Pointing the user to $GIT_DIR/rebase-apply may encourage them to mess
around in there, which is not a good thing. With this, the user does
not have to keep the path around somewhere (because after a couple of
commands, the path may be out of scrollback buffer) when they need to
look at the patch. Bonus point for automatic pager.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 Documentation/git-am.txt               |  5 ++++-
 builtin/am.c                           | 23 ++++++++++++++++++++---
 contrib/completion/git-completion.bash |  2 +-
 t/t4150-am.sh                          |  5 +++++
 4 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/Documentation/git-am.txt b/Documentation/git-am.txt
index 12879e4029..724095e921 100644
--- a/Documentation/git-am.txt
+++ b/Documentation/git-am.txt
@@ -16,7 +16,7 @@ SYNOPSIS
         [--exclude=<path>] [--include=<path>] [--reject] [-q | --quiet]
         [--[no-]scissors] [-S[<keyid>]] [--patch-format=<format>]
         [(<mbox> | <Maildir>)...]
-'git am' (--continue | --skip | --abort)
+'git am' (--continue | --skip | --abort | --show-patch)
 
 DESCRIPTION
 -----------
@@ -167,6 +167,9 @@ default.   You can use `--no-utf8` to override this.
 --abort::
        Restore the original branch and abort the patching operation.
 
+--show-patch::
+       Show the patch being applied.
+
 DISCUSSION
 ----------
 
diff --git a/builtin/am.c b/builtin/am.c
index acfe9d3c8c..aaaf32886a 100644
--- a/builtin/am.c
+++ b/builtin/am.c
@@ -1831,8 +1831,7 @@ static void am_run(struct am_state *state, int resume)
                        git_config_get_bool("advice.amworkdir", 
&advice_amworkdir);
 
                        if (advice_amworkdir)
-                               printf_ln(_("The copy of the patch that failed 
is found in: %s"),
-                                               am_path(state, "patch"));
+                               printf_ln(_("Use 'git am --show-patch' to see 
the failed patch"));
 
                        die_user_resolve(state);
                }
@@ -2121,6 +2120,17 @@ static void am_abort(struct am_state *state)
        am_destroy(state);
 }
 
+static void show_patch(struct am_state *state)
+{
+       struct strbuf sb = STRBUF_INIT;
+
+       if (strbuf_read_file(&sb, am_path(state, msgnum(state)), 0) >= 0) {
+               setup_pager();
+               write_in_full(1, sb.buf, sb.len);
+       }
+       strbuf_release(&sb);
+}
+
 /**
  * parse_options() callback that validates and sets opt->value to the
  * PATCH_FORMAT_* enum value corresponding to `arg`.
@@ -2149,7 +2159,8 @@ enum resume_mode {
        RESUME_APPLY,
        RESUME_RESOLVED,
        RESUME_SKIP,
-       RESUME_ABORT
+       RESUME_ABORT,
+       RESUME_SHOW_PATCH
 };
 
 static int git_am_config(const char *k, const char *v, void *cb)
@@ -2249,6 +2260,9 @@ int cmd_am(int argc, const char **argv, const char 
*prefix)
                OPT_CMDMODE(0, "abort", &resume,
                        N_("restore the original branch and abort the patching 
operation."),
                        RESUME_ABORT),
+               OPT_CMDMODE(0, "show-patch", &resume,
+                       N_("show the patch being applied."),
+                       RESUME_SHOW_PATCH),
                OPT_BOOL(0, "committer-date-is-author-date",
                        &state.committer_date_is_author_date,
                        N_("lie about committer date")),
@@ -2359,6 +2373,9 @@ int cmd_am(int argc, const char **argv, const char 
*prefix)
        case RESUME_ABORT:
                am_abort(&state);
                break;
+       case RESUME_SHOW_PATCH:
+               show_patch(&state);
+               break;
        default:
                die("BUG: invalid resume value");
        }
diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index 3683c772c5..1e9105f6d5 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1077,7 +1077,7 @@ _git_am ()
 {
        __git_find_repo_path
        if [ -d "$__git_repo_path"/rebase-apply ]; then
-               __gitcomp "--skip --continue --resolved --abort"
+               __gitcomp "--skip --continue --resolved --abort --show-patch"
                return
        fi
        case "$cur" in
diff --git a/t/t4150-am.sh b/t/t4150-am.sh
index 73b67b4280..eff6455f42 100755
--- a/t/t4150-am.sh
+++ b/t/t4150-am.sh
@@ -662,6 +662,11 @@ test_expect_success 'am pauses on conflict' '
        test -d .git/rebase-apply
 '
 
+test_expect_success 'am --show-patch' '
+       git am --show-patch >actual.patch &&
+       test_cmp .git/rebase-apply/0001 actual.patch
+'
+
 test_expect_success 'am --skip works' '
        echo goodbye >expected &&
        git am --skip &&
-- 
2.16.1.205.g271f633410

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