The commit encoding is parsed by logmsg_reencode, there's no need for
the caller to re-parse it again. The reencoded message now has the new
encoding, not the original one. The caller would need to read commit
object again before parsing.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 builtin/blame.c  |  2 +-
 builtin/commit.c |  2 +-
 commit.h         |  1 +
 pretty.c         | 16 ++++++++++++----
 revision.c       |  2 +-
 5 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/builtin/blame.c b/builtin/blame.c
index 86100e9..104a948 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -1425,7 +1425,7 @@ static void get_commit_info(struct commit *commit,
        commit_info_init(ret);
 
        encoding = get_log_output_encoding();
-       message = logmsg_reencode(commit, encoding);
+       message = logmsg_reencode(commit, NULL, encoding);
        get_ac_line(message, "\nauthor ",
                    &ret->author, &ret->author_mail,
                    &ret->author_time, &ret->author_tz);
diff --git a/builtin/commit.c b/builtin/commit.c
index 4620437..d2f30d9 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -955,7 +955,7 @@ static const char *read_commit_message(const char *name)
        if (!commit)
                die(_("could not lookup commit %s"), name);
        out_enc = get_commit_output_encoding();
-       return logmsg_reencode(commit, out_enc);
+       return logmsg_reencode(commit, NULL, out_enc);
 }
 
 static int parse_and_validate_options(int argc, const char *argv[],
diff --git a/commit.h b/commit.h
index 87b4b6c..ad55213 100644
--- a/commit.h
+++ b/commit.h
@@ -101,6 +101,7 @@ struct userformat_want {
 extern int has_non_ascii(const char *text);
 struct rev_info; /* in revision.h, it circularly uses enum cmit_fmt */
 extern char *logmsg_reencode(const struct commit *commit,
+                            char **commit_encoding,
                             const char *output_encoding);
 extern void logmsg_free(char *msg, const struct commit *commit);
 extern void get_commit_format(const char *arg, struct rev_info *);
diff --git a/pretty.c b/pretty.c
index d3a82d2..c361b9b 100644
--- a/pretty.c
+++ b/pretty.c
@@ -594,6 +594,7 @@ static char *replace_encoding_header(char *buf, const char 
*encoding)
 }
 
 char *logmsg_reencode(const struct commit *commit,
+                     char **commit_encoding,
                      const char *output_encoding)
 {
        static const char *utf8 = "UTF-8";
@@ -615,9 +616,15 @@ char *logmsg_reencode(const struct commit *commit,
                            sha1_to_hex(commit->object.sha1), typename(type));
        }
 
-       if (!output_encoding || !*output_encoding)
+       if (!output_encoding || !*output_encoding) {
+               if (commit_encoding)
+                       *commit_encoding =
+                               get_header(commit, msg, "encoding");
                return msg;
+       }
        encoding = get_header(commit, msg, "encoding");
+       if (commit_encoding)
+               *commit_encoding = encoding;
        use_encoding = encoding ? encoding : utf8;
        if (same_encoding(use_encoding, output_encoding)) {
                /*
@@ -658,7 +665,8 @@ char *logmsg_reencode(const struct commit *commit,
        if (out)
                out = replace_encoding_header(out, output_encoding);
 
-       free(encoding);
+       if (!commit_encoding)
+               free(encoding);
        /*
         * If the re-encoding failed, out might be NULL here; in that
         * case we just return the commit message verbatim.
@@ -1288,7 +1296,7 @@ void format_commit_message(const struct commit *commit,
        context.commit = commit;
        context.pretty_ctx = pretty_ctx;
        context.wrap_start = sb->len;
-       context.message = logmsg_reencode(commit, output_enc);
+       context.message = logmsg_reencode(commit, NULL, output_enc);
 
        strbuf_expand(sb, format, format_commit_item, &context);
        rewrap_message_tail(sb, &context, 0, 0, 0);
@@ -1451,7 +1459,7 @@ void pretty_print_commit(const struct 
pretty_print_context *pp,
        }
 
        encoding = get_log_output_encoding();
-       msg = reencoded = logmsg_reencode(commit, encoding);
+       msg = reencoded = logmsg_reencode(commit, NULL, encoding);
 
        if (pp->fmt == CMIT_FMT_ONELINE || pp->fmt == CMIT_FMT_EMAIL)
                indent = 0;
diff --git a/revision.c b/revision.c
index 71e62d8..2e77397 100644
--- a/revision.c
+++ b/revision.c
@@ -2314,7 +2314,7 @@ static int commit_match(struct commit *commit, struct 
rev_info *opt)
         * in it.
         */
        encoding = get_log_output_encoding();
-       message = logmsg_reencode(commit, encoding);
+       message = logmsg_reencode(commit, NULL, encoding);
 
        /* Copy the commit to temporary if we are using "fake" headers */
        if (buf.len)
-- 
1.8.2.82.gc24b958

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