8f3671dcd9
This patch removes the custom diff generation code from the show_diff_empty() function. Instead, just use show_differences(). This reduces the code size; but more importantly, it is needed for the later patch to give diff options. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
188 lines
4.2 KiB
C
188 lines
4.2 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include "cache.h"
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static char *diff_cmd = "diff -L '%s' -u -N - '%s'";
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/* Help to copy the thing properly quoted for the shell safety.
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* any single quote is replaced with '\'', and the caller is
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* expected to enclose the result within a single quote pair.
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*
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* E.g.
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* original sq_expand result
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* name ==> name ==> 'name'
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* a b ==> a b ==> 'a b'
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* a'b ==> a'\''b ==> 'a'\''b'
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*
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* NOTE! The returned memory belongs to this function so
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* do not free it.
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*/
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static char *sq_expand(char *src)
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{
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static char *buf = NULL;
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int cnt, c;
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char *cp;
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/* count bytes needed to store the quoted string. */
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for (cnt = 1, cp = src; *cp; cnt++, cp++)
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if (*cp == '\'')
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cnt += 3;
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if (! (buf = malloc(cnt)))
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return buf;
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cp = buf;
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while ((c = *src++)) {
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if (c != '\'')
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*cp++ = c;
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else {
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cp = strcpy(cp, "'\\''");
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cp += 4;
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}
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}
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*cp = 0;
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return buf;
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}
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static void show_differences(char *name, char *label, void *old_contents,
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unsigned long long old_size)
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{
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FILE *f;
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char *name_sq = sq_expand(name);
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char *label_sq = (name != label) ? sq_expand(label) : name_sq;
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int cmd_size = strlen(name_sq) + strlen(label_sq) + strlen(diff_cmd);
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char *cmd = malloc(cmd_size);
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fflush(stdout);
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snprintf(cmd, cmd_size, diff_cmd, label_sq, name_sq);
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f = popen(cmd, "w");
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if (old_size)
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fwrite(old_contents, old_size, 1, f);
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pclose(f);
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if (label_sq != name_sq)
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free(label_sq);
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free(name_sq);
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free(cmd);
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}
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static void show_diff_empty(struct cache_entry *ce)
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{
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char *old;
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unsigned long int size;
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unsigned char type[20];
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old = read_sha1_file(ce->sha1, type, &size);
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if (! old) {
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error("unable to read blob object for %s (%s)", ce->name,
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sha1_to_hex(ce->sha1));
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return;
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}
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show_differences("/dev/null", ce->name, old, size);
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}
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static const char *show_diff_usage = "show-diff [-q] [-s] [-z] [paths...]";
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static int matches_pathspec(struct cache_entry *ce, char **spec, int cnt)
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{
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int i;
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int namelen = ce_namelen(ce);
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for (i = 0; i < cnt; i++) {
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int speclen = strlen(spec[i]);
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if (! strncmp(spec[i], ce->name, speclen) &&
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speclen <= namelen &&
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(ce->name[speclen] == 0 ||
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ce->name[speclen] == '/'))
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return 1;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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int silent = 0;
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int silent_on_nonexisting_files = 0;
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int machine_readable = 0;
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int entries = read_cache();
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int i;
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while (1 < argc && argv[1][0] == '-') {
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if (!strcmp(argv[1], "-s"))
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silent_on_nonexisting_files = silent = 1;
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else if (!strcmp(argv[1], "-q"))
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silent_on_nonexisting_files = 1;
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else if (!strcmp(argv[1], "-z"))
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machine_readable = 1;
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else
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usage(show_diff_usage);
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argv++; argc--;
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}
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/* At this point, if argc == 1, then we are doing everything.
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* Otherwise argv[1] .. argv[argc-1] have the explicit paths.
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*/
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if (entries < 0) {
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perror("read_cache");
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exit(1);
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}
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for (i = 0; i < entries; i++) {
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struct stat st;
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struct cache_entry *ce = active_cache[i];
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int changed;
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unsigned long size;
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char type[20];
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void *old;
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if (1 < argc &&
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! matches_pathspec(ce, argv+1, argc-1))
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continue;
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if (ce_stage(ce)) {
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if (machine_readable)
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printf("U %s%c", ce->name, 0);
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else
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printf("%s: Unmerged\n",
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ce->name);
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while (i < entries &&
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!strcmp(ce->name, active_cache[i]->name))
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i++;
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i--; /* compensate for loop control increments */
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continue;
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}
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if (stat(ce->name, &st) < 0) {
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if (errno == ENOENT && silent_on_nonexisting_files)
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continue;
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if (machine_readable)
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printf("X %s%c", ce->name, 0);
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else {
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printf("%s: %s\n", ce->name, strerror(errno));
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if (errno == ENOENT)
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show_diff_empty(ce);
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}
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continue;
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}
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changed = cache_match_stat(ce, &st);
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if (!changed)
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continue;
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if (!machine_readable)
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printf("%s: %s\n", ce->name, sha1_to_hex(ce->sha1));
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else {
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printf("%s %s%c", sha1_to_hex(ce->sha1), ce->name, 0);
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continue;
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}
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if (silent)
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continue;
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old = read_sha1_file(ce->sha1, type, &size);
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if (! old)
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error("unable to read blob object for %s (%s)",
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ce->name, sha1_to_hex(ce->sha1));
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else
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show_differences(ce->name, ce->name, old, size);
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free(old);
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}
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return 0;
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}
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