cli: add support for only printing the addresses in notmuch address

The notmuch address output is much more useful for scripts with just
the addresses printed. Support this using the --output=address option.

completion/notmuch-completion.bash

@@ -472,7 +472,7 @@ _notmuch_address()
 	    return
 	    ;;
 	--output)
-	    COMPREPLY=( $( compgen -W "sender recipients count" -- "${cur}" ) )
+	    COMPREPLY=( $( compgen -W "sender recipients count address" -- "${cur}" ) )
 	    return
 	    ;;
 	--sort)

doc/man1/notmuch-address.rst

@@ -29,7 +29,7 @@ Supported options for **address** include
         intended for programs that invoke **notmuch(1)** internally. If
         omitted, the latest supported version will be used.
 
-    ``--output=(sender|recipients|count)``
+    ``--output=(sender|recipients|count|address)``
 
         Controls which information appears in the output. This option
         can be given multiple times to combine different outputs.
@@ -55,6 +55,11 @@ Supported options for **address** include
             Note: With this option, addresses are printed only after
             the whole search is finished. This may take long time.
 
+        **address**
+            Output only the email addresses instead of the full
+            mailboxes with names and email addresses. This option has
+            no effect on the JSON or S-Expression output formats.
+
     ``--deduplicate=(no|mailbox|address)``
 
         Control the deduplication of results.

notmuch-search.c

@@ -34,6 +34,7 @@ typedef enum {
     OUTPUT_SENDER	= 1 << 5,
     OUTPUT_RECIPIENTS	= 1 << 6,
     OUTPUT_COUNT	= 1 << 7,
+    OUTPUT_ADDRESS	= 1 << 8,
 } output_t;
 
 typedef enum {
@@ -370,7 +371,10 @@ print_mailbox (const search_context_t *ctx, const mailbox_t *mailbox)
 	    format->integer (format, count);
 	    format->string (format, "\t");
 	}
-	format->string (format, name_addr);
+	if (ctx->output & OUTPUT_ADDRESS)
+	    format->string (format, addr);
+	else
+	    format->string (format, name_addr);
 	format->separator (format);
     } else {
 	format->begin_map (format);
@@ -877,6 +881,7 @@ notmuch_address_command (notmuch_config_t *config, int argc, char *argv[])
 	  (notmuch_keyword_t []){ { "sender", OUTPUT_SENDER },
 				  { "recipients", OUTPUT_RECIPIENTS },
 				  { "count", OUTPUT_COUNT },
+				  { "address", OUTPUT_ADDRESS },
 				  { 0, 0 } } },
 	{ .opt_keyword = &ctx->exclude, .name = "exclude", .keywords =
 	  (notmuch_keyword_t []){ { "true", NOTMUCH_EXCLUDE_TRUE },

test/T095-address.sh

@@ -119,6 +119,42 @@ cat <<EOF >EXPECTED
 EOF
 test_expect_equal_file EXPECTED OUTPUT
 
+test_begin_subtest "--output=recipients --output=address"
+notmuch address --output=recipients --output=address '*' >OUTPUT
+cat <<EOF >EXPECTED
+allan@archlinux.org
+aur-general@archlinux.org
+olivier.berger@it-sudparis.eu
+notmuch@notmuchmail.org
+notmuch@notmuchmail.org
+keithp@keithp.com
+dottedmag@dottedmag.net
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
+test_begin_subtest "--output=sender --output=address --output=count"
+notmuch address --output=sender --output=address --output=count '*' | sort -n >OUTPUT
+cat <<EOF >EXPECTED
+1	agriffis@n01se.net
+1	aperez@igalia.com
+1	boulogne.f@gmail.com
+1	chris@chris-wilson.co.uk
+1	ingmar@exherbo.org
+1	isra@herraiz.org
+1	olivier.berger@it-sudparis.eu
+1	rollandsantimano@yahoo.com
+2	alex.boterolowry@gmail.com
+2	gzjjgod@gmail.com
+3	stewart@flamingspork.com
+4	alex.boterolowry@gmail.com
+4	jan@ryngle.com
+5	dottedmag@dottedmag.net
+5	lars@seas.harvard.edu
+7	keithp@keithp.com
+12	cworth@cworth.org
+EOF
+test_expect_equal_file EXPECTED OUTPUT
+
 test_begin_subtest "--output=count --format=json"
 # Since the iteration order of GHashTable is not specified, we
 # preprocess and sort the results to keep the order stable here.