host: the core owns the event loop; every platform becomes a vtable of optional methods

1 files changed, 64 insertions, 64 deletions

diff --git a/test/snapshots/tagnav.golden b/test/snapshots/tagnav.golden
index 297844f7..523b5fe8 100644
--- a/test/snapshots/tagnav.golden
+++ b/test/snapshots/tagnav.golden
@@ -1,6 +1,6 @@
 == snap start grid=100x30 cursor=7,2
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -15,7 +15,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -30,8 +30,8 @@
 |
 |
 == snap colon grid=100x30 cursor=36,1
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -46,7 +46,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -61,8 +61,8 @@
 |
 |
 == snap right-tag grid=100x30 cursor=80,1
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -77,7 +77,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -92,8 +92,8 @@
 |
 |
 == snap left-tag grid=100x30 cursor=36,1
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -108,7 +108,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -122,9 +122,9 @@
 |
 |
 |
-== snap down-tag grid=100x30 cursor=34,16
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+== snap down-tag grid=100x30 cursor=30,16
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -139,7 +139,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -154,8 +154,8 @@
 |
 |
 == snap up-tag grid=100x30 cursor=36,1
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -170,7 +170,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -185,8 +185,8 @@
 |
 |
 == snap up-edge grid=100x30 cursor=0,0
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -201,7 +201,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -216,8 +216,8 @@
 |
 |
 == snap topbar-word grid=100x30 cursor=3,0
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -232,7 +232,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -247,8 +247,8 @@
 |
 |
 == snap topbar-graphemes grid=100x30 cursor=5,0
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -263,7 +263,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -278,8 +278,8 @@
 |
 |
 == snap back-down grid=100x30 cursor=36,1
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -294,7 +294,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -309,8 +309,8 @@
 |
 |
 == snap arrows-still-motion grid=100x30 cursor=38,1
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -325,7 +325,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -340,8 +340,8 @@
 |
 |
 == snap back-to-body grid=100x30 cursor=7,2
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -356,7 +356,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -371,8 +371,8 @@
 |
 |
 == snap tty-on grid=100x30 cursor=54,4
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del  $ /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt$ /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        $ ls
 |     2 beta                                         w.txt
 |     3 gamma                                        $
@@ -387,7 +387,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -402,8 +402,8 @@
 |
 |
 == snap tty-tag grid=100x30 cursor=80,1
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del  $ /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt$ /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -418,7 +418,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -433,8 +433,8 @@
 |
 |
 == snap tty-restored grid=100x30 cursor=54,4
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del  $ /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt$ /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        $ ls
 |     2 beta                                         w.txt
 |     3 gamma                                        $
@@ -449,7 +449,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -463,9 +463,9 @@
 |
 |
 |
-== snap topbar-dollar grid=100x30 cursor=56,0
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del  $ /tmp/pardes-snap/tagnav/cwd New Del Filter
+== snap topbar-dollar grid=100x30 cursor=74,0
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt$ /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        $ ls
 |     2 beta                                         w.txt
 |     3 gamma                                        $
@@ -480,7 +480,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -494,9 +494,9 @@
 |
 |
 |
-== snap topbar-dump-word grid=100x30 cursor=32,0
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del  $ /tmp/pardes-snap/tagnav/cwd New Del Filter
+== snap topbar-dump-word grid=100x30 cursor=50,0
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt$ /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        $ ls
 |     2 beta                                         w.txt
 |     3 gamma                                        $
@@ -511,7 +511,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -526,8 +526,8 @@
 |
 |
 == snap topbar-exec grid=100x30 cursor=7,2
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill Restore /tmp/pardes-snap/tagnav/dump.zon
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del  $ /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill Restore /tmp/pardes-snap
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt$ /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        $ ls
 |     2 beta                                         w.txt
 |     3 gamma                                        $
@@ -542,7 +542,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -556,9 +556,9 @@
 |
 |
 |
-== snap topbar-restore-word grid=100x30 cursor=58,0
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill Restore /tmp/pardes-snap/tagnav/dump.zon
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del  $ /tmp/pardes-snap/tagnav/cwd New Del Filter
+== snap topbar-restore-word grid=100x30 cursor=76,0
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill Restore /tmp/pardes-snap
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt$ /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        $ ls
 |     2 beta                                         w.txt
 |     3 gamma                                        $
@@ -573,7 +573,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |
@@ -588,8 +588,8 @@
 |
 |
 == snap topbar-restored grid=100x30 cursor=7,2
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Del    /tmp/pardes-snap/tagnav/cwd New Del Filter
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/tagnav/cwd/w.txt Save New Newtt  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |     1 alpha                                        ls
 |     2 beta                                         w.txt
 |     3 gamma
@@ -604,7 +604,7 @@
 |
 |
 |
-|  /tmp/pardes-snap/tagnav/cwd     New Del Filter
+|  /tmp/pardes-snap/tagnav/cwd New Newtty Del Filte
 |  ls
 |  w.txt
 |