Support nonprimary output keyword (#5273)

Fixes #4878

docs/userguide

@@ -965,7 +965,7 @@ considered.
 *Syntax*:
 ------------------------------------------------------------
 assign <criteria> [→] [workspace] [number] <workspace>
-assign <criteria> [→] output left|right|up|down|primary|<output>
+assign <criteria> [→] output left|right|up|down|primary|nonprimary|<output>
 ------------------------------------------------------------
 
 *Examples*:
@@ -997,6 +997,9 @@ assign [class="^URxvt$"] → output right
 
 # Assign urxvt to the primary output
 assign [class="^URxvt$"] → output primary
+
+# Assign urxvt to the first non-primary output
+assign [class="^URxvt$"] → output nonprimary
 ----------------------
 
 Note that you might not have a primary output configured yet. To do so, run:
@@ -2423,7 +2426,7 @@ output::
 focus left|right|down|up
 focus parent|child|floating|tiling|mode_toggle
 focus next|prev [sibling]
-focus output left|right|down|up|current|primary|next|<output1> [output2]…
+focus output left|right|down|up|current|primary|nonprimary|next|<output1> [output2]…
 ----------------------------------------------
 
 *Examples*:
@@ -2455,6 +2458,9 @@ bindsym $mod+x focus output HDMI-2
 # Focus the primary output
 bindsym $mod+x focus output primary
 
+# Cycle focus through non-primary outputs
+bindsym $mod+x focus output nonprimary
+
 # Cycle focus between outputs VGA1 and LVDS1 but not DVI0
 bindsym $mod+x move workspace to output VGA1 LVDS1
 -------------------------------------------------
@@ -2719,8 +2725,8 @@ To move a container to another RandR output (addressed by names like +LVDS1+ or
 
 *Syntax*:
 -------------------------------------------------------------------------------------
-move container to output left|right|down|up|current|primary|next|<output1> [output2]…
-move workspace to output left|right|down|up|current|primary|next|<output1> [output2]…
+move container to output left|right|down|up|current|primary|nonprimary|next|<output1> [output2]…
+move workspace to output left|right|down|up|current|primary|nonprimary|next|<output1> [output2]…
 -------------------------------------------------------------------------------------
 
 *Examples*:

release-notes/changes/3-nonprimary

@@ -0,0 +1 @@
+Support nonprimary keyword for outputs

src/commands.c

@@ -1032,11 +1032,16 @@ typedef struct user_output_name {
 typedef TAILQ_HEAD(user_output_names_head, user_output_name) user_output_names_head;
 
 static void user_output_names_add(user_output_names_head *list, const char *name) {
-    if (strcmp(name, "next") == 0) {
-        /* "next" here works like a wildcard: It "expands" to all available
-         * outputs. */
+    const bool get_non_primary = (strcasecmp("nonprimary", name) == 0);
+    if (get_non_primary || strcmp(name, "next") == 0) {
+        /* "next" (or "nonprimary") here work like a wildcard: It "expands" to
+         * all available (or non-primary) outputs. */
         Output *output;
         TAILQ_FOREACH (output, &outputs, outputs) {
+            if (get_non_primary && output->primary) {
+                continue;
+            }
+
             user_output_name *co = scalloc(sizeof(user_output_name), 1);
             co->name = sstrdup(output_primary_name(output));
             TAILQ_INSERT_TAIL(list, co, user_output_names);

src/randr.c

@@ -48,8 +48,10 @@ static Output *get_output_by_id(xcb_randr_output_t id) {
  *
  */
 Output *get_output_by_name(const char *name, const bool require_active) {
+    const bool get_primary = (strcasecmp("primary", name) == 0);
+    const bool get_non_primary = (strcasecmp("nonprimary", name) == 0);
+
     Output *output;
-    bool get_primary = (strcasecmp("primary", name) == 0);
     TAILQ_FOREACH (output, &outputs, outputs) {
         if (require_active && !output->active) {
             continue;
@@ -57,6 +59,9 @@ Output *get_output_by_name(const char *name, const bool require_active) {
         if (output->primary && get_primary) {
             return output;
         }
+        if (!output->primary && get_non_primary) {
+            return output;
+        }
         struct output_name *output_name;
         SLIST_FOREACH (output_name, &output->names_head, names) {
             if (strcasecmp(output_name->name, name) == 0) {

testcases/t/166-assign.t

@@ -326,6 +326,42 @@ is_num_children('left-bottom', 2, 'two children on left-bottom');
 kill_all_windows;
 exit_gracefully($pid);
 
+#####################################################################
+# Test assignments to primary / nonprimary outputs
+#####################################################################
+$config = <<'EOT';
+# i3 config file (v4)
+font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1
+
+fake-outputs 1024x768+0+0P,1024x768+1024+0
+
+workspace primary output fake-0
+workspace nonprimary output fake-1
+
+assign [class="current"] → output current
+assign [class="^primary$"] → output primary
+assign [class="nonprimary"] → output nonprimary
+EOT
+
+$pid = launch_with_config($config);
+
+cmd 'workspace primary';
+open_special(wm_class => 'current');
+sync_with_i3;
+is_num_children('primary', 1, 'one window in current workspace');
+
+open_special(wm_class => 'nonprimary');
+sync_with_i3;
+is_num_children('nonprimary', 1, 'one child on nonprimary');
+
+cmd 'workspace nonprimary';
+open_special(wm_class => 'primary');
+sync_with_i3;
+is_num_children('primary', 2, 'two children on primary');
+
+kill_all_windows;
+exit_gracefully($pid);
+
 #####################################################################
 # regression test: dock clients with floating assignments should not crash
 # (instead, nothing should happen - dock clients can’t float)

testcases/t/297-assign-workspace-to-output.t

@@ -86,6 +86,8 @@ workspace 5 output fake-0
 workspace 5:xxx output fake-1
 workspace 6:xxx output fake-0
 workspace 6 output fake-1
+workspace 7 output nonprimary primary
+workspace 8 output doesnotexist primary
 EOT
 
 $pid = launch_with_config($config);
@@ -98,7 +100,9 @@ do_test('5', 'fake-0', 'Numbered assignment ok');
 do_test('5:xxx', 'fake-1', 'Named assignment overrides number');
 do_test('6', 'fake-1', 'Numbered assignment ok');
 do_test('6:xxx', 'fake-0', 'Named assignment overrides number');
-do_test('7', 'fake-2', 'Numbered initialization for fake-2');
+do_test('7', 'fake-1', 'Non-primary output');
+do_test('8', 'fake-0', 'Primary output');
+do_test('9', 'fake-2', 'Numbered initialization for fake-2');
 
 cmd 'focus output fake-0, workspace foo';
 check_output('foo', 'fake-0', 'Workspace with only non-existing assigned outputs opened in current output');

testcases/t/544-focus-multiple-outputs.t

@@ -20,7 +20,7 @@ use i3test i3_config => <<EOT;
 # i3 config file (v4)
 font -misc-fixed-medium-r-normal--13-120-75-75-C-70-iso10646-1
 
-fake-outputs 1024x768+0+0,1024x768+1024+0,1024x768+0+768,1024x768+1024+768
+fake-outputs 1024x768+0+0P,1024x768+1024+0,1024x768+0+768,1024x768+1024+768
 EOT
 
 ###############################################################################
@@ -64,4 +64,19 @@ for (my $i = 0; $i < 10; $i++) {
     is(focused_output, "fake-$out", 'focus output next cycle');
 }
 
+###############################################################################
+# Use nonprimary to cycle outputs
+###############################################################################
+
+cmd 'focus output fake-0';
+is(focused_output, "fake-0", 'start from fake-0 which is the primary');
+
+my @order = (1, 2, 3);
+for (my $i = 0; $i < 10; $i++) {
+    cmd 'focus output nonprimary';
+
+    my $out = $order[$i % 3];
+    is(focused_output, "fake-$out", 'focus output nonprimary cycle');
+}
+
 done_testing;