for-each-ref: add "upstream" format field

The logic for determining the upstream ref of a branch is
somewhat complex to perform in a shell script. This patch
provides a plumbing mechanism for scripts to access the C
logic used internally by git-status, git-branch, etc.

For example:

  $ git for-each-ref \
       --format='%(refname:short) %(upstream:short)' \
       refs/heads/
  master origin/master

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-for-each-ref.txt b/Documentation/git-for-each-ref.txt
index 5061d3e4e7b8a888093c5e8c7b4cb03509391756..b362e9ed12fb8c45802d488eb5685f8842e0607d 100644 (file)
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -85,6 +85,11 @@ objectsize::
 objectname::
        The object name (aka SHA-1).
 
+upstream::
+       The name of a local ref which can be considered ``upstream''
+       from the displayed ref. Respects `:short` in the same way as
+       `refname` above.
+
 In addition to the above, for commit and tag objects, the header
 field names (`tree`, `parent`, `object`, `type`, and `tag`) can
 be used to specify the value in the header field.

diff --git a/builtin-for-each-ref.c b/builtin-for-each-ref.c
index 653dca9a5765d9a5873f5ac1b7345d2182ad7d01..8796352eb673ff1f52df13329ee99530eaa98c39 100644 (file)
--- a/builtin-for-each-ref.c
+++ b/builtin-for-each-ref.c
@@ -8,6 +8,7 @@
 #include "blob.h"
 #include "quote.h"
 #include "parse-options.h"
+#include "remote.h"
 
 /* Quoting styles */
 #define QUOTE_NONE 0
@@ -66,6 +67,7 @@ static struct {
        { "subject" },
        { "body" },
        { "contents" },
+       { "upstream" },
 };
 
 /*
@@ -682,6 +684,18 @@ static void populate_value(struct refinfo *ref)
 
                if (!prefixcmp(name, "refname"))
                        refname = ref->refname;
+               else if(!prefixcmp(name, "upstream")) {
+                       struct branch *branch;
+                       /* only local branches may have an upstream */
+                       if (prefixcmp(ref->refname, "refs/heads/"))
+                               continue;
+                       branch = branch_get(ref->refname + 11);
+
+                       if (!branch || !branch->merge || !branch->merge[0] ||
+                           !branch->merge[0]->dst)
+                               continue;
+                       refname = branch->merge[0]->dst;
+               }
                else
                        continue;
 

diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index 8bfae44a8392898453785f43c7e35b65e9c1f017..daf02d5c103a55575edeefc53643a5b3794de121 100755 (executable)
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -26,6 +26,13 @@ test_expect_success 'Create sample commit with known timestamp' '
        git tag -a -m "Tagging at $datestamp" testtag
 '
 
+test_expect_success 'Create upstream config' '
+       git update-ref refs/remotes/origin/master master &&
+       git remote add origin nowhere &&
+       git config branch.master.remote origin &&
+       git config branch.master.merge refs/heads/master
+'
+
 test_atom() {
        case "$1" in
                head) ref=refs/heads/master ;;
@@ -39,6 +46,7 @@ test_atom() {
 }
 
 test_atom head refname refs/heads/master
+test_atom head upstream refs/remotes/origin/master
 test_atom head objecttype commit
 test_atom head objectsize 171
 test_atom head objectname 67a36f10722846e891fbada1ba48ed035de75581
@@ -68,6 +76,7 @@ test_atom head contents 'Initial
 '
 
 test_atom tag refname refs/tags/testtag
+test_atom tag upstream ''
 test_atom tag objecttype tag
 test_atom tag objectsize 154
 test_atom tag objectname 98b46b1d36e5b07909de1b3886224e3e81e87322
@@ -203,6 +212,7 @@ test_expect_success 'Check format "rfc2822" date fields output' '
 
 cat >expected <<\EOF
 refs/heads/master
+refs/remotes/origin/master
 refs/tags/testtag
 EOF
 
@@ -214,6 +224,7 @@ test_expect_success 'Verify ascending sort' '
 
 cat >expected <<\EOF
 refs/tags/testtag
+refs/remotes/origin/master
 refs/heads/master
 EOF
 
@@ -224,6 +235,7 @@ test_expect_success 'Verify descending sort' '
 
 cat >expected <<\EOF
 'refs/heads/master'
+'refs/remotes/origin/master'
 'refs/tags/testtag'
 EOF
 
@@ -244,6 +256,7 @@ test_expect_success 'Quoting style: python' '
 
 cat >expected <<\EOF
 "refs/heads/master"
+"refs/remotes/origin/master"
 "refs/tags/testtag"
 EOF
 
@@ -273,6 +286,15 @@ test_expect_success 'Check short refname format' '
        test_cmp expected actual
 '
 
+cat >expected <<EOF
+origin/master
+EOF
+
+test_expect_success 'Check short upstream format' '
+       git for-each-ref --format="%(upstream:short)" refs/heads >actual &&
+       test_cmp expected actual
+'
+
 test_expect_success 'Check for invalid refname format' '
        test_must_fail git for-each-ref --format="%(refname:INVALID)"
 '