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Compare buffers in diff example

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This commit is contained in:
Alberto Fanjul
2019-06-18 08:31:31 +02:00
parent 398412ccd3
commit 3be09b6c02
3 changed files with 130 additions and 36 deletions
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114
examples/diff.c
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@@ -52,6 +52,7 @@ struct opts {
git_diff_options diffopts;
git_diff_find_options findopts;
int color;
int no_index;
int cache;
int output;
git_diff_format_t format;
@@ -66,14 +67,16 @@ static void parse_opts(struct opts *o, int argc, char *argv[]);
static int color_printer(
const git_diff_delta*, const git_diff_hunk*, const git_diff_line*, void*);
static void diff_print_stats(git_diff *diff, struct opts *o);
static void compute_diff_no_index(git_diff **diff, struct opts *o);
int lg2_diff(git_repository *repo, int argc, char *argv[])
{
git_tree *t1 = NULL, *t2 = NULL;
git_diff *diff;
struct opts o = {
GIT_DIFF_OPTIONS_INIT, GIT_DIFF_FIND_OPTIONS_INIT,
-1, 0, 0, GIT_DIFF_FORMAT_PATCH, NULL, NULL, "."
-1, -1, 0, 0, GIT_DIFF_FORMAT_PATCH, NULL, NULL, "."
};
parse_opts(&o, argc, argv);
@@ -86,49 +89,54 @@ int lg2_diff(git_repository *repo, int argc, char *argv[])
* * <sha1>
* * --cached
* * --nocache (don't use index data in diff at all)
* * --no-index <file1> <file2>
* * nothing
*
* Currently ranged arguments like <sha1>..<sha2> and <sha1>...<sha2>
* are not supported in this example
*/
if (o.treeish1)
treeish_to_tree(&t1, repo, o.treeish1);
if (o.treeish2)
treeish_to_tree(&t2, repo, o.treeish2);
if (o.no_index >= 0) {
compute_diff_no_index(&diff, &o);
} else {
if (o.treeish1)
treeish_to_tree(&t1, repo, o.treeish1);
if (o.treeish2)
treeish_to_tree(&t2, repo, o.treeish2);
if (t1 && t2)
check_lg2(
git_diff_tree_to_tree(&diff, repo, t1, t2, &o.diffopts),
"diff trees", NULL);
else if (o.cache != CACHE_NORMAL) {
if (!t1)
treeish_to_tree(&t1, repo, "HEAD");
if (o.cache == CACHE_NONE)
if (t1 && t2)
check_lg2(
git_diff_tree_to_workdir(&diff, repo, t1, &o.diffopts),
git_diff_tree_to_tree(&diff, repo, t1, t2, &o.diffopts),
"diff trees", NULL);
else if (o.cache != CACHE_NORMAL) {
if (!t1)
treeish_to_tree(&t1, repo, "HEAD");
if (o.cache == CACHE_NONE)
check_lg2(
git_diff_tree_to_workdir(&diff, repo, t1, &o.diffopts),
"diff tree to working directory", NULL);
else
check_lg2(
git_diff_tree_to_index(&diff, repo, t1, NULL, &o.diffopts),
"diff tree to index", NULL);
}
else if (t1)
check_lg2(
git_diff_tree_to_workdir_with_index(&diff, repo, t1, &o.diffopts),
"diff tree to working directory", NULL);
else
check_lg2(
git_diff_tree_to_index(&diff, repo, t1, NULL, &o.diffopts),
"diff tree to index", NULL);
git_diff_index_to_workdir(&diff, repo, NULL, &o.diffopts),
"diff index to working directory", NULL);
/** Apply rename and copy detection if requested. */
if ((o.findopts.flags & GIT_DIFF_FIND_ALL) != 0)
check_lg2(
git_diff_find_similar(diff, &o.findopts),
"finding renames and copies", NULL);
}
else if (t1)
check_lg2(
git_diff_tree_to_workdir_with_index(&diff, repo, t1, &o.diffopts),
"diff tree to working directory", NULL);
else
check_lg2(
git_diff_index_to_workdir(&diff, repo, NULL, &o.diffopts),
"diff index to working directory", NULL);
/** Apply rename and copy detection if requested. */
if ((o.findopts.flags & GIT_DIFF_FIND_ALL) != 0)
check_lg2(
git_diff_find_similar(diff, &o.findopts),
"finding renames and copies", NULL);
/** Generate simple output using libgit2 display helper. */
@@ -158,6 +166,38 @@ int lg2_diff(git_repository *repo, int argc, char *argv[])
return 0;
}
static void compute_diff_no_index(git_diff **diff, struct opts *o) {
git_patch *patch = NULL;
char *file1_str = NULL;
char *file2_str = NULL;
git_buf buf = {0};
if (!o->treeish1 || !o->treeish2) {
usage("two files should be provided as arguments", NULL);
}
file1_str = read_file(o->treeish1);
if (file1_str == NULL) {
usage("file cannot be read", o->treeish1);
}
file2_str = read_file(o->treeish2);
if (file2_str == NULL) {
usage("file cannot be read", o->treeish2);
}
check_lg2(
git_patch_from_buffers(&patch, file1_str, strlen(file1_str), o->treeish1, file2_str, strlen(file2_str), o->treeish2, &o->diffopts),
"patch buffers", NULL);
check_lg2(
git_patch_to_buf(&buf, patch),
"patch to buf", NULL);
check_lg2(
git_diff_from_buffer(diff, buf.ptr, buf.size),
"diff from patch", NULL);
git_patch_free(patch);
git_buf_dispose(&buf);
free(file1_str);
free(file2_str);
}
static void usage(const char *message, const char *arg)
{
if (message && arg)
@@ -223,9 +263,10 @@ static void parse_opts(struct opts *o, int argc, char *argv[])
o->output |= OUTPUT_DIFF;
o->format = GIT_DIFF_FORMAT_PATCH;
}
else if (!strcmp(a, "--cached"))
else if (!strcmp(a, "--cached")) {
o->cache = CACHE_ONLY;
else if (!strcmp(a, "--nocache"))
if (o->no_index >= 0) usage("--cached and --no-index are incompatible", NULL);
} else if (!strcmp(a, "--nocache"))
o->cache = CACHE_NONE;
else if (!strcmp(a, "--name-only") || !strcmp(a, "--format=name"))
o->format = GIT_DIFF_FORMAT_NAME_ONLY;
@@ -238,7 +279,10 @@ static void parse_opts(struct opts *o, int argc, char *argv[])
o->format = GIT_DIFF_FORMAT_RAW;
o->diffopts.id_abbrev = 40;
}
else if (!strcmp(a, "--color"))
else if (!strcmp(a, "--no-index")) {
o->no_index = 0;
if (o->cache == CACHE_ONLY) usage("--cached and --no-index are incompatible", NULL);
} else if (!strcmp(a, "--color"))
o->color = 0;
else if (!strcmp(a, "--no-color"))
o->color = -1;