config: allow custom separators in author lists

Allow distinguishing between commas separating authors and separating
first and last names.

Amended by db: reformat NEWS entry and commit message. Tweaked
whitespace in lib/thread.cc.

9 files changed, 90 insertions, 5 deletions

diff --git a/NEWS b/NEWS
index cf8107f2..8c0ab15b 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,14 @@
+Notmuch 0.39 (UNRELEASED)
+=========================
+
+General
+-------
+
+Allow to customize the separator between individual and matched and
+non-matched authors when showing threads. See
+`search.authors_separator` and `search.authors_matched_separator` in
+notmuch-config(1).
+
 Notmuch 0.38.3 (2024-03-09)
 ===========================
 
diff --git a/doc/man1/notmuch-config.rst b/doc/man1/notmuch-config.rst
index bd34afa4..5106655f 100644
--- a/doc/man1/notmuch-config.rst
+++ b/doc/man1/notmuch-config.rst
@@ -273,6 +273,19 @@ paths are presumed relative to `$HOME` for items in section
     Default: empty list. Note that :any:`notmuch-setup(1)` puts
     ``deleted;spam`` here when creating new configuration file.
 
+.. nmconfig:: search.authors_separator
+
+    The string to separate authors when showing a thread.
+
+    Default: ,
+
+.. nmconfig:: search.authors_matched_separator
+
+    The string to separate matched from non-matched authors when showing a
+    thread.
+
+    Default: |
+
 .. nmconfig:: show.extra_headers
 
     By default :any:`notmuch-show(1)` includes the following headers
diff --git a/lib/config.cc b/lib/config.cc
index 6cd15fab..acb397ec 100644
--- a/lib/config.cc
+++ b/lib/config.cc
@@ -608,6 +608,10 @@ _notmuch_config_key_to_string (notmuch_config_key_t key)
 	return "database.autocommit";
     case NOTMUCH_CONFIG_EXTRA_HEADERS:
 	return "show.extra_headers";
+    case NOTMUCH_CONFIG_AUTHORS_SEPARATOR:
+	return "search.authors_separator";
+    case NOTMUCH_CONFIG_AUTHORS_MATCHED_SEPARATOR:
+	return "search.authors_matched_separator";
     case NOTMUCH_CONFIG_INDEX_AS_TEXT:
 	return "index.as_text";
     default:
@@ -658,6 +662,10 @@ _notmuch_config_default (notmuch_database_t *notmuch, notmuch_config_key_t key)
 	return "";
     case NOTMUCH_CONFIG_AUTOCOMMIT:
 	return "8000";
+    case NOTMUCH_CONFIG_AUTHORS_SEPARATOR:
+	return ", ";
+    case NOTMUCH_CONFIG_AUTHORS_MATCHED_SEPARATOR:
+	return "| ";
     case NOTMUCH_CONFIG_EXTRA_HEADERS:
     case NOTMUCH_CONFIG_HOOK_DIR:
     case NOTMUCH_CONFIG_BACKUP_DIR:
diff --git a/lib/notmuch.h b/lib/notmuch.h
index 4e2b0fa4..937fa24e 100644
--- a/lib/notmuch.h
+++ b/lib/notmuch.h
@@ -2565,6 +2565,8 @@ typedef enum {
     NOTMUCH_CONFIG_AUTOCOMMIT,
     NOTMUCH_CONFIG_EXTRA_HEADERS,
     NOTMUCH_CONFIG_INDEX_AS_TEXT,
+    NOTMUCH_CONFIG_AUTHORS_SEPARATOR,
+    NOTMUCH_CONFIG_AUTHORS_MATCHED_SEPARATOR,
     NOTMUCH_CONFIG_LAST
 } notmuch_config_key_t;
 
diff --git a/lib/thread.cc b/lib/thread.cc
index 60e9a666..168a9e8b 100644
--- a/lib/thread.cc
+++ b/lib/thread.cc
@@ -122,21 +122,28 @@ _thread_add_matched_author (notmuch_thread_t *thread,
 
 /* Construct an authors string from matched_authors_array and
  * authors_array. The string contains matched authors first, then
- * non-matched authors (with the two groups separated by '|'). Within
- * each group, authors are listed in date order. */
+ * non-matched authors (with the two groups separated by '|' or the custom
+ * separator defined in the configuration). Within each group, authors are
+ * listed in date order and separated by ',' or the custom separator defined in
+ * the configuration. */
 static void
 _resolve_thread_authors_string (notmuch_thread_t *thread)
 {
     unsigned int i;
     char *author;
     int first_non_matched_author = 1;
+    const char *authors_sep = notmuch_config_get (thread->notmuch,
+						  NOTMUCH_CONFIG_AUTHORS_SEPARATOR);
+    const char *authors_matched_sep = notmuch_config_get (thread->notmuch,
+							  NOTMUCH_CONFIG_AUTHORS_MATCHED_SEPARATOR);
 
     /* First, list all matched authors in date order. */
     for (i = 0; i < thread->matched_authors_array->len; i++) {
 	author = (char *) g_ptr_array_index (thread->matched_authors_array, i);
 	if (thread->authors)
-	    thread->authors = talloc_asprintf (thread, "%s, %s",
+	    thread->authors = talloc_asprintf (thread, "%s%s%s",
 					       thread->authors,
+					       authors_sep,
 					       author);
 	else
 	    thread->authors = author;
@@ -149,12 +156,14 @@ _resolve_thread_authors_string (notmuch_thread_t *thread)
 					  author, NULL, NULL))
 	    continue;
 	if (first_non_matched_author) {
-	    thread->authors = talloc_asprintf (thread, "%s| %s",
+	    thread->authors = talloc_asprintf (thread, "%s%s%s",
 					       thread->authors,
+					       authors_matched_sep,
 					       author);
 	} else {
-	    thread->authors = talloc_asprintf (thread, "%s, %s",
+	    thread->authors = talloc_asprintf (thread, "%s%s%s",
 					       thread->authors,
+					       authors_sep,
 					       author);
 	}
 
diff --git a/test/T030-config.sh b/test/T030-config.sh
index 621e0b69..1d2b7df8 100755
--- a/test/T030-config.sh
+++ b/test/T030-config.sh
@@ -63,6 +63,8 @@ index.as_text=
 maildir.synchronize_flags=true
 new.ignore=
 new.tags=unread;inbox
+search.authors_matched_separator=| 
+search.authors_separator=, 
 search.exclude_tags=
 user.name=Notmuch Test Suite
 user.other_email=test_suite_other@notmuchmail.org;test_suite@otherdomain.org
diff --git a/test/T055-path-config.sh b/test/T055-path-config.sh
index 1feb5624..049b745e 100755
--- a/test/T055-path-config.sh
+++ b/test/T055-path-config.sh
@@ -303,6 +303,8 @@ index.as_text=
 maildir.synchronize_flags=true
 new.ignore=
 new.tags=unread;inbox
+search.authors_matched_separator=| 
+search.authors_separator=, 
 search.exclude_tags=
 user.name=Notmuch Test Suite
 user.other_email=test_suite_other@notmuchmail.org;test_suite@otherdomain.org
@@ -325,6 +327,8 @@ database.mail_root
 database.path
 maildir.synchronize_flags
 new.tags
+search.authors_matched_separator
+search.authors_separator
 user.name
 user.other_email
 user.primary_email
diff --git a/test/T206-author-separator.sh b/test/T206-author-separator.sh
new file mode 100755
index 00000000..b8b1afb4
--- /dev/null
+++ b/test/T206-author-separator.sh
@@ -0,0 +1,26 @@
+#!/usr/bin/env bash
+test_description="custom separator for authors"
+. $(dirname "$0")/test-lib.sh || exit 1
+
+test_begin_subtest "Adding parent message"
+generate_message [body]=findme [id]=new-parent-id [subject]=author-reorder-threadtest '[from]="User <user@example.com>"' '[date]="Sat, 01 Jan 2000 12:00:00 -0000"'
+output=$(NOTMUCH_NEW)
+test_expect_equal "$output" "Added 1 new message to the database."
+
+test_begin_subtest "Adding initial child message"
+generate_message [body]=findme "[in-reply-to]=\<new-parent-id\>" [subject]=author-reorder-threadtest '[from]="last name, first name <user1@example.com>"' '[date]="Sat, 01 Jan 2000 12:01:00 -0000"'
+output=$(NOTMUCH_NEW)
+test_expect_equal "$output" "Added 1 new message to the database."
+
+test_begin_subtest "Adding second child message"
+generate_message [body]=findme "[in-reply-to]=\<new-parent-id\>" [subject]=author-reorder-threadtest '[from]="first last <user2@example.com>"' '[date]="Sat, 01 Jan 2000 12:02:00 -0000"'
+output=$(NOTMUCH_NEW)
+test_expect_equal "$output" "Added 1 new message to the database."
+
+test_begin_subtest "Custom separarator is used"
+notmuch config set search.authors_matched_separator "#"
+notmuch config set search.authors_separator ";"
+output=$(notmuch search from:user | notmuch_search_sanitize)
+test_expect_equal "$output" "thread:XXX   2000-01-01 [1/3] User#last name, first name;first last; author-reorder-threadtest (inbox unread)"
+
+test_done
diff --git a/test/T590-libconfig.sh b/test/T590-libconfig.sh
index 9326ba3e..9b364895 100755
--- a/test/T590-libconfig.sh
+++ b/test/T590-libconfig.sh
@@ -441,6 +441,8 @@ cat <<'EOF' >EXPECTED
 11: '8000'
 12: 'NULL'
 13: ''
+14: ', '
+15: '| '
 == stderr ==
 EOF
 unset MAILDIR
@@ -725,6 +727,8 @@ test_expect_equal_file EXPECTED OUTPUT
 
 test_begin_subtest "list by keys (ndlc)"
 notmuch config set search.exclude_tags "foo;bar;fub"
+notmuch config set search.authors_matched_separator "| "
+notmuch config set search.authors_separator ", "
 notmuch config set new.ignore "sekrit_junk"
 notmuch config set index.as_text "text/"
 cat c_head2 - c_tail <<'EOF' | test_C ${MAIL_DIR} %NULL% %NULL%
@@ -754,6 +758,8 @@ cat <<'EOF' >EXPECTED
 11: '8000'
 12: 'NULL'
 13: 'text/'
+14: ', '
+15: '| '
 == stderr ==
 EOF
 test_expect_equal_file EXPECTED OUTPUT
@@ -789,6 +795,8 @@ cat <<'EOF' >EXPECTED
 11: '8000'
 12: 'NULL'
 13: ''
+14: ', '
+15: '| '
 == stderr ==
 EOF
 test_expect_equal_file EXPECTED OUTPUT.clean
@@ -865,6 +873,8 @@ key with spaces value, with, spaces!
 maildir.synchronize_flags true
 new.ignore sekrit_junk
 new.tags unread;inbox
+search.authors_matched_separator | 
+search.authors_separator , 
 search.exclude_tags foo;bar;fub
 show.extra_headers (null)
 test.key1 testvalue1