git/test-path-utils.c
Jiang Xin e02ca72f70 path.c: refactor relative_path(), not only strip prefix
Original design of relative_path() is simple, just strip the prefix
(*base) from the absolute path (*abs).

In most cases, we need a real relative path, such as: ../foo,
../../bar.  That's why there is another reimplementation
(path_relative()) in quote.c.

Borrow some codes from path_relative() in quote.c to refactor
relative_path() in path.c, so that it could return real relative
path, and user can reuse this function without reimplementing
his/her own.  The function path_relative() in quote.c will be
substituted, and I would use the new relative_path() function when
implementing the interactive git-clean later.

Different results for relative_path() before and after this refactor:

    abs path  base path  relative (original)  relative (refactor)
    ========  =========  ===================  ===================
    /a/b      /a/b       .                    ./
    /a/b/     /a/b       .                    ./
    /a        /a/b/      /a                   ../
    /         /a/b/      /                    ../../
    /a/c      /a/b/      /a/c                 ../c
    /x/y      /a/b/      /x/y                 ../../x/y

    a/b/      a/b/       .                    ./
    a/b/      a/b        .                    ./
    a         a/b        a                    ../
    x/y       a/b/       x/y                  ../../x/y
    a/c       a/b        a/c                  ../c

    (empty)   (null)     (empty)              ./
    (empty)   (empty)    (empty)              ./
    (empty)   /a/b       (empty)              ./
    (null)    (null)     (null)               ./
    (null)    (empty)    (null)               ./
    (null)    /a/b       (segfault)           ./

You may notice that return value "." has been changed to "./".
It is because:

 * Function quote_path_relative() in quote.c will show the relative
   path as "./" if abs(in) and base(prefix) are the same.

 * Function relative_path() is called only once (in setup.c), and
   it will be OK for the return value as "./" instead of ".".

Signed-off-by: Jiang Xin <worldhello.net@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-06-26 09:59:00 -07:00

137 lines
3.5 KiB
C

#include "cache.h"
#include "string-list.h"
/*
* A "string_list_each_func_t" function that normalizes an entry from
* GIT_CEILING_DIRECTORIES. If the path is unusable for some reason,
* die with an explanation.
*/
static int normalize_ceiling_entry(struct string_list_item *item, void *unused)
{
const char *ceil = item->string;
int len = strlen(ceil);
char buf[PATH_MAX+1];
if (len == 0)
die("Empty path is not supported");
if (len > PATH_MAX)
die("Path \"%s\" is too long", ceil);
if (!is_absolute_path(ceil))
die("Path \"%s\" is not absolute", ceil);
if (normalize_path_copy(buf, ceil) < 0)
die("Path \"%s\" could not be normalized", ceil);
len = strlen(buf);
if (len > 1 && buf[len-1] == '/')
die("Normalized path \"%s\" ended with slash", buf);
free(item->string);
item->string = xstrdup(buf);
return 1;
}
static void normalize_argv_string(const char **var, const char *input)
{
if (!strcmp(input, "<null>"))
*var = NULL;
else if (!strcmp(input, "<empty>"))
*var = "";
else
*var = input;
if (*var && (**var == '<' || **var == '('))
die("Bad value: %s\n", input);
}
int main(int argc, char **argv)
{
if (argc == 3 && !strcmp(argv[1], "normalize_path_copy")) {
char *buf = xmalloc(PATH_MAX + 1);
int rv = normalize_path_copy(buf, argv[2]);
if (rv)
buf = "++failed++";
puts(buf);
return 0;
}
if (argc >= 2 && !strcmp(argv[1], "real_path")) {
while (argc > 2) {
puts(real_path(argv[2]));
argc--;
argv++;
}
return 0;
}
if (argc >= 2 && !strcmp(argv[1], "absolute_path")) {
while (argc > 2) {
puts(absolute_path(argv[2]));
argc--;
argv++;
}
return 0;
}
if (argc == 4 && !strcmp(argv[1], "longest_ancestor_length")) {
int len;
struct string_list ceiling_dirs = STRING_LIST_INIT_DUP;
char *path = xstrdup(argv[2]);
/*
* We have to normalize the arguments because under
* Windows, bash mangles arguments that look like
* absolute POSIX paths or colon-separate lists of
* absolute POSIX paths into DOS paths (e.g.,
* "/foo:/foo/bar" might be converted to
* "D:\Src\msysgit\foo;D:\Src\msysgit\foo\bar"),
* whereas longest_ancestor_length() requires paths
* that use forward slashes.
*/
if (normalize_path_copy(path, path))
die("Path \"%s\" could not be normalized", argv[2]);
string_list_split(&ceiling_dirs, argv[3], PATH_SEP, -1);
filter_string_list(&ceiling_dirs, 0,
normalize_ceiling_entry, NULL);
len = longest_ancestor_length(path, &ceiling_dirs);
string_list_clear(&ceiling_dirs, 0);
free(path);
printf("%d\n", len);
return 0;
}
if (argc >= 4 && !strcmp(argv[1], "prefix_path")) {
char *prefix = argv[2];
int prefix_len = strlen(prefix);
int nongit_ok;
setup_git_directory_gently(&nongit_ok);
while (argc > 3) {
puts(prefix_path(prefix, prefix_len, argv[3]));
argc--;
argv++;
}
return 0;
}
if (argc == 4 && !strcmp(argv[1], "strip_path_suffix")) {
char *prefix = strip_path_suffix(argv[2], argv[3]);
printf("%s\n", prefix ? prefix : "(null)");
return 0;
}
if (argc == 4 && !strcmp(argv[1], "relative_path")) {
struct strbuf sb = STRBUF_INIT;
const char *in, *prefix, *rel;
normalize_argv_string(&in, argv[2]);
normalize_argv_string(&prefix, argv[3]);
rel = relative_path(in, prefix, &sb);
if (!rel)
puts("(null)");
else
puts(strlen(rel) > 0 ? rel : "(empty)");
strbuf_release(&sb);
return 0;
}
fprintf(stderr, "%s: unknown function name: %s\n", argv[0],
argv[1] ? argv[1] : "(there was none)");
return 1;
}