunt.
+EOF
+
+test_expect_success "expected conflict markers, with -L" \
+ "diff -u test.txt expect.txt"
+
+test_done
+
diff --git a/xdiff/xdiff.h b/xdiff/xdiff.h
index c9f8178..fa409d5 100644
--- a/xdiff/xdiff.h
+++ b/xdiff/xdiff.h
@@ -49,6 +49,9 @@ extern "C" {
#define XDL_BDOP_CPY 2
#define XDL_BDOP_INSB 3
+#define XDL_MERGE_MINIMAL 0
+#define XDL_MERGE_EAGER 1
+#define XDL_MERGE_ZEALOUS 2
typedef struct s_mmfile {
char *ptr;
@@ -90,6 +93,10 @@ long xdl_mmfile_size(mmfile_t *mmf);
int xdl_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdemitconf_t const *xecfg, xdemitcb_t *ecb);
+int xdl_merge(mmfile_t *orig, mmfile_t *mf1, const char *name1,
+ mmfile_t *mf2, const char *name2,
+ xpparam_t const *xpp, int level, mmbuffer_t *result);
+
#ifdef __cplusplus
}
#endif /* #ifdef __cplusplus */
diff --git a/xdiff/xdiffi.c b/xdiff/xdiffi.c
index d76e76a..9aeebc4 100644
--- a/xdiff/xdiffi.c
+++ b/xdiff/xdiffi.c
@@ -45,7 +45,6 @@ static long xdl_split(unsigned long const *ha1, long off1, long lim1,
long *kvdf, long *kvdb, int need_min, xdpsplit_t *spl,
xdalgoenv_t *xenv);
static xdchange_t *xdl_add_change(xdchange_t *xscr, long i1, long i2, long chg1, long chg2);
-static int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags);
@@ -397,7 +396,7 @@ static xdchange_t *xdl_add_change(xdchange_t *xscr, long i1, long i2, long chg1,
}
-static int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
+int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags) {
long ix, ixo, ixs, ixref, grpsiz, nrec = xdf->nrec;
char *rchg = xdf->rchg, *rchgo = xdfo->rchg;
xrecord_t **recs = xdf->recs;
diff --git a/xdiff/xdiffi.h b/xdiff/xdiffi.h
index d3b7271..472aeae 100644
--- a/xdiff/xdiffi.h
+++ b/xdiff/xdiffi.h
@@ -50,6 +50,7 @@ int xdl_recs_cmp(diffdata_t *dd1, long off1, long lim1,
long *kvdf, long *kvdb, int need_min, xdalgoenv_t *xenv);
int xdl_do_diff(mmfile_t *mf1, mmfile_t *mf2, xpparam_t const *xpp,
xdfenv_t *xe);
+int xdl_change_compact(xdfile_t *xdf, xdfile_t *xdfo, long flags);
int xdl_build_script(xdfenv_t *xe, xdchange_t **xscr);
void xdl_free_script(xdchange_t *xscr);
int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
diff --git a/xdiff/xmerge.c b/xdiff/xmerge.c
new file mode 100644
index 0000000..352207e
--- /dev/null
+++ b/xdiff/xmerge.c
@@ -0,0 +1,419 @@
+/*
+ * LibXDiff by Davide Libenzi ( File Differential Library )
+ * Copyright (C) 2003-2006 Davide Libenzi, Johannes E. Schindelin
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Davide Libenzi <davidel@xmailserver.org>
+ *
+ */
+
+#include "xinclude.h"
+
+typedef struct s_xdmerge {
+ struct s_xdmerge *next;
+ /*
+ * 0 = conflict,
+ * 1 = no conflict, take first,
+ * 2 = no conflict, take second.
+ */
+ int mode;
+ long i1, i2;
+ long chg1, chg2;
+} xdmerge_t;
+
+static int xdl_append_merge(xdmerge_t **merge, int mode,
+ long i1, long chg1, long i2, long chg2)
+{
+ xdmerge_t *m = *merge;
+ if (m && (i1 <= m->i1 + m->chg1 || i2 <= m->i2 + m->chg2)) {
+ if (mode != m->mode)
+ m->mode = 0;
+ m->chg1 = i1 + chg1 - m->i1;
+ m->chg2 = i2 + chg2 - m->i2;
+ } else {
+ m = xdl_malloc(sizeof(xdmerge_t));
+ if (!m)
+ return -1;
+ m->next = NULL;
+ m->mode = mode;
+ m->i1 = i1;
+ m->chg1 = chg1;
+ m->i2 = i2;
+ m->chg2 = chg2;
+ if (*merge)
+ (*merge)->next = m;
+ *merge = m;
+ }
+ return 0;
+}
+
+static int xdl_cleanup_merge(xdmerge_t *c)
+{
+ int count = 0;
+ xdmerge_t *next_c;
+
+ /* were there conflicts? */
+ for (; c; c = next_c) {
+ if (c->mode == 0)
+ count++;
+ next_c = c->next;
+ free(c);
+ }
+ return count;
+}
+
+static int xdl_merge_cmp_lines(xdfenv_t *xe1, int i1, xdfenv_t *xe2, int i2,
+ int line_count, long flags)
+{
+ int i;
+ xrecord_t **rec1 = xe1->xdf2.recs + i1;
+ xrecord_t **rec2 = xe2->xdf2.recs + i2;
+
+ for (i = 0; i < line_count; i++) {
+ int result = xdl_recmatch(rec1[i]->ptr, rec1[i]->size,
+ rec2[i]->ptr, rec2[i]->size, flags);
+ if (!result)
+ return -1;
+ }
+ return 0;
+}
+
+static int xdl_recs_copy(xdfenv_t *xe, int i, int count, int add_nl, char *dest)
+{
+ xrecord_t **recs = xe->xdf2.recs + i;
+ int size = 0;
+
+ if (count < 1)
+ return 0;
+
+ for (i = 0; i < count; size += recs[i++]->size)
+ if (dest)
+ memcpy(dest + size, recs[i]->ptr, recs[i]->size);
+ if (add_nl) {
+ i = recs[count - 1]->size;
+ if (i == 0 || recs[count - 1]->ptr[i - 1] != '\n') {
+ if (dest)
+ dest[size] = '\n';
+ size++;
+ }
+ }
+ return size;
+}
+
+static int xdl_fill_merge_buffer(xdfenv_t *xe1, const char *name1,
+ xdfenv_t *xe2, const char *name2, xdmerge_t *m, char *dest)
+{
+ const int marker_size = 7;
+ int marker1_size = (name1 ? strlen(name1) + 1 : 0);
+ int marker2_size = (name2 ? strlen(name2) + 1 : 0);
+ int conflict_marker_size = 3 * (marker_size + 1)
+ + marker1_size + marker2_size;
+ int size, i1, j;
+
+ for (size = i1 = 0; m; m = m->next) {
+ if (m->mode == 0) {
+ size += xdl_recs_copy(xe1, i1, m->i1 - i1, 0,
+ dest ? dest + size : NULL);
+ if (dest) {
+ for (j = 0; j < marker_size; j++)
+ dest[size++] = '<';
+ if (marker1_size) {
+ dest[size] = ' ';
+ memcpy(dest + size + 1, name1,
+ marker1_size - 1);
+ size += marker1_size;
+ }
+ dest[size++] = '\n';
+ } else
+ size += conflict_marker_size;
+ size += xdl_recs_copy(xe1, m->i1, m->chg1, 1,
+ dest ? dest + size : NULL);
+ if (dest) {
+ for (j = 0; j < marker_size; j++)
+ dest[size++] = '=';
+ dest[size++] = '\n';
+ }
+ size += xdl_recs_copy(xe2, m->i2, m->chg2, 1,
+ dest ? dest + size : NULL);
+ if (dest) {
+ for (j = 0; j < marker_size; j++)
+ dest[size++] = '>';
+ if (marker2_size) {
+ dest[size] = ' ';
+ memcpy(dest + size + 1, name2,
+ marker2_size - 1);
+ size += marker2_size;
+ }
+ dest[size++] = '\n';
+ }
+ } else if (m->mode == 1)
+ size += xdl_recs_copy(xe1, i1, m->i1 + m->chg1 - i1, 0,
+ dest ? dest + size : NULL);
+ else if (m->mode == 2)
+ size += xdl_recs_copy(xe2, m->i2 - m->i1 + i1,
+ m->i1 + m->chg2 - i1, 0,
+ dest ? dest + size : NULL);
+ i1 = m->i1 + m->chg1;
+ }
+ size += xdl_recs_copy(xe1, i1, xe1->xdf2.nrec - i1, 0,
+ dest ? dest + size : NULL);
+ return size;
+}
+
+/*
+ * Sometimes, changes are not quite identical, but differ in only a few
+ * lines. Try hard to show only these few lines as conflicting.
+ */
+static int xdl_refine_conflicts(xdfenv_t *xe1, xdfenv_t *xe2, xdmerge_t *m,
+ xpparam_t const *xpp)
+{
+ for (; m; m = m->next) {
+ mmfile_t t1, t2;
+ xdfenv_t xe;
+ xdchange_t *xscr, *x;
+ int i1 = m->i1, i2 = m->i2;
+
+ /* let's handle just the conflicts */
+ if (m->mode)
+ continue;
+
+ /*
+ * This probably does not work outside git, since
+ * we have a very simple mmfile structure.
+ */
+ t1.ptr = (char *)xe1->xdf2.recs[m->i1]->ptr;
+ t1.size = xe1->xdf2.recs[m->i1 + m->chg1 - 1]->ptr
+ + xe1->xdf2.recs[m->i1 + m->chg1 - 1]->size - t1.ptr;
+ t2.ptr = (char *)xe2->xdf2.recs[m->i2]->ptr;
+ t2.size = xe2->xdf2.recs[m->i2 + m->chg2 - 1]->ptr
+ + xe2->xdf2.recs[m->i2 + m->chg2 - 1]->size - t2.ptr;
+ if (xdl_do_diff(&t1, &t2, xpp, &xe) < 0)
+ return -1;
+ if (xdl_change_compact(&xe.xdf1, &xe.xdf2, xpp->flags) < 0 ||
+ xdl_change_compact(&xe.xdf2, &xe.xdf1, xpp->flags) < 0 ||
+ xdl_build_script(&xe, &xscr) < 0) {
+ xdl_free_env(&xe);
+ return -1;
+ }
+ if (!xscr) {
+ /* If this happens, it's a bug. */
+ xdl_free_env(&xe);
+ return -2;
+ }
+ x = xscr;
+ m->i1 = xscr->i1 + i1;
+ m->chg1 = xscr->chg1;
+ m->i2 = xscr->i2 + i2;
+ m->chg2 = xscr->chg2;
+ while (xscr->next) {
+ xdmerge_t *m2 = xdl_malloc(sizeof(xdmerge_t));
+ if (!m2) {
+ xdl_free_env(&xe);
+ xdl_free_script(x);
+ return -1;
+ }
+ xscr = xscr->next;
+ m2->next = m->next;
+ m->next = m2;
+ m = m2;
+ m->mode = 0;
+ m->i1 = xscr->i1 + i1;
+ m->chg1 = xscr->chg1;
+ m->i2 = xscr->i2 + i2;
+ m->chg2 = xscr->chg2;
+ }
+ xdl_free_env(&xe);
+ xdl_free_script(x);
+ }
+ return 0;
+}
+
+/*
+ * level == 0: mark all overlapping changes as conflict
+ * level == 1: mark overlapping changes as conflict only if not identical
+ * level == 2: analyze non-identical changes for minimal conflict set
+ *
+ * returns < 0 on error, == 0 for no conflicts, else number of conflicts
+ */
+static int xdl_do_merge(xdfenv_t *xe1, xdchange_t *xscr1, const char *name1,
+ xdfenv_t *xe2, xdchange_t *xscr2, const char *name2,
+ int level, xpparam_t const *xpp, mmbuffer_t *result) {
+ xdmerge_t *changes, *c;
+ int i1, i2, chg1, chg2;
+
+ c = changes = NULL;
+
+ while (xscr1 && xscr2) {
+ if (!changes)
+ changes = c;
+ if (xscr1->i1 + xscr1->chg1 < xscr2->i1) {
+ i1 = xscr1->i2;
+ i2 = xscr2->i2 - xscr2->i1 + xscr1->i1;
+ chg1 = xscr1->chg2;
+ chg2 = xscr1->chg1;
+ if (xdl_append_merge(&c, 1, i1, chg1, i2, chg2)) {
+ xdl_cleanup_merge(changes);
+ return -1;
+ }
+ xscr1 = xscr1->next;
+ continue;
+ }
+ if (xscr2->i1 + xscr2->chg1 < xscr1->i1) {
+ i1 = xscr1->i2 - xscr1->i1 + xscr2->i1;
+ i2 = xscr2->i2;
+ chg1 = xscr2->chg1;
+ chg2 = xscr2->chg2;
+ if (xdl_append_merge(&c, 2, i1, chg1, i2, chg2)) {
+ xdl_cleanup_merge(changes);
+ return -1;
+ }
+ xscr2 = xscr2->next;
+ continue;
+ }
+ if (level < 1 || xscr1->i1 != xscr2->i1 ||
+ xscr1->chg1 != xscr2->chg1 ||
+ xscr1->chg2 != xscr2->chg2 ||
+ xdl_merge_cmp_lines(xe1, xscr1->i2,
+ xe2, xscr2->i2,
+ xscr1->chg2, xpp->flags)) {
+ /* conflict */
+ int off = xscr1->i1 - xscr2->i1;
+ int ffo = off + xscr1->chg1 - xscr2->chg1;
+
+ i1 = xscr1->i2;
+ i2 = xscr2->i2;
+ if (off > 0)
+ i1 -= off;
+ else
+ i2 += off;
+ chg1 = xscr1->i2 + xscr1->chg2 - i1;
+ chg2 = xscr2->i2 + xscr2->chg2 - i2;
+ if (ffo > 0)
+ chg2 += ffo;
+ else
+ chg1 -= ffo;
+ if (xdl_append_merge(&c, 0, i1, chg1, i2, chg2)) {
+ xdl_cleanup_merge(changes);
+ return -1;
+ }
+ }
+
+ i1 = xscr1->i1 + xscr1->chg1;
+ i2 = xscr2->i1 + xscr2->chg1;
+
+ if (i1 >= i2)
+ xscr2 = xscr2->next;
+ if (i2 >= i1)
+ xscr1 = xscr1->next;
+ }
+ while (xscr1) {
+ if (!changes)
+ changes = c;
+ i1 = xscr1->i2;
+ i2 = xscr1->i1 + xe2->xdf2.nrec - xe2->xdf1.nrec;
+ chg1 = xscr1->chg2;
+ chg2 = xscr1->chg1;
+ if (xdl_append_merge(&c, 1, i1, chg1, i2, chg2)) {
+ xdl_cleanup_merge(changes);
+ return -1;
+ }
+ xscr1 = xscr1->next;
+ }
+ while (xscr2) {
+ if (!changes)
+ changes = c;
+ i1 = xscr2->i1 + xe1->xdf2.nrec - xe1->xdf1.nrec;
+ i2 = xscr2->i2;
+ chg1 = xscr2->chg1;
+ chg2 = xscr2->chg2;
+ if (xdl_append_merge(&c, 2, i1, chg1, i2, chg2)) {
+ xdl_cleanup_merge(changes);
+ return -1;
+ }
+ xscr2 = xscr2->next;
+ }
+ if (!changes)
+ changes = c;
+ /* refine conflicts */
+ if (level > 1 && xdl_refine_conflicts(xe1, xe2, changes, xpp) < 0) {
+ xdl_cleanup_merge(changes);
+ return -1;
+ }
+ /* output */
+ if (result) {
+ int size = xdl_fill_merge_buffer(xe1, name1, xe2, name2,
+ changes, NULL);
+ result->ptr = xdl_malloc(size);
+ if (!result->ptr) {
+ xdl_cleanup_merge(changes);
+ return -1;
+ }
+ result->size = size;
+ xdl_fill_merge_buffer(xe1, name1, xe2, name2, changes,
+ result->ptr);
+ }
+ return xdl_cleanup_merge(changes);
+}
+
+int xdl_merge(mmfile_t *orig, mmfile_t *mf1, const char *name1,
+ mmfile_t *mf2, const char *name2,
+ xpparam_t const *xpp, int level, mmbuffer_t *result) {
+ xdchange_t *xscr1, *xscr2;
+ xdfenv_t xe1, xe2;
+ int status;
+
+ result->ptr = NULL;
+ result->size = 0;
+
+ if (xdl_do_diff(orig, mf1, xpp, &xe1) < 0 ||
+ xdl_do_diff(orig, mf2, xpp, &xe2) < 0) {
+ return -1;
+ }
+ if (xdl_change_compact(&xe1.xdf1, &xe1.xdf2, xpp->flags) < 0 ||
+ xdl_change_compact(&xe1.xdf2, &xe1.xdf1, xpp->flags) < 0 ||
+ xdl_build_script(&xe1, &xscr1) < 0) {
+ xdl_free_env(&xe1);
+ return -1;
+ }
+ if (xdl_change_compact(&xe2.xdf1, &xe2.xdf2, xpp->flags) < 0 ||
+ xdl_change_compact(&xe2.xdf2, &xe2.xdf1, xpp->flags) < 0 ||
+ xdl_build_script(&xe2, &xscr2) < 0) {
+ xdl_free_env(&xe2);
+ return -1;
+ }
+ status = 0;
+ if (xscr1 || xscr2) {
+ if (!xscr1) {
+ result->ptr = xdl_malloc(mf2->size);
+ memcpy(result->ptr, mf2->ptr, mf2->size);
+ result->size = mf2->size;
+ } else if (!xscr2) {
+ result->ptr = xdl_malloc(mf1->size);
+ memcpy(result->ptr, mf1->ptr, mf1->size);
+ result->size = mf1->size;
+ } else {
+ status = xdl_do_merge(&xe1, xscr1, name1,
+ &xe2, xscr2, name2,
+ level, xpp, result);
+ }
+ xdl_free_script(xscr1);
+ xdl_free_script(xscr2);
+ }
+ xdl_free_env(&xe1);
+ xdl_free_env(&xe2);
+
+ return status;
+}