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![Junio C Hamano](/assets/img/avatar_default.png)
The textual diff generation with built-in '-p' in diff-* brothers has proven to be useful enough that git-diff-helper outlived its usefulness. Signed-off-by: Junio C Hamano <junkio@cox.net>
1186 lines
29 KiB
C
1186 lines
29 KiB
C
/*
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* Copyright (C) 2005 Junio C Hamano
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*/
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <signal.h>
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#include "cache.h"
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#include "quote.h"
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#include "diff.h"
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#include "diffcore.h"
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static const char *diff_opts = "-pu";
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static unsigned char null_sha1[20] = { 0, };
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static int reverse_diff;
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static int use_size_cache;
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static const char *external_diff(void)
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{
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static const char *external_diff_cmd = NULL;
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static int done_preparing = 0;
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const char *env_diff_opts;
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if (done_preparing)
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return external_diff_cmd;
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/*
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* Default values above are meant to match the
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* Linux kernel development style. Examples of
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* alternative styles you can specify via environment
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* variables are:
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*
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* GIT_DIFF_OPTS="-c";
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*/
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external_diff_cmd = getenv("GIT_EXTERNAL_DIFF");
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/* In case external diff fails... */
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env_diff_opts = getenv("GIT_DIFF_OPTS");
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if (env_diff_opts) diff_opts = env_diff_opts;
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done_preparing = 1;
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return external_diff_cmd;
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}
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#define TEMPFILE_PATH_LEN 50
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static struct diff_tempfile {
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const char *name; /* filename external diff should read from */
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char hex[41];
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char mode[10];
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char tmp_path[TEMPFILE_PATH_LEN];
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} diff_temp[2];
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static int count_lines(const char *filename)
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{
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FILE *in;
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int count, ch, completely_empty = 1, nl_just_seen = 0;
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in = fopen(filename, "r");
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count = 0;
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while ((ch = fgetc(in)) != EOF)
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if (ch == '\n') {
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count++;
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nl_just_seen = 1;
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completely_empty = 0;
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}
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else {
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nl_just_seen = 0;
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completely_empty = 0;
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}
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fclose(in);
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if (completely_empty)
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return 0;
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if (!nl_just_seen)
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count++; /* no trailing newline */
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return count;
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}
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static void print_line_count(int count)
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{
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switch (count) {
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case 0:
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printf("0,0");
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break;
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case 1:
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printf("1");
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break;
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default:
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printf("1,%d", count);
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break;
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}
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}
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static void copy_file(int prefix, const char *filename)
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{
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FILE *in;
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int ch, nl_just_seen = 1;
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in = fopen(filename, "r");
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while ((ch = fgetc(in)) != EOF) {
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if (nl_just_seen)
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putchar(prefix);
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putchar(ch);
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if (ch == '\n')
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nl_just_seen = 1;
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else
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nl_just_seen = 0;
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}
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fclose(in);
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if (!nl_just_seen)
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printf("\n\\ No newline at end of file\n");
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}
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static void emit_rewrite_diff(const char *name_a,
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const char *name_b,
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struct diff_tempfile *temp)
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{
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/* Use temp[i].name as input, name_a and name_b as labels */
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int lc_a, lc_b;
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lc_a = count_lines(temp[0].name);
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lc_b = count_lines(temp[1].name);
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printf("--- %s\n+++ %s\n@@ -", name_a, name_b);
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print_line_count(lc_a);
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printf(" +");
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print_line_count(lc_b);
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printf(" @@\n");
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if (lc_a)
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copy_file('-', temp[0].name);
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if (lc_b)
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copy_file('+', temp[1].name);
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}
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static void builtin_diff(const char *name_a,
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const char *name_b,
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struct diff_tempfile *temp,
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const char *xfrm_msg,
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int complete_rewrite)
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{
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int i, next_at, cmd_size;
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const char *const diff_cmd = "diff -L%s%s -L%s%s";
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const char *const diff_arg = "%s %s||:"; /* "||:" is to return 0 */
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const char *input_name_sq[2];
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const char *path0[2];
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const char *path1[2];
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const char *name_sq[2];
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char *cmd;
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name_sq[0] = sq_quote(name_a);
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name_sq[1] = sq_quote(name_b);
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/* diff_cmd and diff_arg have 6 %s in total which makes
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* the sum of these strings 12 bytes larger than required.
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* we use 2 spaces around diff-opts, and we need to count
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* terminating NUL, so we subtract 9 here.
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*/
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cmd_size = (strlen(diff_cmd) + strlen(diff_opts) +
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strlen(diff_arg) - 9);
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for (i = 0; i < 2; i++) {
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input_name_sq[i] = sq_quote(temp[i].name);
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if (!strcmp(temp[i].name, "/dev/null")) {
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path0[i] = "/dev/null";
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path1[i] = "";
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} else {
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path0[i] = i ? "b/" : "a/";
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path1[i] = name_sq[i];
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}
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cmd_size += (strlen(path0[i]) + strlen(path1[i]) +
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strlen(input_name_sq[i]));
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}
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cmd = xmalloc(cmd_size);
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next_at = 0;
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next_at += snprintf(cmd+next_at, cmd_size-next_at,
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diff_cmd,
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path0[0], path1[0], path0[1], path1[1]);
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next_at += snprintf(cmd+next_at, cmd_size-next_at,
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" %s ", diff_opts);
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next_at += snprintf(cmd+next_at, cmd_size-next_at,
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diff_arg, input_name_sq[0], input_name_sq[1]);
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printf("diff --git a/%s b/%s\n", name_a, name_b);
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if (!path1[0][0]) {
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printf("new file mode %s\n", temp[1].mode);
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if (xfrm_msg && xfrm_msg[0])
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puts(xfrm_msg);
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}
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else if (!path1[1][0]) {
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printf("deleted file mode %s\n", temp[0].mode);
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if (xfrm_msg && xfrm_msg[0])
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puts(xfrm_msg);
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}
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else {
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if (strcmp(temp[0].mode, temp[1].mode)) {
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printf("old mode %s\n", temp[0].mode);
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printf("new mode %s\n", temp[1].mode);
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}
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if (xfrm_msg && xfrm_msg[0])
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puts(xfrm_msg);
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if (strncmp(temp[0].mode, temp[1].mode, 3))
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/* we do not run diff between different kind
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* of objects.
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*/
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exit(0);
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if (complete_rewrite) {
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fflush(NULL);
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emit_rewrite_diff(name_a, name_b, temp);
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exit(0);
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}
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}
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fflush(NULL);
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execlp("/bin/sh","sh", "-c", cmd, NULL);
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}
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struct diff_filespec *alloc_filespec(const char *path)
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{
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int namelen = strlen(path);
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struct diff_filespec *spec = xmalloc(sizeof(*spec) + namelen + 1);
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memset(spec, 0, sizeof(*spec));
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spec->path = (char *)(spec + 1);
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memcpy(spec->path, path, namelen+1);
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return spec;
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}
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void fill_filespec(struct diff_filespec *spec, const unsigned char *sha1,
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unsigned short mode)
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{
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if (mode) {
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spec->mode = DIFF_FILE_CANON_MODE(mode);
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memcpy(spec->sha1, sha1, 20);
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spec->sha1_valid = !!memcmp(sha1, null_sha1, 20);
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}
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}
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/*
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* Given a name and sha1 pair, if the dircache tells us the file in
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* the work tree has that object contents, return true, so that
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* prepare_temp_file() does not have to inflate and extract.
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*/
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static int work_tree_matches(const char *name, const unsigned char *sha1)
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{
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struct cache_entry *ce;
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struct stat st;
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int pos, len;
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/* We do not read the cache ourselves here, because the
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* benchmark with my previous version that always reads cache
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* shows that it makes things worse for diff-tree comparing
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* two linux-2.6 kernel trees in an already checked out work
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* tree. This is because most diff-tree comparisons deal with
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* only a small number of files, while reading the cache is
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* expensive for a large project, and its cost outweighs the
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* savings we get by not inflating the object to a temporary
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* file. Practically, this code only helps when we are used
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* by diff-cache --cached, which does read the cache before
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* calling us.
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*/
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if (!active_cache)
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return 0;
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len = strlen(name);
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pos = cache_name_pos(name, len);
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if (pos < 0)
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return 0;
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ce = active_cache[pos];
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if ((lstat(name, &st) < 0) ||
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!S_ISREG(st.st_mode) || /* careful! */
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ce_match_stat(ce, &st) ||
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memcmp(sha1, ce->sha1, 20))
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return 0;
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/* we return 1 only when we can stat, it is a regular file,
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* stat information matches, and sha1 recorded in the cache
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* matches. I.e. we know the file in the work tree really is
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* the same as the <name, sha1> pair.
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*/
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return 1;
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}
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static struct sha1_size_cache {
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unsigned char sha1[20];
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unsigned long size;
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} **sha1_size_cache;
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static int sha1_size_cache_nr, sha1_size_cache_alloc;
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static struct sha1_size_cache *locate_size_cache(unsigned char *sha1,
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int find_only,
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unsigned long size)
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{
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int first, last;
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struct sha1_size_cache *e;
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first = 0;
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last = sha1_size_cache_nr;
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while (last > first) {
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int cmp, next = (last + first) >> 1;
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e = sha1_size_cache[next];
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cmp = memcmp(e->sha1, sha1, 20);
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if (!cmp)
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return e;
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if (cmp < 0) {
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last = next;
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continue;
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}
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first = next+1;
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}
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/* not found */
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if (find_only)
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return NULL;
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/* insert to make it at "first" */
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if (sha1_size_cache_alloc <= sha1_size_cache_nr) {
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sha1_size_cache_alloc = alloc_nr(sha1_size_cache_alloc);
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sha1_size_cache = xrealloc(sha1_size_cache,
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sha1_size_cache_alloc *
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sizeof(*sha1_size_cache));
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}
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sha1_size_cache_nr++;
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if (first < sha1_size_cache_nr)
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memmove(sha1_size_cache + first + 1, sha1_size_cache + first,
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(sha1_size_cache_nr - first - 1) *
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sizeof(*sha1_size_cache));
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e = xmalloc(sizeof(struct sha1_size_cache));
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sha1_size_cache[first] = e;
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memcpy(e->sha1, sha1, 20);
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e->size = size;
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return e;
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}
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/*
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* While doing rename detection and pickaxe operation, we may need to
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* grab the data for the blob (or file) for our own in-core comparison.
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* diff_filespec has data and size fields for this purpose.
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*/
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int diff_populate_filespec(struct diff_filespec *s, int size_only)
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{
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int err = 0;
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if (!DIFF_FILE_VALID(s))
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die("internal error: asking to populate invalid file.");
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if (S_ISDIR(s->mode))
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return -1;
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if (!use_size_cache)
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size_only = 0;
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if (s->data)
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return err;
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if (!s->sha1_valid ||
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work_tree_matches(s->path, s->sha1)) {
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struct stat st;
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int fd;
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if (lstat(s->path, &st) < 0) {
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if (errno == ENOENT) {
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err_empty:
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err = -1;
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empty:
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s->data = "";
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s->size = 0;
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return err;
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}
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}
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s->size = st.st_size;
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if (!s->size)
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goto empty;
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if (size_only)
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return 0;
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if (S_ISLNK(st.st_mode)) {
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int ret;
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s->data = xmalloc(s->size);
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s->should_free = 1;
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ret = readlink(s->path, s->data, s->size);
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if (ret < 0) {
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free(s->data);
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goto err_empty;
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}
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return 0;
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}
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fd = open(s->path, O_RDONLY);
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if (fd < 0)
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goto err_empty;
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s->data = mmap(NULL, s->size, PROT_READ, MAP_PRIVATE, fd, 0);
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close(fd);
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if (s->data == MAP_FAILED)
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goto err_empty;
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s->should_munmap = 1;
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}
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else {
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char type[20];
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struct sha1_size_cache *e;
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if (size_only) {
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e = locate_size_cache(s->sha1, 1, 0);
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if (e) {
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s->size = e->size;
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return 0;
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}
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if (!sha1_object_info(s->sha1, type, &s->size))
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locate_size_cache(s->sha1, 0, s->size);
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}
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else {
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s->data = read_sha1_file(s->sha1, type, &s->size);
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s->should_free = 1;
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}
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}
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return 0;
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}
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void diff_free_filespec_data(struct diff_filespec *s)
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{
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if (s->should_free)
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free(s->data);
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else if (s->should_munmap)
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munmap(s->data, s->size);
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s->should_free = s->should_munmap = 0;
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s->data = NULL;
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}
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static void prep_temp_blob(struct diff_tempfile *temp,
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void *blob,
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unsigned long size,
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unsigned char *sha1,
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int mode)
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{
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int fd;
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fd = git_mkstemp(temp->tmp_path, TEMPFILE_PATH_LEN, ".diff_XXXXXX");
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if (fd < 0)
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die("unable to create temp-file");
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if (write(fd, blob, size) != size)
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die("unable to write temp-file");
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close(fd);
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temp->name = temp->tmp_path;
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strcpy(temp->hex, sha1_to_hex(sha1));
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temp->hex[40] = 0;
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sprintf(temp->mode, "%06o", mode);
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}
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static void prepare_temp_file(const char *name,
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struct diff_tempfile *temp,
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struct diff_filespec *one)
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{
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if (!DIFF_FILE_VALID(one)) {
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not_a_valid_file:
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/* A '-' entry produces this for file-2, and
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* a '+' entry produces this for file-1.
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*/
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temp->name = "/dev/null";
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strcpy(temp->hex, ".");
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strcpy(temp->mode, ".");
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return;
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}
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|
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if (!one->sha1_valid ||
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work_tree_matches(name, one->sha1)) {
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struct stat st;
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if (lstat(name, &st) < 0) {
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if (errno == ENOENT)
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goto not_a_valid_file;
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die("stat(%s): %s", name, strerror(errno));
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}
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if (S_ISLNK(st.st_mode)) {
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int ret;
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char *buf, buf_[1024];
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buf = ((sizeof(buf_) < st.st_size) ?
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xmalloc(st.st_size) : buf_);
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ret = readlink(name, buf, st.st_size);
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if (ret < 0)
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die("readlink(%s)", name);
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prep_temp_blob(temp, buf, st.st_size,
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(one->sha1_valid ?
|
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one->sha1 : null_sha1),
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(one->sha1_valid ?
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one->mode : S_IFLNK));
|
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}
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else {
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/* we can borrow from the file in the work tree */
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temp->name = name;
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if (!one->sha1_valid)
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strcpy(temp->hex, sha1_to_hex(null_sha1));
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else
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strcpy(temp->hex, sha1_to_hex(one->sha1));
|
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/* Even though we may sometimes borrow the
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* contents from the work tree, we always want
|
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* one->mode. mode is trustworthy even when
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* !(one->sha1_valid), as long as
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* DIFF_FILE_VALID(one).
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*/
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sprintf(temp->mode, "%06o", one->mode);
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}
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return;
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}
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else {
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if (diff_populate_filespec(one, 0))
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die("cannot read data blob for %s", one->path);
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prep_temp_blob(temp, one->data, one->size,
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one->sha1, one->mode);
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}
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}
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|
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static void remove_tempfile(void)
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{
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int i;
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|
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for (i = 0; i < 2; i++)
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if (diff_temp[i].name == diff_temp[i].tmp_path) {
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unlink(diff_temp[i].name);
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diff_temp[i].name = NULL;
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}
|
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}
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|
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static void remove_tempfile_on_signal(int signo)
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{
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remove_tempfile();
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}
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|
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/* An external diff command takes:
|
|
*
|
|
* diff-cmd name infile1 infile1-sha1 infile1-mode \
|
|
* infile2 infile2-sha1 infile2-mode [ rename-to ]
|
|
*
|
|
*/
|
|
static void run_external_diff(const char *pgm,
|
|
const char *name,
|
|
const char *other,
|
|
struct diff_filespec *one,
|
|
struct diff_filespec *two,
|
|
const char *xfrm_msg,
|
|
int complete_rewrite)
|
|
{
|
|
struct diff_tempfile *temp = diff_temp;
|
|
pid_t pid;
|
|
int status;
|
|
static int atexit_asked = 0;
|
|
const char *othername;
|
|
|
|
othername = (other? other : name);
|
|
if (one && two) {
|
|
prepare_temp_file(name, &temp[0], one);
|
|
prepare_temp_file(othername, &temp[1], two);
|
|
if (! atexit_asked &&
|
|
(temp[0].name == temp[0].tmp_path ||
|
|
temp[1].name == temp[1].tmp_path)) {
|
|
atexit_asked = 1;
|
|
atexit(remove_tempfile);
|
|
}
|
|
signal(SIGINT, remove_tempfile_on_signal);
|
|
}
|
|
|
|
fflush(NULL);
|
|
pid = fork();
|
|
if (pid < 0)
|
|
die("unable to fork");
|
|
if (!pid) {
|
|
if (pgm) {
|
|
if (one && two) {
|
|
const char *exec_arg[10];
|
|
const char **arg = &exec_arg[0];
|
|
*arg++ = pgm;
|
|
*arg++ = name;
|
|
*arg++ = temp[0].name;
|
|
*arg++ = temp[0].hex;
|
|
*arg++ = temp[0].mode;
|
|
*arg++ = temp[1].name;
|
|
*arg++ = temp[1].hex;
|
|
*arg++ = temp[1].mode;
|
|
if (other) {
|
|
*arg++ = other;
|
|
*arg++ = xfrm_msg;
|
|
}
|
|
*arg = NULL;
|
|
execvp(pgm, (char *const*) exec_arg);
|
|
}
|
|
else
|
|
execlp(pgm, pgm, name, NULL);
|
|
}
|
|
/*
|
|
* otherwise we use the built-in one.
|
|
*/
|
|
if (one && two)
|
|
builtin_diff(name, othername, temp, xfrm_msg,
|
|
complete_rewrite);
|
|
else
|
|
printf("* Unmerged path %s\n", name);
|
|
exit(0);
|
|
}
|
|
if (waitpid(pid, &status, 0) < 0 ||
|
|
!WIFEXITED(status) || WEXITSTATUS(status)) {
|
|
/* Earlier we did not check the exit status because
|
|
* diff exits non-zero if files are different, and
|
|
* we are not interested in knowing that. It was a
|
|
* mistake which made it harder to quit a diff-*
|
|
* session that uses the git-apply-patch-script as
|
|
* the GIT_EXTERNAL_DIFF. A custom GIT_EXTERNAL_DIFF
|
|
* should also exit non-zero only when it wants to
|
|
* abort the entire diff-* session.
|
|
*/
|
|
remove_tempfile();
|
|
fprintf(stderr, "external diff died, stopping at %s.\n", name);
|
|
exit(1);
|
|
}
|
|
remove_tempfile();
|
|
}
|
|
|
|
static void run_diff(struct diff_filepair *p)
|
|
{
|
|
const char *pgm = external_diff();
|
|
char msg_[PATH_MAX*2+200], *xfrm_msg;
|
|
struct diff_filespec *one;
|
|
struct diff_filespec *two;
|
|
const char *name;
|
|
const char *other;
|
|
int complete_rewrite = 0;
|
|
|
|
if (DIFF_PAIR_UNMERGED(p)) {
|
|
/* unmerged */
|
|
run_external_diff(pgm, p->one->path, NULL, NULL, NULL, NULL,
|
|
0);
|
|
return;
|
|
}
|
|
|
|
name = p->one->path;
|
|
other = (strcmp(name, p->two->path) ? p->two->path : NULL);
|
|
one = p->one; two = p->two;
|
|
switch (p->status) {
|
|
case DIFF_STATUS_COPIED:
|
|
sprintf(msg_,
|
|
"similarity index %d%%\n"
|
|
"copy from %s\n"
|
|
"copy to %s",
|
|
(int)(0.5 + p->score * 100.0/MAX_SCORE),
|
|
name, other);
|
|
xfrm_msg = msg_;
|
|
break;
|
|
case DIFF_STATUS_RENAMED:
|
|
sprintf(msg_,
|
|
"similarity index %d%%\n"
|
|
"rename from %s\n"
|
|
"rename to %s",
|
|
(int)(0.5 + p->score * 100.0/MAX_SCORE),
|
|
name, other);
|
|
xfrm_msg = msg_;
|
|
break;
|
|
case DIFF_STATUS_MODIFIED:
|
|
if (p->score) {
|
|
sprintf(msg_,
|
|
"dissimilarity index %d%%",
|
|
(int)(0.5 + p->score * 100.0/MAX_SCORE));
|
|
xfrm_msg = msg_;
|
|
complete_rewrite = 1;
|
|
break;
|
|
}
|
|
/* fallthru */
|
|
default:
|
|
xfrm_msg = NULL;
|
|
}
|
|
|
|
if (!pgm &&
|
|
DIFF_FILE_VALID(one) && DIFF_FILE_VALID(two) &&
|
|
(S_IFMT & one->mode) != (S_IFMT & two->mode)) {
|
|
/* a filepair that changes between file and symlink
|
|
* needs to be split into deletion and creation.
|
|
*/
|
|
struct diff_filespec *null = alloc_filespec(two->path);
|
|
run_external_diff(NULL, name, other, one, null, xfrm_msg, 0);
|
|
free(null);
|
|
null = alloc_filespec(one->path);
|
|
run_external_diff(NULL, name, other, null, two, xfrm_msg, 0);
|
|
free(null);
|
|
}
|
|
else
|
|
run_external_diff(pgm, name, other, one, two, xfrm_msg,
|
|
complete_rewrite);
|
|
}
|
|
|
|
void diff_setup(int flags)
|
|
{
|
|
if (flags & DIFF_SETUP_REVERSE)
|
|
reverse_diff = 1;
|
|
if (flags & DIFF_SETUP_USE_CACHE) {
|
|
if (!active_cache)
|
|
/* read-cache does not die even when it fails
|
|
* so it is safe for us to do this here. Also
|
|
* it does not smudge active_cache or active_nr
|
|
* when it fails, so we do not have to worry about
|
|
* cleaning it up oufselves either.
|
|
*/
|
|
read_cache();
|
|
}
|
|
if (flags & DIFF_SETUP_USE_SIZE_CACHE)
|
|
use_size_cache = 1;
|
|
|
|
}
|
|
|
|
static int parse_num(const char **cp_p)
|
|
{
|
|
int num, scale, ch, cnt;
|
|
const char *cp = *cp_p;
|
|
|
|
cnt = num = 0;
|
|
scale = 1;
|
|
while ('0' <= (ch = *cp) && ch <= '9') {
|
|
if (cnt++ < 5) {
|
|
/* We simply ignore more than 5 digits precision. */
|
|
scale *= 10;
|
|
num = num * 10 + ch - '0';
|
|
}
|
|
cp++;
|
|
}
|
|
*cp_p = cp;
|
|
|
|
/* user says num divided by scale and we say internally that
|
|
* is MAX_SCORE * num / scale.
|
|
*/
|
|
return (MAX_SCORE * num / scale);
|
|
}
|
|
|
|
int diff_scoreopt_parse(const char *opt)
|
|
{
|
|
int opt1, opt2, cmd;
|
|
|
|
if (*opt++ != '-')
|
|
return -1;
|
|
cmd = *opt++;
|
|
if (cmd != 'M' && cmd != 'C' && cmd != 'B')
|
|
return -1; /* that is not a -M, -C nor -B option */
|
|
|
|
opt1 = parse_num(&opt);
|
|
if (cmd != 'B')
|
|
opt2 = 0;
|
|
else {
|
|
if (*opt == 0)
|
|
opt2 = 0;
|
|
else if (*opt != '/')
|
|
return -1; /* we expect -B80/99 or -B80 */
|
|
else {
|
|
opt++;
|
|
opt2 = parse_num(&opt);
|
|
}
|
|
}
|
|
if (*opt != 0)
|
|
return -1;
|
|
return opt1 | (opt2 << 16);
|
|
}
|
|
|
|
struct diff_queue_struct diff_queued_diff;
|
|
|
|
void diff_q(struct diff_queue_struct *queue, struct diff_filepair *dp)
|
|
{
|
|
if (queue->alloc <= queue->nr) {
|
|
queue->alloc = alloc_nr(queue->alloc);
|
|
queue->queue = xrealloc(queue->queue,
|
|
sizeof(dp) * queue->alloc);
|
|
}
|
|
queue->queue[queue->nr++] = dp;
|
|
}
|
|
|
|
struct diff_filepair *diff_queue(struct diff_queue_struct *queue,
|
|
struct diff_filespec *one,
|
|
struct diff_filespec *two)
|
|
{
|
|
struct diff_filepair *dp = xmalloc(sizeof(*dp));
|
|
dp->one = one;
|
|
dp->two = two;
|
|
dp->score = 0;
|
|
dp->status = 0;
|
|
dp->source_stays = 0;
|
|
dp->broken_pair = 0;
|
|
if (queue)
|
|
diff_q(queue, dp);
|
|
return dp;
|
|
}
|
|
|
|
void diff_free_filepair(struct diff_filepair *p)
|
|
{
|
|
diff_free_filespec_data(p->one);
|
|
diff_free_filespec_data(p->two);
|
|
free(p->one);
|
|
free(p->two);
|
|
free(p);
|
|
}
|
|
|
|
static void diff_flush_raw(struct diff_filepair *p,
|
|
int line_termination,
|
|
int inter_name_termination)
|
|
{
|
|
int two_paths;
|
|
char status[10];
|
|
|
|
if (line_termination) {
|
|
const char *const err =
|
|
"path %s cannot be expressed without -z";
|
|
if (strchr(p->one->path, line_termination) ||
|
|
strchr(p->one->path, inter_name_termination))
|
|
die(err, p->one->path);
|
|
if (strchr(p->two->path, line_termination) ||
|
|
strchr(p->two->path, inter_name_termination))
|
|
die(err, p->two->path);
|
|
}
|
|
|
|
if (p->score)
|
|
sprintf(status, "%c%03d", p->status,
|
|
(int)(0.5 + p->score * 100.0/MAX_SCORE));
|
|
else {
|
|
status[0] = p->status;
|
|
status[1] = 0;
|
|
}
|
|
switch (p->status) {
|
|
case DIFF_STATUS_COPIED:
|
|
case DIFF_STATUS_RENAMED:
|
|
two_paths = 1;
|
|
break;
|
|
case DIFF_STATUS_ADDED:
|
|
case DIFF_STATUS_DELETED:
|
|
two_paths = 0;
|
|
break;
|
|
default:
|
|
two_paths = 0;
|
|
break;
|
|
}
|
|
printf(":%06o %06o %s ",
|
|
p->one->mode, p->two->mode, sha1_to_hex(p->one->sha1));
|
|
printf("%s %s%c%s",
|
|
sha1_to_hex(p->two->sha1),
|
|
status,
|
|
inter_name_termination,
|
|
p->one->path);
|
|
if (two_paths)
|
|
printf("%c%s", inter_name_termination, p->two->path);
|
|
putchar(line_termination);
|
|
}
|
|
|
|
static void diff_flush_name(struct diff_filepair *p,
|
|
int line_termination)
|
|
{
|
|
printf("%s%c", p->two->path, line_termination);
|
|
}
|
|
|
|
int diff_unmodified_pair(struct diff_filepair *p)
|
|
{
|
|
/* This function is written stricter than necessary to support
|
|
* the currently implemented transformers, but the idea is to
|
|
* let transformers to produce diff_filepairs any way they want,
|
|
* and filter and clean them up here before producing the output.
|
|
*/
|
|
struct diff_filespec *one, *two;
|
|
|
|
if (DIFF_PAIR_UNMERGED(p))
|
|
return 0; /* unmerged is interesting */
|
|
|
|
one = p->one;
|
|
two = p->two;
|
|
|
|
/* deletion, addition, mode or type change
|
|
* and rename are all interesting.
|
|
*/
|
|
if (DIFF_FILE_VALID(one) != DIFF_FILE_VALID(two) ||
|
|
DIFF_PAIR_MODE_CHANGED(p) ||
|
|
strcmp(one->path, two->path))
|
|
return 0;
|
|
|
|
/* both are valid and point at the same path. that is, we are
|
|
* dealing with a change.
|
|
*/
|
|
if (one->sha1_valid && two->sha1_valid &&
|
|
!memcmp(one->sha1, two->sha1, sizeof(one->sha1)))
|
|
return 1; /* no change */
|
|
if (!one->sha1_valid && !two->sha1_valid)
|
|
return 1; /* both look at the same file on the filesystem. */
|
|
return 0;
|
|
}
|
|
|
|
static void diff_flush_patch(struct diff_filepair *p)
|
|
{
|
|
if (diff_unmodified_pair(p))
|
|
return;
|
|
|
|
if ((DIFF_FILE_VALID(p->one) && S_ISDIR(p->one->mode)) ||
|
|
(DIFF_FILE_VALID(p->two) && S_ISDIR(p->two->mode)))
|
|
return; /* no tree diffs in patch format */
|
|
|
|
run_diff(p);
|
|
}
|
|
|
|
int diff_queue_is_empty(void)
|
|
{
|
|
struct diff_queue_struct *q = &diff_queued_diff;
|
|
int i;
|
|
for (i = 0; i < q->nr; i++)
|
|
if (!diff_unmodified_pair(q->queue[i]))
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
#if DIFF_DEBUG
|
|
void diff_debug_filespec(struct diff_filespec *s, int x, const char *one)
|
|
{
|
|
fprintf(stderr, "queue[%d] %s (%s) %s %06o %s\n",
|
|
x, one ? one : "",
|
|
s->path,
|
|
DIFF_FILE_VALID(s) ? "valid" : "invalid",
|
|
s->mode,
|
|
s->sha1_valid ? sha1_to_hex(s->sha1) : "");
|
|
fprintf(stderr, "queue[%d] %s size %lu flags %d\n",
|
|
x, one ? one : "",
|
|
s->size, s->xfrm_flags);
|
|
}
|
|
|
|
void diff_debug_filepair(const struct diff_filepair *p, int i)
|
|
{
|
|
diff_debug_filespec(p->one, i, "one");
|
|
diff_debug_filespec(p->two, i, "two");
|
|
fprintf(stderr, "score %d, status %c stays %d broken %d\n",
|
|
p->score, p->status ? p->status : '?',
|
|
p->source_stays, p->broken_pair);
|
|
}
|
|
|
|
void diff_debug_queue(const char *msg, struct diff_queue_struct *q)
|
|
{
|
|
int i;
|
|
if (msg)
|
|
fprintf(stderr, "%s\n", msg);
|
|
fprintf(stderr, "q->nr = %d\n", q->nr);
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
diff_debug_filepair(p, i);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
static void diff_resolve_rename_copy(void)
|
|
{
|
|
int i, j;
|
|
struct diff_filepair *p, *pp;
|
|
struct diff_queue_struct *q = &diff_queued_diff;
|
|
|
|
diff_debug_queue("resolve-rename-copy", q);
|
|
|
|
for (i = 0; i < q->nr; i++) {
|
|
p = q->queue[i];
|
|
p->status = 0; /* undecided */
|
|
if (DIFF_PAIR_UNMERGED(p))
|
|
p->status = DIFF_STATUS_UNMERGED;
|
|
else if (!DIFF_FILE_VALID(p->one))
|
|
p->status = DIFF_STATUS_ADDED;
|
|
else if (!DIFF_FILE_VALID(p->two))
|
|
p->status = DIFF_STATUS_DELETED;
|
|
else if (DIFF_PAIR_TYPE_CHANGED(p))
|
|
p->status = DIFF_STATUS_TYPE_CHANGED;
|
|
|
|
/* from this point on, we are dealing with a pair
|
|
* whose both sides are valid and of the same type, i.e.
|
|
* either in-place edit or rename/copy edit.
|
|
*/
|
|
else if (DIFF_PAIR_RENAME(p)) {
|
|
if (p->source_stays) {
|
|
p->status = DIFF_STATUS_COPIED;
|
|
continue;
|
|
}
|
|
/* See if there is some other filepair that
|
|
* copies from the same source as us. If so
|
|
* we are a copy. Otherwise we are either a
|
|
* copy if the path stays, or a rename if it
|
|
* does not, but we already handled "stays" case.
|
|
*/
|
|
for (j = i + 1; j < q->nr; j++) {
|
|
pp = q->queue[j];
|
|
if (strcmp(pp->one->path, p->one->path))
|
|
continue; /* not us */
|
|
if (!DIFF_PAIR_RENAME(pp))
|
|
continue; /* not a rename/copy */
|
|
/* pp is a rename/copy from the same source */
|
|
p->status = DIFF_STATUS_COPIED;
|
|
break;
|
|
}
|
|
if (!p->status)
|
|
p->status = DIFF_STATUS_RENAMED;
|
|
}
|
|
else if (memcmp(p->one->sha1, p->two->sha1, 20) ||
|
|
p->one->mode != p->two->mode)
|
|
p->status = DIFF_STATUS_MODIFIED;
|
|
else {
|
|
/* This is a "no-change" entry and should not
|
|
* happen anymore, but prepare for broken callers.
|
|
*/
|
|
error("feeding unmodified %s to diffcore",
|
|
p->one->path);
|
|
p->status = DIFF_STATUS_UNKNOWN;
|
|
}
|
|
}
|
|
diff_debug_queue("resolve-rename-copy done", q);
|
|
}
|
|
|
|
void diff_flush(int diff_output_style, int line_termination)
|
|
{
|
|
struct diff_queue_struct *q = &diff_queued_diff;
|
|
int i;
|
|
int inter_name_termination = '\t';
|
|
|
|
if (!line_termination)
|
|
inter_name_termination = 0;
|
|
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
if ((diff_output_style == DIFF_FORMAT_NO_OUTPUT) ||
|
|
(p->status == DIFF_STATUS_UNKNOWN))
|
|
continue;
|
|
if (p->status == 0)
|
|
die("internal error in diff-resolve-rename-copy");
|
|
switch (diff_output_style) {
|
|
case DIFF_FORMAT_PATCH:
|
|
diff_flush_patch(p);
|
|
break;
|
|
case DIFF_FORMAT_RAW:
|
|
diff_flush_raw(p, line_termination,
|
|
inter_name_termination);
|
|
break;
|
|
case DIFF_FORMAT_NAME:
|
|
diff_flush_name(p, line_termination);
|
|
break;
|
|
}
|
|
diff_free_filepair(q->queue[i]);
|
|
}
|
|
free(q->queue);
|
|
q->queue = NULL;
|
|
q->nr = q->alloc = 0;
|
|
}
|
|
|
|
static void diffcore_apply_filter(const char *filter)
|
|
{
|
|
int i;
|
|
struct diff_queue_struct *q = &diff_queued_diff;
|
|
struct diff_queue_struct outq;
|
|
outq.queue = NULL;
|
|
outq.nr = outq.alloc = 0;
|
|
|
|
if (!filter)
|
|
return;
|
|
|
|
if (strchr(filter, DIFF_STATUS_FILTER_AON)) {
|
|
int found;
|
|
for (i = found = 0; !found && i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
if (((p->status == DIFF_STATUS_MODIFIED) &&
|
|
((p->score &&
|
|
strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
|
|
(!p->score &&
|
|
strchr(filter, DIFF_STATUS_MODIFIED)))) ||
|
|
((p->status != DIFF_STATUS_MODIFIED) &&
|
|
strchr(filter, p->status)))
|
|
found++;
|
|
}
|
|
if (found)
|
|
return;
|
|
|
|
/* otherwise we will clear the whole queue
|
|
* by copying the empty outq at the end of this
|
|
* function, but first clear the current entries
|
|
* in the queue.
|
|
*/
|
|
for (i = 0; i < q->nr; i++)
|
|
diff_free_filepair(q->queue[i]);
|
|
}
|
|
else {
|
|
/* Only the matching ones */
|
|
for (i = 0; i < q->nr; i++) {
|
|
struct diff_filepair *p = q->queue[i];
|
|
|
|
if (((p->status == DIFF_STATUS_MODIFIED) &&
|
|
((p->score &&
|
|
strchr(filter, DIFF_STATUS_FILTER_BROKEN)) ||
|
|
(!p->score &&
|
|
strchr(filter, DIFF_STATUS_MODIFIED)))) ||
|
|
((p->status != DIFF_STATUS_MODIFIED) &&
|
|
strchr(filter, p->status)))
|
|
diff_q(&outq, p);
|
|
else
|
|
diff_free_filepair(p);
|
|
}
|
|
}
|
|
free(q->queue);
|
|
*q = outq;
|
|
}
|
|
|
|
void diffcore_std(const char **paths,
|
|
int detect_rename, int rename_score,
|
|
const char *pickaxe, int pickaxe_opts,
|
|
int break_opt,
|
|
const char *orderfile,
|
|
const char *filter)
|
|
{
|
|
if (paths && paths[0])
|
|
diffcore_pathspec(paths);
|
|
if (break_opt != -1)
|
|
diffcore_break(break_opt);
|
|
if (detect_rename)
|
|
diffcore_rename(detect_rename, rename_score);
|
|
if (break_opt != -1)
|
|
diffcore_merge_broken();
|
|
if (pickaxe)
|
|
diffcore_pickaxe(pickaxe, pickaxe_opts);
|
|
if (orderfile)
|
|
diffcore_order(orderfile);
|
|
diff_resolve_rename_copy();
|
|
diffcore_apply_filter(filter);
|
|
}
|
|
|
|
|
|
void diffcore_std_no_resolve(const char **paths,
|
|
const char *pickaxe, int pickaxe_opts,
|
|
const char *orderfile,
|
|
const char *filter)
|
|
{
|
|
if (paths && paths[0])
|
|
diffcore_pathspec(paths);
|
|
if (pickaxe)
|
|
diffcore_pickaxe(pickaxe, pickaxe_opts);
|
|
if (orderfile)
|
|
diffcore_order(orderfile);
|
|
diffcore_apply_filter(filter);
|
|
}
|
|
|
|
void diff_addremove(int addremove, unsigned mode,
|
|
const unsigned char *sha1,
|
|
const char *base, const char *path)
|
|
{
|
|
char concatpath[PATH_MAX];
|
|
struct diff_filespec *one, *two;
|
|
|
|
/* This may look odd, but it is a preparation for
|
|
* feeding "there are unchanged files which should
|
|
* not produce diffs, but when you are doing copy
|
|
* detection you would need them, so here they are"
|
|
* entries to the diff-core. They will be prefixed
|
|
* with something like '=' or '*' (I haven't decided
|
|
* which but should not make any difference).
|
|
* Feeding the same new and old to diff_change()
|
|
* also has the same effect.
|
|
* Before the final output happens, they are pruned after
|
|
* merged into rename/copy pairs as appropriate.
|
|
*/
|
|
if (reverse_diff)
|
|
addremove = (addremove == '+' ? '-' :
|
|
addremove == '-' ? '+' : addremove);
|
|
|
|
if (!path) path = "";
|
|
sprintf(concatpath, "%s%s", base, path);
|
|
one = alloc_filespec(concatpath);
|
|
two = alloc_filespec(concatpath);
|
|
|
|
if (addremove != '+')
|
|
fill_filespec(one, sha1, mode);
|
|
if (addremove != '-')
|
|
fill_filespec(two, sha1, mode);
|
|
|
|
diff_queue(&diff_queued_diff, one, two);
|
|
}
|
|
|
|
void diff_change(unsigned old_mode, unsigned new_mode,
|
|
const unsigned char *old_sha1,
|
|
const unsigned char *new_sha1,
|
|
const char *base, const char *path)
|
|
{
|
|
char concatpath[PATH_MAX];
|
|
struct diff_filespec *one, *two;
|
|
|
|
if (reverse_diff) {
|
|
unsigned tmp;
|
|
const unsigned char *tmp_c;
|
|
tmp = old_mode; old_mode = new_mode; new_mode = tmp;
|
|
tmp_c = old_sha1; old_sha1 = new_sha1; new_sha1 = tmp_c;
|
|
}
|
|
if (!path) path = "";
|
|
sprintf(concatpath, "%s%s", base, path);
|
|
one = alloc_filespec(concatpath);
|
|
two = alloc_filespec(concatpath);
|
|
fill_filespec(one, old_sha1, old_mode);
|
|
fill_filespec(two, new_sha1, new_mode);
|
|
|
|
diff_queue(&diff_queued_diff, one, two);
|
|
}
|
|
|
|
void diff_unmerge(const char *path)
|
|
{
|
|
struct diff_filespec *one, *two;
|
|
one = alloc_filespec(path);
|
|
two = alloc_filespec(path);
|
|
diff_queue(&diff_queued_diff, one, two);
|
|
}
|