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#include <stdio.h>

#include <git2.h>

#include <stdlib.h>

#include <string.h>

static void check(int error, const char *message)

{

if (error) {

fprintf(stderr, "%s (%d)\n", message, error);

exit(1);

}

}

static int resolve_to_tree(

git_repository *repo, const char *identifier, git_tree **tree)

{

int err = 0;

git_object *obj = NULL;

if ((err = git_revparse_single(&obj, repo, identifier)) < 0)

return err;

switch (git_object_type(obj)) {

case GIT_OBJ_TREE:

*tree = (git_tree *)obj;

break;

case GIT_OBJ_COMMIT:

err = git_commit_tree(tree, (git_commit *)obj);

git_object_free(obj);

break;

default:

err = GIT_ENOTFOUND;

}

return err;

}

char *colors[] = {

"\033[m", /* reset */

"\033[1m", /* bold */

"\033[31m", /* red */

"\033[32m", /* green */

"\033[36m" /* cyan */

};

static int printer(

const git_diff_delta *delta,

const git_diff_range *range,

char usage,

const char *line,

size_t line_len,

void *data)

{

int *last_color = data, color = 0;

(void)delta; (void)range; (void)line_len;

if (*last_color >= 0) {

switch (usage) {

case GIT_DIFF_LINE_ADDITION: color = 3; break;

case GIT_DIFF_LINE_DELETION: color = 2; break;

case GIT_DIFF_LINE_ADD_EOFNL: color = 3; break;

case GIT_DIFF_LINE_DEL_EOFNL: color = 2; break;

case GIT_DIFF_LINE_FILE_HDR: color = 1; break;

case GIT_DIFF_LINE_HUNK_HDR: color = 4; break;

default: color = 0;

}

if (color != *last_color) {

if (*last_color == 1 || color == 1)

fputs(colors[0], stdout);

fputs(colors[color], stdout);

*last_color = color;

}

}

fputs(line, stdout);

return 0;

}

static int check_uint16_param(const char *arg, const char *pattern, uint16_t *val)

{

size_t len = strlen(pattern);

uint16_t strval;

char *endptr = NULL;

if (strncmp(arg, pattern, len))

return 0;

if (arg[len] == '\0' && pattern[len - 1] != '=')

return 1;

if (arg[len] == '=')

len++;

strval = strtoul(arg + len, &endptr, 0);

if (endptr == arg)

return 0;

*val = strval;

return 1;

}

static int check_str_param(const char *arg, const char *pattern, const char **val)

{

size_t len = strlen(pattern);

if (strncmp(arg, pattern, len))

return 0;

*val = (const char *)(arg + len);

return 1;

}

static void usage(const char *message, const char *arg)

{

if (message && arg)

fprintf(stderr, "%s: %s\n", message, arg);

else if (message)

fprintf(stderr, "%s\n", message);

fprintf(stderr, "usage: diff [<tree-oid> [<tree-oid>]]\n");

exit(1);

}

enum {

FORMAT_PATCH = 0,

FORMAT_COMPACT = 1,

FORMAT_RAW = 2

};

int main(int argc, char *argv[])

{

git_repository *repo = NULL;

git_tree *t1 = NULL, *t2 = NULL;

git_diff_options opts = GIT_DIFF_OPTIONS_INIT;

git_diff_find_options findopts = GIT_DIFF_FIND_OPTIONS_INIT;

git_diff_list *diff;

int i, color = -1, format = FORMAT_PATCH, cached = 0;

char *a, *treeish1 = NULL, *treeish2 = NULL;

const char *dir = ".";

git_threads_init();

/* parse arguments as copied from git-diff */

for (i = 1; i < argc; ++i) {

a = argv[i];

if (a[0] != '-') {

if (treeish1 == NULL)

treeish1 = a;

else if (treeish2 == NULL)

treeish2 = a;

else

usage("Only one or two tree identifiers can be provided", NULL);

}

else if (!strcmp(a, "-p") || !strcmp(a, "-u") ||

!strcmp(a, "--patch"))

format = FORMAT_PATCH;

else if (!strcmp(a, "--cached"))

cached = 1;

else if (!strcmp(a, "--name-status"))

format = FORMAT_COMPACT;

else if (!strcmp(a, "--raw"))

format = FORMAT_RAW;

else if (!strcmp(a, "--color"))

color = 0;

else if (!strcmp(a, "--no-color"))

color = -1;

else if (!strcmp(a, "-R"))

opts.flags |= GIT_DIFF_REVERSE;

else if (!strcmp(a, "-a") || !strcmp(a, "--text"))

opts.flags |= GIT_DIFF_FORCE_TEXT;

else if (!strcmp(a, "--ignore-space-at-eol"))

opts.flags |= GIT_DIFF_IGNORE_WHITESPACE_EOL;

else if (!strcmp(a, "-b") || !strcmp(a, "--ignore-space-change"))

opts.flags |= GIT_DIFF_IGNORE_WHITESPACE_CHANGE;

else if (!strcmp(a, "-w") || !strcmp(a, "--ignore-all-space"))

opts.flags |= GIT_DIFF_IGNORE_WHITESPACE;

else if (!strcmp(a, "--ignored"))

opts.flags |= GIT_DIFF_INCLUDE_IGNORED;

else if (!strcmp(a, "--untracked"))

opts.flags |= GIT_DIFF_INCLUDE_UNTRACKED;

else if (check_uint16_param(a, "-M", &findopts.rename_threshold) ||

check_uint16_param(a, "--find-renames",

&findopts.rename_threshold))

findopts.flags |= GIT_DIFF_FIND_RENAMES;

else if (check_uint16_param(a, "-C", &findopts.copy_threshold) ||

check_uint16_param(a, "--find-copies",

&findopts.copy_threshold))

findopts.flags |= GIT_DIFF_FIND_COPIES;

else if (!strcmp(a, "--find-copies-harder"))

findopts.flags |= GIT_DIFF_FIND_COPIES_FROM_UNMODIFIED;

else if (!strncmp(a, "-B", 2) || !strncmp(a, "--break-rewrites", 16)) {

/* TODO: parse thresholds */

findopts.flags |= GIT_DIFF_FIND_REWRITES;

}

else if (!check_uint16_param(a, "-U", &opts.context_lines) &&

!check_uint16_param(a, "--unified=", &opts.context_lines) &&

!check_uint16_param(a, "--inter-hunk-context=",

&opts.interhunk_lines) &&

!check_str_param(a, "--src-prefix=", &opts.old_prefix) &&

!check_str_param(a, "--dst-prefix=", &opts.new_prefix) &&

!check_str_param(a, "--git-dir=", &dir))

usage("Unknown arg", a);

}

/* open repo */

check(git_repository_open_ext(&repo, dir, 0, NULL),

"Could not open repository");

if (treeish1)

check(resolve_to_tree(repo, treeish1, &t1), "Looking up first tree");

if (treeish2)

check(resolve_to_tree(repo, treeish2, &t2), "Looking up second tree");

/* <sha1> <sha2> */

/* <sha1> --cached */

/* <sha1> */

/* --cached */

/* nothing */

if (t1 && t2)

check(git_diff_tree_to_tree(&diff, repo, t1, t2, &opts), "Diff");

else if (t1 && cached)

check(git_diff_tree_to_index(&diff, repo, t1, NULL, &opts), "Diff");

else if (t1) {

git_diff_list *diff2;

check(git_diff_tree_to_index(&diff, repo, t1, NULL, &opts), "Diff");

check(git_diff_index_to_workdir(&diff2, repo, NULL, &opts), "Diff");

check(git_diff_merge(diff, diff2), "Merge diffs");

git_diff_list_free(diff2);

}

else if (cached) {

check(resolve_to_tree(repo, "HEAD", &t1), "looking up HEAD");

check(git_diff_tree_to_index(&diff, repo, t1, NULL, &opts), "Diff");

}

else

check(git_diff_index_to_workdir(&diff, repo, NULL, &opts), "Diff");

if ((findopts.flags & GIT_DIFF_FIND_ALL) != 0)

check(git_diff_find_similar(diff, &findopts),

"finding renames and copies ");

if (color >= 0)

fputs(colors[0], stdout);

switch (format) {

case FORMAT_PATCH:

check(git_diff_print_patch(diff, printer, &color), "Displaying diff");

break;

case FORMAT_COMPACT:

check(git_diff_print_compact(diff, printer, &color), "Displaying diff");

break;

case FORMAT_RAW:

check(git_diff_print_raw(diff, printer, &color), "Displaying diff");

break;

}

if (color >= 0)

fputs(colors[0], stdout);

git_diff_list_free(diff);

git_tree_free(t1);

git_tree_free(t2);

git_repository_free(repo);

git_threads_shutdown();

return 0;

}