This adds a prefix string to any filename arguments encountered after it
has been specified.
Signed-off-by: John Keeping <j...@keeping.me.uk>
---
Documentation/git-rev-parse.txt | 16 ++++++++
builtin/rev-parse.c | 24 ++++++++---
t/t1513-rev-parse-prefix.sh | 90 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 125 insertions(+), 5 deletions(-)
create mode 100755 t/t1513-rev-parse-prefix.sh
diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index 1f9ed6c..0ab2b77 100644
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -59,6 +59,22 @@ OPTIONS
If there is no parameter given by the user, use `<arg>`
instead.
+--prefix <arg>::
+ Behave as if 'git rev-parse' was invoked from the `<arg>`
+ subdirectory of the working tree. Any relative filenames are
+ resolved as if they are prefixed by `<arg>` and will be printed
+ in that form.
++
+This can be used to convert arguments to a command run in a subdirectory
+so that they can still be used after moving to the top-level of the
+repository. For example:
++
+----
+prefix=$(git rev-parse --show-prefix)
+cd "$(git rev-parse --show-toplevel)"
+eval "set -- $(git rev-parse --sq --prefix "$prefix" "$@")"
+----
+
--verify::
Verify that exactly one parameter is provided, and that it
can be turned into a raw 20-byte SHA-1 that can be used to
diff --git a/builtin/rev-parse.c b/builtin/rev-parse.c
index f267a1d..de894c7 100644
--- a/builtin/rev-parse.c
+++ b/builtin/rev-parse.c
@@ -212,11 +212,17 @@ static void show_datestring(const char *flag, const char
*datestr)
show(buffer);
}
-static int show_file(const char *arg)
+static int show_file(const char *arg, int output_prefix)
{
show_default();
if ((filter & (DO_NONFLAGS|DO_NOREV)) == (DO_NONFLAGS|DO_NOREV)) {
- show(arg);
+ if (output_prefix) {
+ const char *prefix = startup_info->prefix;
+ show(prefix_filename(prefix,
+ prefix ? strlen(prefix) : 0,
+ arg));
+ } else
+ show(arg);
return 1;
}
return 0;
@@ -470,6 +476,7 @@ N_("git rev-parse --parseopt [options] -- [<args>...]\n"
int cmd_rev_parse(int argc, const char **argv, const char *prefix)
{
int i, as_is = 0, verify = 0, quiet = 0, revs_count = 0, type = 0;
+ int output_prefix = 0;
unsigned char sha1[20];
const char *name = NULL;
@@ -503,7 +510,7 @@ int cmd_rev_parse(int argc, const char **argv, const char
*prefix)
const char *arg = argv[i];
if (as_is) {
- if (show_file(arg) && as_is < 2)
+ if (show_file(arg, output_prefix) && as_is < 2)
verify_filename(prefix, arg, 0);
continue;
}
@@ -527,7 +534,7 @@ int cmd_rev_parse(int argc, const char **argv, const char
*prefix)
as_is = 2;
/* Pass on the "--" if we show anything but
files.. */
if (filter & (DO_FLAGS | DO_REVS))
- show_file(arg);
+ show_file(arg, 0);
continue;
}
if (!strcmp(arg, "--default")) {
@@ -535,6 +542,13 @@ int cmd_rev_parse(int argc, const char **argv, const char
*prefix)
i++;
continue;
}
+ if (!strcmp(arg, "--prefix")) {
+ prefix = argv[i+1];
+ startup_info->prefix = prefix;
+ output_prefix = 1;
+ i++;
+ continue;
+ }
if (!strcmp(arg, "--revs-only")) {
filter &= ~DO_NOREV;
continue;
@@ -754,7 +768,7 @@ int cmd_rev_parse(int argc, const char **argv, const char
*prefix)
if (verify)
die_no_single_rev(quiet);
as_is = 1;
- if (!show_file(arg))
+ if (!show_file(arg, output_prefix))
continue;
verify_filename(prefix, arg, 1);
}
diff --git a/t/t1513-rev-parse-prefix.sh b/t/t1513-rev-parse-prefix.sh
new file mode 100755
index 0000000..5ef48d2
--- /dev/null
+++ b/t/t1513-rev-parse-prefix.sh
@@ -0,0 +1,90 @@
+#!/bin/sh
+
+test_description='Tests for rev-parse --prefix'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+ mkdir -p sub1/sub2 &&
+ echo top >top &&
+ echo file1 >sub1/file1 &&
+ echo file2 >sub1/sub2/file2 &&
+ git add top sub1/file1 sub1/sub2/file2 &&
+ git commit -m commit
+'
+
+test_expect_success 'empty prefix -- file' '
+ git rev-parse --prefix "" -- top sub1/file1 >actual &&
+ cat <<-EOF >expected &&
+ --
+ top
+ sub1/file1
+ EOF
+ test_cmp expected actual
+'
+
+test_expect_success 'valid prefix -- file' '
+ git rev-parse --prefix sub1/ -- file1 sub2/file2 >actual &&
+ cat <<-EOF >expected &&
+ --
+ sub1/file1
+ sub1/sub2/file2
+ EOF
+ test_cmp expected actual
+'
+
+test_expect_success 'valid prefix -- ../file' '
+ git rev-parse --prefix sub1/ -- ../top sub2/file2 >actual &&
+ cat <<-EOF >expected &&
+ --
+ sub1/../top
+ sub1/sub2/file2
+ EOF
+ test_cmp expected actual
+'
+
+test_expect_success 'empty prefix HEAD:./path' '
+ git rev-parse --prefix "" HEAD:./top >actual &&
+ git rev-parse HEAD:top >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'valid prefix HEAD:./path' '
+ git rev-parse --prefix sub1/ HEAD:./file1 >actual &&
+ git rev-parse HEAD:sub1/file1 >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'valid prefix HEAD:../path' '
+ git rev-parse --prefix sub1/ HEAD:../top >actual &&
+ git rev-parse HEAD:top >expected &&
+ test_cmp expected actual
+'
+
+test_expect_success 'disambiguate path with valid prefix' '
+ git rev-parse --prefix sub1/ file1 >actual &&
+ cat <<-EOF >expected &&
+ sub1/file1
+ EOF
+ test_cmp expected actual
+'
+
+test_expect_success 'file and refs with prefix' '
+ git rev-parse --prefix sub1/ master file1 >actual &&
+ cat <<-EOF >expected &&
+ $(git rev-parse master)
+ sub1/file1
+ EOF
+ test_cmp expected actual
+'
+
+test_expect_success 'two-levels deep' '
+ git rev-parse --prefix sub1/sub2/ -- file2 >actual &&
+ cat <<-EOF >expected &&
+ --
+ sub1/sub2/file2
+ EOF
+ test_cmp expected actual
+'
+
+test_done
--
1.8.2.694.ga76e9c3.dirty
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