Complement existing --show-email option with fallback
configuration variable, with tests.

Signed-off-by: Quentin Neill <quentin.ne...@gmail.com>
---
 Documentation/git-blame.txt |  2 ++
 builtin/blame.c             | 10 +++++++-
 t/t8002-blame.sh            | 62 +++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 73 insertions(+), 1 deletion(-)

diff --git a/Documentation/git-blame.txt b/Documentation/git-blame.txt
index 9f23a86..e6e947c 100644
--- a/Documentation/git-blame.txt
+++ b/Documentation/git-blame.txt
@@ -76,6 +76,8 @@ include::blame-options.txt[]
 -e::
 --show-email::
        Show the author email instead of author name (Default: off).
+       This can also be controlled via the `blame.showEmail` config
+       option.
 
 -w::
        Ignore whitespace when comparing the parent's version and
diff --git a/builtin/blame.c b/builtin/blame.c
index 8d70623..60039d3 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -2185,6 +2185,14 @@ static int git_blame_config(const char *var, const char 
*value, void *cb)
                blank_boundary = git_config_bool(var, value);
                return 0;
        }
+       if (!strcmp(var, "blame.showemail")) {
+               int *output_option = cb;
+               if (git_config_bool(var, value))
+                       *output_option |= OUTPUT_SHOW_EMAIL;
+               else
+                       *output_option &= ~OUTPUT_SHOW_EMAIL;
+               return 0;
+       }
        if (!strcmp(var, "blame.date")) {
                if (!value)
                        return config_error_nonbool(var);
@@ -2529,7 +2537,7 @@ int cmd_blame(int argc, const char **argv, const char 
*prefix)
        unsigned int range_i;
        long anchor;
 
-       git_config(git_blame_config, NULL);
+       git_config(git_blame_config, &output_option);
        init_revisions(&revs, NULL);
        revs.date_mode = blame_date_mode;
        DIFF_OPT_SET(&revs.diffopt, ALLOW_TEXTCONV);
diff --git a/t/t8002-blame.sh b/t/t8002-blame.sh
index 5cdf3f1..ff09ace 100755
--- a/t/t8002-blame.sh
+++ b/t/t8002-blame.sh
@@ -19,4 +19,66 @@ test_expect_success 'blame --show-email' '
                "<E at test dot git>" 1
 '
 
+test_expect_success 'setup showEmail tests' '
+       echo "bin: test number 1" >one &&
+       git add one &&
+       GIT_AUTHOR_NAME=name1 \
+       GIT_AUTHOR_EMAIL=ema...@test.git \
+       git commit -m First --date="2010-01-01 01:00:00" &&
+       cat >expected_n <<-\EOF &&
+       (name1 2010-01-01 01:00:00 +0000 1) bin: test number 1
+       EOF
+       cat >expected_e <<-\EOF
+       (<ema...@test.git> 2010-01-01 01:00:00 +0000 1) bin: test number 1
+       EOF
+'
+
+find_blame () {
+       sed -e 's/^[^(]*//'
+}
+
+test_expect_success 'blame with no options and no config' '
+       git blame one >blame &&
+       find_blame <blame >result &&
+       test_cmp expected_n result
+'
+
+test_expect_success 'blame with showemail options' '
+       git blame --show-email one >blame1 &&
+       find_blame <blame1 >result &&
+       test_cmp expected_e result &&
+       git blame -e one >blame2 &&
+       find_blame <blame2 >result &&
+       test_cmp expected_e result &&
+       git blame --no-show-email one >blame3 &&
+       find_blame <blame3 >result &&
+       test_cmp expected_n result
+'
+
+test_expect_success 'blame with showEmail config false' '
+       git config blame.showEmail false &&
+       git blame one >blame1 &&
+       find_blame <blame1 >result &&
+       test_cmp expected_n result &&
+       git blame --show-email one >blame2 &&
+       find_blame <blame2 >result &&
+       test_cmp expected_e result &&
+       git blame -e one >blame3 &&
+       find_blame <blame3 >result &&
+       test_cmp expected_e result &&
+       git blame --no-show-email one >blame4 &&
+       find_blame <blame4 >result &&
+       test_cmp expected_n result
+'
+
+test_expect_success 'blame with showEmail config true' '
+       git config blame.showEmail true &&
+       git blame one >blame1 &&
+       find_blame <blame1 >result &&
+       test_cmp expected_e result &&
+       git blame --no-show-email one >blame2 &&
+       find_blame <blame2 >result &&
+       test_cmp expected_n result
+'
+
 test_done
-- 
2.4.2.340.g5ecd853

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