[PATCH v4 0/4] Extend mailmap functionality

[PATCH v4 0/4] Extend mailmap functionality

[Marius Storm-Olsen]

  v4:
  ---
  * Refactored out name and email parsing into separate function
  * Added support for only email replacement (<new> <old> construct)
  * Added "static" to functions local to compile unit only
  * Fixed C++ style comment to bash style comment in commit message
  * Added more air in the commit messages
  * Rebased ontop of latest master
  v3:
  ---
  * Make log.mailmap augment repo "/.mailmap" rather than override
  * Remove second argument of read_mailmap(<map>, <file>, <abbrev>);
  * Wrap commit messages within column 70
  v2:
  ---
  * Folded in documentation fixup from patch 4 into patch 3.


This patch series extends the mailmap functionality to:
  1) Allow the mailmap file in any location (also outside repo)
  2) Enable mailmap to match on both Name and Email

So, why would this be a good thing?

2) Lets you replace both name and email of an author/committer, based
on a name and/or email, _and_ replace email only, based on old email.
So, should you have done commits with faulty address, or if an old
email simply isn't valid anymore, you can add a mapping for that to
replace it. So, the old style mapping is
    Proper Name <commit@email.xx>

while this patch series adds support for
    <proper@email.xx> <commit@email.xx>
    Proper Name <proper@email.xx> <commit@email.xx>
    Proper Name <proper@email.xx> Commit Name <commit@email.xx>

1) Lets you keep a private mailmap file, which is not distributed with
your repository.


This extended mapping is necessary when a company wants to have their
repositories open to the public, but needs to protect the identities
of the developers. It enables you to only show nicks and standardized
emails, like 'Dev123 <bugs@company.xx>' in the public repo, but by
using an private mailmap file, map the name back to
'John Doe <john.doe@company.xx>' inside the company.


Patch serie applies cleanly on master branch (88ccb9f9), and test run
shows no regressions.


Marius Storm-Olsen (4):
  Add log.mailmap as configurational option for mailmap location
  Add find_insert_index, insert_at_index and clear_func functions to
    string_list
  Add map_user() and clear_mailmap() to mailmap
  Change current mailmap usage to do matching on both name and email of
    author/committer.

 Documentation/config.txt         |    8 ++
 Documentation/git-shortlog.txt   |   67 +++++++++---
 Documentation/pretty-formats.txt |    2 +
 builtin-blame.c                  |   52 ++++++----
 builtin-shortlog.c               |   25 ++++-
 cache.h                          |    1 +
 config.c                         |   10 ++
 mailmap.c                        |  208 +++++++++++++++++++++++++++++++------
 mailmap.h                        |    6 +-
 pretty.c                         |   59 ++++++-----
 string-list.c                    |   43 +++++++-
 string-list.h                    |    9 ++
 t/t4203-mailmap.sh               |  215 ++++++++++++++++++++++++++++++++++++++
 13 files changed, 601 insertions(+), 104 deletions(-)
 create mode 100755 t/t4203-mailmap.sh

[PATCH v4 1/4] Add log.mailmap as configurational option for mailmap location

[Marius Storm-Olsen]

This allows us to augment the repo mailmap file, and to use
mailmap files elsewhere than the repository root. Meaning
that the entries in log.mailmap will override the entries
in "./.mailmap", should they match the same.

Signed-off-by: Marius Storm-Olsen <marius@trolltech.com>
---
 Documentation/config.txt       |    8 +++
 Documentation/git-shortlog.txt |    3 +-
 builtin-blame.c                |    2 +-
 builtin-shortlog.c             |    3 +-
 cache.h                        |    1 +
 config.c                       |   10 ++++
 mailmap.c                      |   12 ++++-
 mailmap.h                      |    2 +-
 pretty.c                       |    2 +-
 t/t4203-mailmap.sh             |  109 ++++++++++++++++++++++++++++++++++++++++
 10 files changed, 145 insertions(+), 7 deletions(-)
 create mode 100755 t/t4203-mailmap.sh

diff --git a/Documentation/config.txt b/Documentation/config.txt
index e2b8775..1334d36 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1012,6 +1012,14 @@ log.showroot::
 	Tools like linkgit:git-log[1] or linkgit:git-whatchanged[1], which
 	normally hide the root commit will now show it. True by default.
 
+log.mailmap::
+	The location of an augmenting mailmap file. The default
+	mailmap, located in the root of the repository, is loaded
+	first, then the mailmap file pointed to by this variable.
+	The location of the mailmap file may be in a repository
+	subdirectory, or somewhere outside of the repository itself.
+	See linkgit:git-shortlog[1] and linkgit:git-blame[1].
+
 man.viewer::
 	Specify the programs that may be used to display help in the
 	'man' format. See linkgit:git-help[1].
diff --git a/Documentation/git-shortlog.txt b/Documentation/git-shortlog.txt
index 498bd28..66b6045 100644
--- a/Documentation/git-shortlog.txt
+++ b/Documentation/git-shortlog.txt
@@ -48,7 +48,8 @@ OPTIONS
 FILES
 -----
 
-If a file `.mailmap` exists at the toplevel of the repository,
+If a file `.mailmap` exists at the toplevel of the repository, or at the
+location pointed to by the log.mailmap configuration option,
 it is used to map an author email address to a canonical real name. This
 can be used to coalesce together commits by the same person where their
 name was spelled differently (whether with the same email address or
diff --git a/builtin-blame.c b/builtin-blame.c
index aae14ef..19edcf3 100644
--- a/builtin-blame.c
+++ b/builtin-blame.c
@@ -2394,7 +2394,7 @@ parse_done:
 		die("reading graft file %s failed: %s",
 		    revs_file, strerror(errno));
 
-	read_mailmap(&mailmap, ".mailmap", NULL);
+	read_mailmap(&mailmap, NULL);
 
 	if (!incremental)
 		setup_pager();
diff --git a/builtin-shortlog.c b/builtin-shortlog.c
index 5f9f3f0..314b6bc 100644
--- a/builtin-shortlog.c
+++ b/builtin-shortlog.c
@@ -219,7 +219,7 @@ void shortlog_init(struct shortlog *log)
 {
 	memset(log, 0, sizeof(*log));
 
-	read_mailmap(&log->mailmap, ".mailmap", &log->common_repo_prefix);
+	read_mailmap(&log->mailmap, &log->common_repo_prefix);
 
 	log->list.strdup_strings = 1;
 	log->wrap = DEFAULT_WRAPLEN;
@@ -248,6 +248,7 @@ int cmd_shortlog(int argc, const char **argv, const char *prefix)
 	struct parse_opt_ctx_t ctx;
 
 	prefix = setup_git_directory_gently(&nongit);
+	git_config(git_default_config, NULL);
 	shortlog_init(&log);
 	init_revisions(&rev, prefix);
 	parse_options_start(&ctx, argc, argv, PARSE_OPT_KEEP_DASHDASH |
diff --git a/cache.h b/cache.h
index 45e713e..3eef7ea 100644
--- a/cache.h
+++ b/cache.h
@@ -867,6 +867,7 @@ extern int user_ident_explicitly_given;
 
 extern const char *git_commit_encoding;
 extern const char *git_log_output_encoding;
+extern const char *git_log_mailmap;
 
 /* IO helper functions */
 extern void maybe_flush_or_die(FILE *, const char *);
diff --git a/config.c b/config.c
index 790405a..9ebcbbe 100644
--- a/config.c
+++ b/config.c
@@ -565,6 +565,13 @@ static int git_default_branch_config(const char *var, const char *value)
 	return 0;
 }
 
+static int git_default_log_config(const char *var, const char *value)
+{
+	if (!strcmp(var, "log.mailmap"))
+		return git_config_string(&git_log_mailmap, var, value);
+	return 0;
+}
+
 int git_default_config(const char *var, const char *value, void *dummy)
 {
 	if (!prefixcmp(var, "core."))
@@ -579,6 +586,9 @@ int git_default_config(const char *var, const char *value, void *dummy)
 	if (!prefixcmp(var, "branch."))
 		return git_default_branch_config(var, value);
 
+	if (!prefixcmp(var, "log."))
+		return git_default_log_config(var, value);
+
 	if (!strcmp(var, "pager.color") || !strcmp(var, "color.pager")) {
 		pager_use_color = git_config_bool(var,value);
 		return 0;
diff --git a/mailmap.c b/mailmap.c
index 88fc6f3..5aaee91 100644
--- a/mailmap.c
+++ b/mailmap.c
@@ -2,10 +2,11 @@
 #include "string-list.h"
 #include "mailmap.h"
 
-int read_mailmap(struct string_list *map, const char *filename, char **repo_abbrev)
+const char *git_log_mailmap;
+static int read_single_mailmap(struct string_list *map, const char *filename, char **repo_abbrev)
 {
 	char buffer[1024];
-	FILE *f = fopen(filename, "r");
+	FILE *f = (filename == NULL ? NULL : fopen(filename, "r"));
 
 	if (f == NULL)
 		return 1;
@@ -60,6 +61,13 @@ int read_mailmap(struct string_list *map, const char *filename, char **repo_abbr
 	return 0;
 }
 
+int read_mailmap(struct string_list *map, char **repo_abbrev)
+{
+	/* each failure returns 1, so >1 means both calls failed */
+	return read_single_mailmap(map, ".mailmap", repo_abbrev) +
+	       read_single_mailmap(map, git_log_mailmap, repo_abbrev) > 1;
+}
+
 int map_email(struct string_list *map, const char *email, char *name, int maxlen)
 {
 	char *p;
diff --git a/mailmap.h b/mailmap.h
index 6e48f83..ba2ee76 100644
--- a/mailmap.h
+++ b/mailmap.h
@@ -1,7 +1,7 @@
 #ifndef MAILMAP_H
 #define MAILMAP_H
 
-int read_mailmap(struct string_list *map, const char *filename, char **repo_abbrev);
+int read_mailmap(struct string_list *map, char **repo_abbrev);
 int map_email(struct string_list *mailmap, const char *email, char *name, int maxlen);
 
 #endif
diff --git a/pretty.c b/pretty.c
index cc460b5..9e03d6a 100644
--- a/pretty.c
+++ b/pretty.c
@@ -312,7 +312,7 @@ static int mailmap_name(struct strbuf *sb, const char *email)
 
 	if (!mail_map) {
 		mail_map = xcalloc(1, sizeof(*mail_map));
-		read_mailmap(mail_map, ".mailmap", NULL);
+		read_mailmap(mail_map, NULL);
 	}
 
 	if (!mail_map->nr)
diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
new file mode 100755
index 0000000..2eded8e
--- /dev/null
+++ b/t/t4203-mailmap.sh
@@ -0,0 +1,109 @@
+#!/bin/sh
+
+test_description='.mailmap configurations'
+
+. ./test-lib.sh
+
+test_expect_success setup '
+	echo one >one &&
+	git add one &&
+	test_tick &&
+	git commit -m initial &&
+	echo two >>one &&
+	git add one &&
+	git commit --author "nick1 <bugs@company.xx>" -m second
+'
+
+cat >expect <<\EOF
+A U Thor (1):
+      initial
+
+nick1 (1):
+      second
+
+EOF
+
+test_expect_success 'No mailmap' '
+	git shortlog >actual &&
+	test_cmp expect actual
+'
+
+cat >expect <<\EOF
+Repo Guy (1):
+      initial
+
+nick1 (1):
+      second
+
+EOF
+
+test_expect_success 'default .mailmap' '
+	echo "Repo Guy <author@example.com>" > .mailmap &&
+	git shortlog >actual &&
+	test_cmp expect actual
+'
+
+# Using a mailmap file in a subdirectory of the repo here, but
+# could just as well have been a file outside of the repository
+cat >expect <<\EOF
+Internal Guy (1):
+      second
+
+Repo Guy (1):
+      initial
+
+EOF
+test_expect_success 'log.mailmap set' '
+	mkdir internal_mailmap &&
+	echo "Internal Guy <bugs@company.xx>" > internal_mailmap/.mailmap &&
+	git config log.mailmap internal_mailmap/.mailmap &&
+	git shortlog >actual &&
+	test_cmp expect actual
+'
+
+cat >expect <<\EOF
+External Guy (1):
+      initial
+
+Internal Guy (1):
+      second
+
+EOF
+test_expect_success 'log.mailmap override' '
+	echo "External Guy <author@example.com>" >> internal_mailmap/.mailmap &&
+	git config log.mailmap internal_mailmap/.mailmap &&
+	git shortlog >actual &&
+	test_cmp expect actual
+'
+
+cat >expect <<\EOF
+Repo Guy (1):
+      initial
+
+nick1 (1):
+      second
+
+EOF
+
+test_expect_success 'log.mailmap file non-existant' '
+	rm internal_mailmap/.mailmap &&
+	rmdir internal_mailmap &&
+	git shortlog >actual &&
+	test_cmp expect actual
+'
+
+cat >expect <<\EOF
+A U Thor (1):
+      initial
+
+nick1 (1):
+      second
+
+EOF
+test_expect_success 'No mailmap files, but configured' '
+	rm .mailmap &&
+	git shortlog >actual &&
+	test_cmp expect actual
+'
+
+test_done
-- 
1.6.1.2.323.g37255

[PATCH v4 2/4] Add find_insert_index, insert_at_index and clear_func functions to string_list

[Marius Storm-Olsen]

string_list_find_insert_index() and string_list_insert_at_index()
enables you to see if an item is in the string_list, and to
insert at the appropriate index in the list, if not there.
This is usefull if you need to manipulate an existing item,
if present, and insert a new item if not.

Future mailmap code will use this construct to enable
complex (old_name, old_email) -> (new_name, new_email)
lookups.

The string_list_clear_func() allows to call a custom
cleanup function on each item in a string_list, which is
useful is the util member points to a complex structure.

Signed-off-by: Marius Storm-Olsen <marius@trolltech.com>
---
 string-list.c |   43 +++++++++++++++++++++++++++++++++++++++----
 string-list.h |    9 +++++++++
 2 files changed, 48 insertions(+), 4 deletions(-)

diff --git a/string-list.c b/string-list.c
index ddd83c8..15e14cf 100644
--- a/string-list.c
+++ b/string-list.c
@@ -26,10 +26,10 @@ static int get_entry_index(const struct string_list *list, const char *string,
 }
 
 /* returns -1-index if already exists */
-static int add_entry(struct string_list *list, const char *string)
+static int add_entry(int insert_at, struct string_list *list, const char *string)
 {
-	int exact_match;
-	int index = get_entry_index(list, string, &exact_match);
+	int exact_match = 0;
+	int index = insert_at != -1 ? insert_at : get_entry_index(list, string, &exact_match);
 
 	if (exact_match)
 		return -1 - index;
@@ -53,7 +53,13 @@ static int add_entry(struct string_list *list, const char *string)
 
 struct string_list_item *string_list_insert(const char *string, struct string_list *list)
 {
-	int index = add_entry(list, string);
+	return string_list_insert_at_index(-1, string, list);
+}
+
+struct string_list_item *string_list_insert_at_index(int insert_at,
+						     const char *string, struct string_list *list)
+{
+	int index = add_entry(insert_at, list, string);
 
 	if (index < 0)
 		index = -1 - index;
@@ -68,6 +74,16 @@ int string_list_has_string(const struct string_list *list, const char *string)
 	return exact_match;
 }
 
+int string_list_find_insert_index(const struct string_list *list, const char *string,
+				  int negative_existing_index)
+{
+	int exact_match;
+	int index = get_entry_index(list, string, &exact_match);
+	if (exact_match)
+		index = -1 - (negative_existing_index ? index : 0);
+	return index;
+}
+
 struct string_list_item *string_list_lookup(const char *string, struct string_list *list)
 {
 	int exact_match, i = get_entry_index(list, string, &exact_match);
@@ -94,6 +110,25 @@ void string_list_clear(struct string_list *list, int free_util)
 	list->nr = list->alloc = 0;
 }
 
+void string_list_clear_func(struct string_list *list, string_list_clear_func_t clearfunc)
+{
+	if (list->items) {
+		int i;
+		if (clearfunc) {
+			for (i = 0; i < list->nr; i++)
+				clearfunc(list->items[i].util, list->items[i].string);
+		}
+		if (list->strdup_strings) {
+			for (i = 0; i < list->nr; i++)
+				free(list->items[i].string);
+		}
+		free(list->items);
+	}
+	list->items = NULL;
+	list->nr = list->alloc = 0;
+}
+
+
 void print_string_list(const char *text, const struct string_list *p)
 {
 	int i;
diff --git a/string-list.h b/string-list.h
index 4d6a705..d32ba05 100644
--- a/string-list.h
+++ b/string-list.h
@@ -15,9 +15,18 @@ struct string_list
 void print_string_list(const char *text, const struct string_list *p);
 void string_list_clear(struct string_list *list, int free_util);
 
+/* Use this function to call a custom clear function on each util pointer */
+/* The string associated with the util pointer is passed as the second argument */
+typedef void (*string_list_clear_func_t)(void *p, const char *str);
+void string_list_clear_func(struct string_list *list, string_list_clear_func_t clearfunc);
+
 /* Use these functions only on sorted lists: */
 int string_list_has_string(const struct string_list *list, const char *string);
+int string_list_find_insert_index(const struct string_list *list, const char *string,
+				  int negative_existing_index);
 struct string_list_item *string_list_insert(const char *string, struct string_list *list);
+struct string_list_item *string_list_insert_at_index(int insert_at,
+						     const char *string, struct string_list *list);
 struct string_list_item *string_list_lookup(const char *string, struct string_list *list);
 
 /* Use these functions only on unsorted lists: */
-- 
1.6.1.2.323.g37255

[PATCH v4 3/4] Add map_user() and clear_mailmap() to mailmap

[Marius Storm-Olsen]

map_user() allows to lookup and replace both email and
name of a user, based on a new style mailmap file.

The possible mailmap definitions are now:

  proper_name <commit_email>                             # Old style
  <proper_email> <commit_email>                          # New style
  proper_name <proper_email> <commit_email>              # New style
  proper_name <proper_email> commit_name <commit_email>  # New style

map_email() operates the same as before, with the
exception that it also will to try to match on a name
passed in through the name return buffer.

clear_mailmap() is needed to now clear the more complex
mailmap structure.

Signed-off-by: Marius Storm-Olsen <marius@trolltech.com>
---
 Documentation/git-shortlog.txt |   64 ++++++++++---
 mailmap.c                      |  196 ++++++++++++++++++++++++++++++++++------
 mailmap.h                      |    4 +
 3 files changed, 222 insertions(+), 42 deletions(-)

diff --git a/Documentation/git-shortlog.txt b/Documentation/git-shortlog.txt
index 66b6045..810b7b8 100644
--- a/Documentation/git-shortlog.txt
+++ b/Documentation/git-shortlog.txt
@@ -50,20 +50,33 @@ FILES
 
 If a file `.mailmap` exists at the toplevel of the repository, or at the
 location pointed to by the log.mailmap configuration option,
-it is used to map an author email address to a canonical real name. This
-can be used to coalesce together commits by the same person where their
-name was spelled differently (whether with the same email address or
-not).
-
-Each line in the file consists, in this order, of the canonical real name
-of an author, whitespace, and an email address (enclosed by '<' and '>')
-to map to the name. Use hash '#' for comments, either on their own line,
-or after the email address.
-
-A canonical name may appear in more than one line, associated with
-different email addresses, but it doesn't make sense for a given address
-to appear more than once (if that happens, a later line overrides the
-earlier ones).
+it is used to map author and committer names and email addresses to
+canonical real names and email addresses.
+This can be used to coalesce together commits by the same person where
+their name and/or email address was spelled differently.
+
+In the simple form, each line in the file consists of the canonical real name
+of an author, whitespace, and an email address used in the commit
+(enclosed by '<' and '>') to map to the name. Thus, looks like this
+--
+	Proper Name <commit@email.xx>
+--
+
+The more complex forms are
+--
+	<proper@email.xx> <commit@email.xx>
+--
+which allows mailmap to replace only the email part of a commit.
+--
+	Proper Name <proper@email.xx> <commit@email.xx>
+--
+which allows mailmap to replace both the name and the email of a commit
+matching the specified commit email address. And
+--
+	Proper Name <proper@email.xx> Commit Name <commit@email.xx>
+--
+which allows mailmap to replace both the name and the email of a commit
+matching the specified commit name and email address.
 
 So, for example, if your history contains commits by two authors, Jane
 and Joe, whose names appear in the repository under several forms:
@@ -86,6 +99,29 @@ Jane Doe <jane@desktop.(none)>
 Joe R. Developer <joe@example.com>
 ------------
 
+Now, suppose your repository contains commits from the following authors:
+
+------------
+nick1 <bugs@company.xx>
+nick2 <bugs@company.xx>
+nick2 <nick2@company.xx>
+santa <me@company.xx>
+claus <me@company.xx>
+CTO <cto@coompany.xx>
+------------
+
+Then, you might want a `.mailmap` file looking like:
+------------
+<cto@company.xx>                       <cto@coompany.xx>
+Some Dude <some@dude.xx>         nick1 <bugs@company.xx>
+Other Author <other@author.xx>   nick2 <bugs@company.xx>
+Other Author <other@author.xx>         <nick2@company.xx>
+Santa Claus <santa.claus@northpole.xx> <me@company.xx>
+------------
+
+Use hash '#' for comments, either on their own line, or after the email address.
+
+
 Author
 ------
 Written by Jeff Garzik <jgarzik@pobox.com>
diff --git a/mailmap.c b/mailmap.c
index 5aaee91..5871f6e 100644
--- a/mailmap.c
+++ b/mailmap.c
@@ -2,7 +2,122 @@
 #include "string-list.h"
 #include "mailmap.h"
 
+#define DEBUG_MAILMAP 0
+#if DEBUG_MAILMAP
+#define debug_mm(...) fprintf(stderr, __VA_ARGS__)
+#else
+static inline void debug_mm(const char *format, ...) {}
+#endif
+
 const char *git_log_mailmap;
+
+struct mailmap_info {
+	char *name;
+	char *email;
+};
+
+struct mailmap_entry {
+	/* name and email for the simple mail-only case */
+	char *name;
+	char *email;
+
+	/* name and email for the complex mail and name matching case */
+	struct string_list namemap;
+};
+
+static void free_mailmap_info(void *p, const char *s)
+{
+	struct mailmap_info *mi = (struct mailmap_info *)p;
+	debug_mm("mailmap: -- complex: '%s' -> '%s' <%s>\n", s, mi->name, mi->email);
+	free(mi->name);
+	free(mi->email);
+}
+
+static void free_mailmap_entry(void *p, const char *s)
+{
+	struct mailmap_entry *me = (struct mailmap_entry *)p;
+	debug_mm("mailmap: removing entries for <%s>, with %d sub-entries\n", s, me->namemap.nr);
+	debug_mm("mailmap: - simple: '%s' <%s>\n", me->name, me->email);
+	free(me->name);
+	free(me->email);
+
+	me->namemap.strdup_strings = 1;
+	string_list_clear_func(&me->namemap, free_mailmap_info);
+}
+
+static void add_mapping(struct string_list *map,
+			char *new_name, char *new_email, char *old_name, char *old_email)
+{
+	struct mailmap_entry *me;
+	int index;
+	if (old_email == NULL) {
+		old_email = new_email;
+		new_email = NULL;
+	}
+
+	if ((index = string_list_find_insert_index(map, old_email, 1)) < 0) {
+		/* mailmap entry exists, invert index value */
+		index = -1 - index;
+	} else {
+		/* create mailmap entry */
+		struct string_list_item *item = string_list_insert_at_index(index, old_email, map);
+		item->util = xmalloc(sizeof(struct mailmap_entry));
+		memset(item->util, 0, sizeof(struct mailmap_entry));
+		((struct mailmap_entry *)item->util)->namemap.strdup_strings = 1;
+	}
+	me = (struct mailmap_entry *)map->items[index].util;
+
+	if (old_name == NULL) {
+		debug_mm("mailmap: adding (simple) entry for %s at index %d\n", old_email, index);
+		/* Replace current name and new email for simple entry */
+		free(me->name);
+		free(me->email);
+		if (new_name)
+			me->name = xstrdup(new_name);
+		if (new_email)
+			me->email = xstrdup(new_email);
+	} else {
+		struct mailmap_info *mi = xmalloc(sizeof(struct mailmap_info));
+		debug_mm("mailmap: adding (complex) entry for %s at index %d\n", old_email, index);
+		if (new_name)
+			mi->name = xstrdup(new_name);
+		if (new_email)
+			mi->email = xstrdup(new_email);
+		string_list_insert(old_name, &me->namemap)->util = mi;
+	}
+
+	debug_mm("mailmap:  '%s' <%s> -> '%s' <%s>\n",
+		 old_name, old_email, new_name, new_email);
+}
+
+static char *parse_name_and_email(char *buffer, char **name, char **email)
+{
+	char *left, *right, *nstart, *nend;
+	*name = *email = 0;
+
+	if ((left = strchr(buffer, '<')) == NULL)
+		return NULL;
+	if ((right = strchr(left+1, '>')) == NULL)
+		return NULL;
+	if (left+1 == right)
+		return NULL;
+
+	/* remove whitespace from beginning and end of name */
+	nstart = buffer;
+	while (isspace(*nstart) && nstart < left)
+		++nstart;
+	nend = left-1;
+	while (isspace(*nend) && nend > nstart)
+		--nend;
+
+	*name = (nstart < nend ? nstart : NULL);
+	*email = left+1;
+	*(nend+1) = '\0';
+	*right++ = '\0';
+
+	return (*right == '\0' ? NULL : right);
+}
+
 static int read_single_mailmap(struct string_list *map, const char *filename, char **repo_abbrev)
 {
 	char buffer[1024];
@@ -11,9 +126,7 @@ static int read_single_mailmap(struct string_list *map, const char *filename, ch
 	if (f == NULL)
 		return 1;
 	while (fgets(buffer, sizeof(buffer), f) != NULL) {
-		char *end_of_name, *left_bracket, *right_bracket;
-		char *name, *email;
-		int i;
+		char *name1 = 0, *email1 = 0, *name2 = 0, *email2 = 0;
 		if (buffer[0] == '#') {
 			static const char abbrev[] = "# repo-abbrev:";
 			int abblen = sizeof(abbrev) - 1;
@@ -37,25 +150,11 @@ static int read_single_mailmap(struct string_list *map, const char *filename, ch
 			}
 			continue;
 		}
-		if ((left_bracket = strchr(buffer, '<')) == NULL)
-			continue;
-		if ((right_bracket = strchr(left_bracket + 1, '>')) == NULL)
-			continue;
-		if (right_bracket == left_bracket + 1)
-			continue;
-		for (end_of_name = left_bracket;
-		     end_of_name != buffer && isspace(end_of_name[-1]);
-		     end_of_name--)
-			; /* keep on looking */
-		if (end_of_name == buffer)
-			continue;
-		name = xmalloc(end_of_name - buffer + 1);
-		strlcpy(name, buffer, end_of_name - buffer + 1);
-		email = xmalloc(right_bracket - left_bracket);
-		for (i = 0; i < right_bracket - left_bracket - 1; i++)
-			email[i] = tolower(left_bracket[i + 1]);
-		email[right_bracket - left_bracket - 1] = '\0';
-		string_list_insert(email, map)->util = name;
+		if ((name2 = parse_name_and_email(buffer, &name1, &email1)) != NULL)
+			parse_name_and_email(name2, &name2, &email2);
+
+		if (email1)
+			add_mapping(map, name1, email1, name2, email2);
 	}
 	fclose(f);
 	return 0;
@@ -63,22 +162,37 @@ static int read_single_mailmap(struct string_list *map, const char *filename, ch
 
 int read_mailmap(struct string_list *map, char **repo_abbrev)
 {
+	map->strdup_strings = 1;
 	/* each failure returns 1, so >1 means both calls failed */
 	return read_single_mailmap(map, ".mailmap", repo_abbrev) +
 	       read_single_mailmap(map, git_log_mailmap, repo_abbrev) > 1;
 }
 
-int map_email(struct string_list *map, const char *email, char *name, int maxlen)
+void clear_mailmap(struct string_list *map)
+{
+	debug_mm("mailmap: clearing %d entries...\n", map->nr);
+	map->strdup_strings = 1;
+	string_list_clear_func(map, free_mailmap_entry);
+	debug_mm("mailmap: cleared\n");
+}
+
+int map_user(struct string_list *map,
+	     char *email, int maxlen_email, char *name, int maxlen_name)
 {
 	char *p;
 	struct string_list_item *item;
+	struct mailmap_entry *me;
 	char buf[1024], *mailbuf;
 	int i;
 
-	/* autocomplete common developers */
+	/* figure out space requirement for email */
 	p = strchr(email, '>');
-	if (!p)
-		return 0;
+	if (!p) {
+		/* email passed in might not be wrapped in <>, but end with a \0 */
+		p = memchr(email, '\0', maxlen_email);
+		if (p == 0)
+			return 0;
+	}
 	if (p - email + 1 < sizeof(buf))
 		mailbuf = buf;
 	else
@@ -88,13 +202,39 @@ int map_email(struct string_list *map, const char *email, char *name, int maxlen
 	for (i = 0; i < p - email; i++)
 		mailbuf[i] = tolower(email[i]);
 	mailbuf[i] = 0;
+
+	debug_mm("map_user: map '%s' <%s>\n", name, mailbuf);
 	item = string_list_lookup(mailbuf, map);
+	if (item != NULL) {
+		me = (struct mailmap_entry *)item->util;
+		if (me->namemap.nr) {
+			/* The item has multiple items, so we'll look up on name too */
+			/* If the name is not found, we choose the simple entry      */
+			struct string_list_item *subitem = string_list_lookup(name, &me->namemap);
+			if (subitem)
+				item = subitem;
+		}
+	}
 	if (mailbuf != buf)
 		free(mailbuf);
 	if (item != NULL) {
-		const char *realname = (const char *)item->util;
-		strlcpy(name, realname, maxlen);
+		struct mailmap_info *mi = (struct mailmap_info *)item->util;
+		if (mi->name == NULL && (mi->email == NULL || maxlen_email == 0)) {
+			debug_mm("map_user:  -- (no simple mapping)\n");
+			return 0;
+		}
+		if (maxlen_email && mi->email)
+			strlcpy(email, mi->email, maxlen_email);
+		if (maxlen_name && mi->name)
+			strlcpy(name, mi->name, maxlen_name);
+		debug_mm("map_user:  to '%s' <%s>\n", name, mi->email ? mi->email : "");
 		return 1;
 	}
+	debug_mm("map_user:  --\n");
 	return 0;
 }
+
+int map_email(struct string_list *map, const char *email, char *name, int maxlen)
+{
+	return map_user(map, (char *)email, 0, name, maxlen);
+}
diff --git a/mailmap.h b/mailmap.h
index ba2ee76..4b2ca3a 100644
--- a/mailmap.h
+++ b/mailmap.h
@@ -2,6 +2,10 @@
 #define MAILMAP_H
 
 int read_mailmap(struct string_list *map, char **repo_abbrev);
+void clear_mailmap(struct string_list *map);
+
 int map_email(struct string_list *mailmap, const char *email, char *name, int maxlen);
+int map_user(struct string_list *mailmap,
+	     char *email, int maxlen_email, char *name, int maxlen_name);
 
 #endif
-- 
1.6.1.2.323.g37255

[PATCH v4 4/4] Change current mailmap usage to do matching on both name and email of author/committer.

[Marius Storm-Olsen]

Signed-off-by: Marius Storm-Olsen <marius@trolltech.com>
---
 Documentation/pretty-formats.txt |    2 +
 builtin-blame.c                  |   50 +++++++++++-------
 builtin-shortlog.c               |   22 ++++++--
 pretty.c                         |   57 +++++++++++----------
 t/t4203-mailmap.sh               |  106 ++++++++++++++++++++++++++++++++++++++
 5 files changed, 186 insertions(+), 51 deletions(-)

diff --git a/Documentation/pretty-formats.txt b/Documentation/pretty-formats.txt
index 3d87d3e..28808b7 100644
--- a/Documentation/pretty-formats.txt
+++ b/Documentation/pretty-formats.txt
@@ -103,6 +103,7 @@ The placeholders are:
 - '%an': author name
 - '%aN': author name (respecting .mailmap)
 - '%ae': author email
+- '%aE': author email (respecting .mailmap)
 - '%ad': author date (format respects --date= option)
 - '%aD': author date, RFC2822 style
 - '%ar': author date, relative
@@ -111,6 +112,7 @@ The placeholders are:
 - '%cn': committer name
 - '%cN': committer name (respecting .mailmap)
 - '%ce': committer email
+- '%cE': committer email (respecting .mailmap)
 - '%cd': committer date
 - '%cD': committer date, RFC2822 style
 - '%cr': committer date, relative
diff --git a/builtin-blame.c b/builtin-blame.c
index 19edcf3..f3be9fa 100644
--- a/builtin-blame.c
+++ b/builtin-blame.c
@@ -1263,11 +1263,12 @@ struct commit_info
  * Parse author/committer line in the commit object buffer
  */
 static void get_ac_line(const char *inbuf, const char *what,
-			int bufsz, char *person, const char **mail,
+			int person_len, char *person,
+			int mail_len, char *mail,
 			unsigned long *time, const char **tz)
 {
 	int len, tzlen, maillen;
-	char *tmp, *endp, *timepos;
+	char *tmp, *endp, *timepos, *mailpos;
 
 	tmp = strstr(inbuf, what);
 	if (!tmp)
@@ -1278,10 +1279,11 @@ static void get_ac_line(const char *inbuf, const char *what,
 		len = strlen(tmp);
 	else
 		len = endp - tmp;
-	if (bufsz <= len) {
+	if (person_len <= len) {
 	error_out:
 		/* Ugh */
-		*mail = *tz = "(unknown)";
+		*tz = "(unknown)";
+		strcpy(mail, *tz);
 		*time = 0;
 		return;
 	}
@@ -1304,9 +1306,10 @@ static void get_ac_line(const char *inbuf, const char *what,
 	*tmp = 0;
 	while (*tmp != ' ')
 		tmp--;
-	*mail = tmp + 1;
+	mailpos = tmp + 1;
 	*tmp = 0;
 	maillen = timepos - tmp;
+	memcpy(mail, mailpos, maillen);
 
 	if (!mailmap.nr)
 		return;
@@ -1315,20 +1318,23 @@ static void get_ac_line(const char *inbuf, const char *what,
 	 * mailmap expansion may make the name longer.
 	 * make room by pushing stuff down.
 	 */
-	tmp = person + bufsz - (tzlen + 1);
+	tmp = person + person_len - (tzlen + 1);
 	memmove(tmp, *tz, tzlen);
 	tmp[tzlen] = 0;
 	*tz = tmp;
 
-	tmp = tmp - (maillen + 1);
-	memmove(tmp, *mail, maillen);
-	tmp[maillen] = 0;
-	*mail = tmp;
-
 	/*
-	 * Now, convert e-mail using mailmap
+	 * Now, convert both name and e-mail using mailmap
 	 */
-	map_email(&mailmap, tmp + 1, person, tmp-person-1);
+	if(map_user(&mailmap, mail+1, mail_len-1, person, tmp-person-1)) {
+		/* Add a trailing '>' to email, since map_user returns plain emails
+		   Note: It already has '<', since we replace from mail+1 */
+		mailpos = memchr(mail, '\0', mail_len);
+		if (mailpos && mailpos-mail < mail_len - 1) {
+			*mailpos = '>';
+			*(mailpos+1) = '\0';
+		}
+	}
 }
 
 static void get_commit_info(struct commit *commit,
@@ -1337,8 +1343,10 @@ static void get_commit_info(struct commit *commit,
 {
 	int len;
 	char *tmp, *endp, *reencoded, *message;
-	static char author_buf[1024];
-	static char committer_buf[1024];
+	static char author_name[1024];
+	static char author_mail[1024];
+	static char committer_name[1024];
+	static char committer_mail[1024];
 	static char summary_buf[1024];
 
 	/*
@@ -1356,9 +1364,11 @@ static void get_commit_info(struct commit *commit,
 	}
 	reencoded = reencode_commit_message(commit, NULL);
 	message   = reencoded ? reencoded : commit->buffer;
-	ret->author = author_buf;
+	ret->author = author_name;
+	ret->author_mail = author_mail;
 	get_ac_line(message, "\nauthor ",
-		    sizeof(author_buf), author_buf, &ret->author_mail,
+		    sizeof(author_name), author_name,
+		    sizeof(author_mail), author_mail,
 		    &ret->author_time, &ret->author_tz);
 
 	if (!detailed) {
@@ -1366,9 +1376,11 @@ static void get_commit_info(struct commit *commit,
 		return;
 	}
 
-	ret->committer = committer_buf;
+	ret->committer = committer_name;
+	ret->committer_mail = committer_mail;
 	get_ac_line(message, "\ncommitter ",
-		    sizeof(committer_buf), committer_buf, &ret->committer_mail,
+		    sizeof(committer_name), committer_name,
+		    sizeof(committer_mail), committer_mail,
 		    &ret->committer_time, &ret->committer_tz);
 
 	ret->summary = summary_buf;
diff --git a/builtin-shortlog.c b/builtin-shortlog.c
index 314b6bc..badd912 100644
--- a/builtin-shortlog.c
+++ b/builtin-shortlog.c
@@ -40,6 +40,7 @@ static void insert_one_record(struct shortlog *log,
 	char *buffer, *p;
 	struct string_list_item *item;
 	char namebuf[1024];
+	char emailbuf[1024];
 	size_t len;
 	const char *eol;
 	const char *boemail, *eoemail;
@@ -51,7 +52,19 @@ static void insert_one_record(struct shortlog *log,
 	eoemail = strchr(boemail, '>');
 	if (!eoemail)
 		return;
-	if (!map_email(&log->mailmap, boemail+1, namebuf, sizeof(namebuf))) {
+
+	/* copy author name to namebuf, to support matching on both name and email */
+	memcpy(namebuf, author, boemail - author);
+	len = boemail - author;
+	while(len > 0 && isspace(namebuf[len-1]))
+		len--;
+	namebuf[len] = 0;
+
+	/* copy email name to emailbuf, to allow email replacement as well */
+	memcpy(emailbuf, boemail+1, eoemail - boemail);
+	emailbuf[eoemail - boemail - 1] = 0;
+
+	if (!map_user(&log->mailmap, emailbuf, sizeof(emailbuf), namebuf, sizeof(namebuf))) {
 		while (author < boemail && isspace(*author))
 			author++;
 		for (len = 0;
@@ -67,8 +80,8 @@ static void insert_one_record(struct shortlog *log,
 
 	if (log->email) {
 		size_t room = sizeof(namebuf) - len - 1;
-		int maillen = eoemail - boemail + 1;
-		snprintf(namebuf + len, room, " %.*s", maillen, boemail);
+		int maillen = strlen(emailbuf);
+		snprintf(namebuf + len, room, " <%.*s>", maillen, emailbuf);
 	}
 
 	item = string_list_insert(namebuf, &log->list);
@@ -321,6 +334,5 @@ void shortlog_output(struct shortlog *log)
 
 	log->list.strdup_strings = 1;
 	string_list_clear(&log->list, 1);
-	log->mailmap.strdup_strings = 1;
-	string_list_clear(&log->mailmap, 1);
+	clear_mailmap(&log->mailmap);
 }
diff --git a/pretty.c b/pretty.c
index 9e03d6a..29f81c3 100644
--- a/pretty.c
+++ b/pretty.c
@@ -305,23 +305,14 @@ static char *logmsg_reencode(const struct commit *commit,
 	return out;
 }
 
-static int mailmap_name(struct strbuf *sb, const char *email)
+static int mailmap_name(char *email, int email_len, char *name, int name_len)
 {
 	static struct string_list *mail_map;
-	char buffer[1024];
-
 	if (!mail_map) {
 		mail_map = xcalloc(1, sizeof(*mail_map));
 		read_mailmap(mail_map, NULL);
 	}
-
-	if (!mail_map->nr)
-		return -1;
-
-	if (!map_email(mail_map, email, buffer, sizeof(buffer)))
-		return -1;
-	strbuf_addstr(sb, buffer);
-	return 0;
+	return mail_map->nr && map_user(mail_map, email, email_len, name, name_len);
 }
 
 static size_t format_person_part(struct strbuf *sb, char part,
@@ -332,6 +323,9 @@ static size_t format_person_part(struct strbuf *sb, char part,
 	int start, end, tz = 0;
 	unsigned long date = 0;
 	char *ep;
+	const char *name_start, *name_end, *mail_start, *mail_end, *msg_end = msg+len;
+	char person_name[1024];
+	char person_mail[1024];
 
 	/* advance 'end' to point to email start delimiter */
 	for (end = 0; end < len && msg[end] != '<'; end++)
@@ -345,25 +339,34 @@ static size_t format_person_part(struct strbuf *sb, char part,
 	if (end >= len - 2)
 		goto skip;
 
+	/* Seek for both name and email part */
+	name_start = msg;
+	name_end = msg+end;
+	while (name_end > name_start && isspace(*(name_end-1)))
+		name_end--;
+	mail_start = msg+end+1;
+	mail_end = mail_start;
+	while (mail_end < msg_end && *mail_end != '>')
+		mail_end++;
+	if (mail_end == msg_end)
+		goto skip;
+	end = mail_end-msg;
+
+	if (part == 'N' || part == 'E') { /* mailmap lookup */
+		strlcpy(person_name, name_start, name_end-name_start+1);
+		strlcpy(person_mail, mail_start, mail_end-mail_start+1);
+		mailmap_name(person_mail, sizeof(person_mail), person_name, sizeof(person_name));
+		name_start = person_name;
+		name_end = name_start + strlen(person_name);
+		mail_start = person_mail;
+		mail_end = mail_start +  strlen(person_mail);
+	}
 	if (part == 'n' || part == 'N') {	/* name */
-		while (end > 0 && isspace(msg[end - 1]))
-			end--;
-		if (part != 'N' || !msg[end] || !msg[end + 1] ||
-		    mailmap_name(sb, msg + end + 2) < 0)
-			strbuf_add(sb, msg, end);
+		strbuf_add(sb, name_start, name_end-name_start);
 		return placeholder_len;
 	}
-	start = ++end; /* save email start position */
-
-	/* advance 'end' to point to email end delimiter */
-	for ( ; end < len && msg[end] != '>'; end++)
-		; /* do nothing */
-
-	if (end >= len)
-		goto skip;
-
-	if (part == 'e') {	/* email */
-		strbuf_add(sb, msg + start, end - start);
+	if (part == 'e' || part == 'E') {	/* email */
+		strbuf_add(sb, mail_start, mail_end-mail_start);
 		return placeholder_len;
 	}
 
diff --git a/t/t4203-mailmap.sh b/t/t4203-mailmap.sh
index 2eded8e..c7a1238 100755
--- a/t/t4203-mailmap.sh
+++ b/t/t4203-mailmap.sh
@@ -106,4 +106,110 @@ test_expect_success 'No mailmap files, but configured' '
 	test_cmp expect actual
 '
 
+# Extended mailmap configurations should give us the following output for shortlog
+cat >expect <<\EOF
+A U Thor <author@example.com> (1):
+      initial
+
+CTO <cto@company.xx> (1):
+      seventh
+
+Other Author <other@author.xx> (2):
+      third
+      fourth
+
+Santa Claus <santa.claus@northpole.xx> (2):
+      fifth
+      sixth
+
+Some Dude <some@dude.xx> (1):
+      second
+
+EOF
+
+test_expect_success 'Shortlog output (complex mapping)' '
+	echo three >>one &&
+	git add one &&
+	test_tick &&
+	git commit --author "nick2 <bugs@company.xx>" -m third &&
+
+	echo four >>one &&
+	git add one &&
+	test_tick &&
+	git commit --author "nick2 <nick2@company.xx>" -m fourth &&
+
+	echo five >>one &&
+	git add one &&
+	test_tick &&
+	git commit --author "santa <me@company.xx>" -m fifth &&
+
+	echo six >>one &&
+	git add one &&
+	test_tick &&
+	git commit --author "claus <me@company.xx>" -m sixth &&
+
+	echo seven >>one &&
+	git add one &&
+	test_tick &&
+	git commit --author "CTO <cto@coompany.xx>" -m seventh &&
+
+	mkdir internal_mailmap &&
+	echo "Committed <committer@example.com>" > internal_mailmap/.mailmap &&
+	echo "<cto@company.xx>                       <cto@coompany.xx>" >> internal_mailmap/.mailmap &&
+	echo "Some Dude <some@dude.xx>         nick1 <bugs@company.xx>" >> internal_mailmap/.mailmap &&
+	echo "Other Author <other@author.xx>   nick2 <bugs@company.xx>" >> internal_mailmap/.mailmap &&
+	echo "Other Author <other@author.xx>         <nick2@company.xx>" >> internal_mailmap/.mailmap &&
+	echo "Santa Claus <santa.claus@northpole.xx> <me@company.xx>" >> internal_mailmap/.mailmap &&
+	echo "Santa Claus <santa.claus@northpole.xx> <me@company.xx>" >> internal_mailmap/.mailmap &&
+
+	git shortlog -e >actual &&
+	test_cmp expect actual
+
+'
+
+# git log with --pretty format which uses the name and email mailmap placemarkers
+cat >expect <<\EOF
+Author CTO <cto@coompany.xx> maps to CTO <cto@company.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author claus <me@company.xx> maps to Santa Claus <santa.claus@northpole.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author santa <me@company.xx> maps to Santa Claus <santa.claus@northpole.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author nick2 <nick2@company.xx> maps to Other Author <other@author.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author nick2 <bugs@company.xx> maps to Other Author <other@author.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author nick1 <bugs@company.xx> maps to Some Dude <some@dude.xx>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+
+Author A U Thor <author@example.com> maps to A U Thor <author@example.com>
+Committer C O Mitter <committer@example.com> maps to Committed <committer@example.com>
+EOF
+
+test_expect_success 'Log output (complex mapping)' '
+	git log --pretty=format:"Author %an <%ae> maps to %aN <%aE>%nCommitter %cn <%ce> maps to %cN <%cE>%n" >actual &&
+	test_cmp expect actual
+'
+
+# git blame
+cat >expect <<\EOF
+^3a2fdcb (A U Thor     2005-04-07 15:13:13 -0700 1) one
+7de6f99b (Some Dude    2005-04-07 15:13:13 -0700 2) two
+5815879d (Other Author 2005-04-07 15:14:13 -0700 3) three
+ff859d96 (Other Author 2005-04-07 15:15:13 -0700 4) four
+5ab6d4fa (Santa Claus  2005-04-07 15:16:13 -0700 5) five
+38a42d8b (Santa Claus  2005-04-07 15:17:13 -0700 6) six
+8ddc0386 (CTO          2005-04-07 15:18:13 -0700 7) seven
+EOF
+
+test_expect_success 'Blame output (complex mapping)' '
+	git blame one >actual &&
+	test_cmp expect actual
+'
+
 test_done
-- 
1.6.1.2.323.g37255

Re: [PATCH v4 1/4] Add log.mailmap as configurational option for mailmap location

[Junio C Hamano]

Marius Storm-Olsen <marius@trolltech.com> writes:

> diff --git a/config.c b/config.c
> index 790405a..9ebcbbe 100644
> --- a/config.c
> +++ b/config.c
> @@ -565,6 +565,13 @@ static int git_default_branch_config(const char *var, const char *value)
>  	return 0;
>  }
>  
> +static int git_default_log_config(const char *var, const char *value)
> +{
> +	if (!strcmp(var, "log.mailmap"))
> +		return git_config_string(&git_log_mailmap, var, value);
> +	return 0;
> +}
> +
>  int git_default_config(const char *var, const char *value, void *dummy)
>  {
>  	if (!prefixcmp(var, "core."))
> @@ -579,6 +586,9 @@ int git_default_config(const char *var, const char *value, void *dummy)
>  	if (!prefixcmp(var, "branch."))
>  		return git_default_branch_config(var, value);
>  
> +	if (!prefixcmp(var, "log."))
> +		return git_default_log_config(var, value);
> +

The placement of this looked *really* wrong, as mailmap is not *that*
important to most of the commands.

Initially I wondered if this should be better done inside existing
git_log_config().  I suspect that the reason you didn't do so is because
you would want to use this also in blame, which is not part of the log
family, and does not use git_log_config() (nor it should).

Which probably means that the code can stay here (it is just two strcmp
and assignment to a pointer variable), but also suggests that log.mailmap
is perhaps misnamed.

Re: [PATCH v4 1/4] Add log.mailmap as configurational option for mailmap location

[Marius Storm-Olsen]

Junio C Hamano said the following on 05.02.2009 18:44:
> Marius Storm-Olsen <marius@trolltech.com> writes:
> 
>> diff --git a/config.c b/config.c
>> index 790405a..9ebcbbe 100644
>> --- a/config.c
>> +++ b/config.c
>> @@ -565,6 +565,13 @@ static int git_default_branch_config(const char *var, const char *value)
>>  	return 0;
>>  }
>>  
>> +static int git_default_log_config(const char *var, const char *value)
>> +{
>> +	if (!strcmp(var, "log.mailmap"))
>> +		return git_config_string(&git_log_mailmap, var, value);
>> +	return 0;
>> +}
>> +
>>  int git_default_config(const char *var, const char *value, void *dummy)
>>  {
>>  	if (!prefixcmp(var, "core."))
>> @@ -579,6 +586,9 @@ int git_default_config(const char *var, const char *value, void *dummy)
>>  	if (!prefixcmp(var, "branch."))
>>  		return git_default_branch_config(var, value);
>>  
>> +	if (!prefixcmp(var, "log."))
>> +		return git_default_log_config(var, value);
>> +
> 
> The placement of this looked *really* wrong, as mailmap is not
> *that* important to most of the commands.
> 
> Initially I wondered if this should be better done inside existing 
> git_log_config().  I suspect that the reason you didn't do so is
> because you would want to use this also in blame, which is not part
> of the log family, and does not use git_log_config() (nor it
> should).
> 
> Which probably means that the code can stay here (it is just two
> strcmp and assignment to a pointer variable), but also suggests
> that log.mailmap is perhaps misnamed.


Correct, that was my reasoning behind it. Since shortlog is the only 
place in the documentation where mailmap is *directly* mentioned, it 
feels slightly tied to log. But, since blame and pretty.c also 
reference it, I needed the configuration option to be read as default.

Given that in total shortlog, blame, log, diff-tree, rev-list, show 
and whatchanged use it (the latter 5 through the pretty option), I'm 
tempted to say that it justifies its own option (mailmap.file?); but 
it would still have to be handled by git_default_config(). Renaming it 
would give it stronger reason to *be there* though.

I'm fine either way, really. Though, I think if we rename the option, 
it also justifies pulling the mailmap documentation out of 
git-shortlog.txt, into its own file, and link to it from shortlog, and 
the other commands which use it (git-blame.txt and pretty-format.txt)

I'll happily do the job, if "yay", or leave it as is if "nay".
Either way, feel free to rename log.mailmap to something else.

--
.marius

Re: [PATCH v4 1/4] Add log.mailmap as configurational option for mailmap location

[Junio C Hamano]

Marius Storm-Olsen <marius@trolltech.com> writes:

> Given that in total shortlog, blame, log, diff-tree, rev-list, show
> and whatchanged use it (the latter 5 through the pretty option), I'm
> tempted to say that it justifies its own option (mailmap.file?); but
> it would still have to be handled by git_default_config(). Renaming it
> would give it stronger reason to *be there* though.

We are in total agreement then ;-)

I also agree that it would be a good idea to introduce a shared
documentlet similar to pretty-format.txt that can be included in the
documentation pages of commands that use this name-rewriting mechanism.