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

1 files changed, 132 insertions, 96 deletions

diff --git a/test/snapshots/builtins.golden b/test/snapshots/builtins.golden
index 13ed8313..96cc9696 100644
--- a/test/snapshots/builtins.golden
+++ b/test/snapshots/builtins.golden
@@ -1,6 +1,6 @@
-== snap boot grid=120x60 cursor=7,2
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/builtins/cwd/notes.txt                                               Save New Del
+== snap boot grid=120x66 cursor=7,2
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/builtins/cwd/notes.txt                                        Save New Newtty Del
 |     1 line 1
 |     2 line 2
 |     3 line 3
@@ -59,9 +59,15 @@
 |
 |
 |
-== snap index grid=120x60 cursor=7,32
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/builtins/cwd/notes.txt                                               Save New Del
+|
+|
+|
+|
+|
+|
+== snap index grid=120x66 cursor=7,35
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/builtins/cwd/notes.txt                                        Save New Newtty Del
 |     1 line 1
 |     2 line 2
 |     3 line 3
@@ -91,7 +97,10 @@
 |
 |
 |
-|  /tmp/pardes-snap/builtins/cwd/+Help                                                        New Del
+|
+|
+|
+|  /tmp/pardes-snap/builtins/cwd/+Help                                                 New Newtty Del
 |     1 pardes builtins, and how to run each:
 |     2 SPC and its keys, a chord, a button, the
 |     3 topbar - or the name, executed anywhere.
@@ -112,17 +121,20 @@
 |    18 SPC a w   PanelWave
 |    19 SPC a z   PanelZoom
 |    20 SPC c d   Delcol
-|    21 SPC c n   Newcol            topbar
-|    22 SPC d     Del
-|    23 SPC f c   Config
-|    24 SPC f f   Find              topbar
-|    25 SPC f g   Grep              topbar
-|    26 SPC f n   New               topbar
-|    27 SPC f s   Save
-|    28 SPC h t   Tutor             topbar
-== snap index-tail grid=120x60 cursor=7,58
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/builtins/cwd/notes.txt                                               Save New Del
+|    21 SPC c j   Joincol           topbar
+|    22 SPC c n   Newcol            topbar
+|    23 SPC d     Del
+|    24 SPC f c   Config
+|    25 SPC f f   Find              topbar
+|    26 SPC f g   Grep              topbar
+|    27 SPC f n   New               topbar
+|    28 SPC f s   Save
+|    29 SPC h c   Changelog         topbar
+|    30 SPC h t   Tutor             topbar
+|    31 SPC j i   Forward           C-i
+== snap index-tail grid=120x66 cursor=7,64
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/builtins/cwd/notes.txt                                        Save New Newtty Del
 |     1 line 1
 |     2 line 2
 |     3 line 3
@@ -152,38 +164,44 @@
 |
 |
 |
-|  /tmp/pardes-snap/builtins/cwd/+Help                                                        New Del
-|    46 SPC s r   Restore
-|    47 SPC t a   Ascii
-|    48 SPC t b   Tagbottom
-|    49 SPC t c   Colors
-|    50 SPC t d   Debug             topbar
-|    51 SPC t i   PdfTint
-|    52 SPC t l   Palette
-|    53 SPC t n   NextColor         topbar
-|    54 SPC t p   Petscii
-|    55 SPC t s   PdfSections
-|    56 SPC t t   ThemeSel
-|    57 SPC t w   Wrap
-|    58 SPC t z   PdfFit
-|    59 SPC w h   Left              C-w h, C-w left
-|    60 SPC w j   Down              C-w j, C-w down
-|    61 SPC w k   Up                C-w k, C-w up
-|    62 SPC w l   Right             C-w l, C-w right
-|    63 SPC y     ClipYank
-|    64           Look              enter, right-click
-|    65           Exec              tab, middle-click
-|    66           Msg
-|    67           ThemeFile
-|    68           DumpThemes
-|    69           Filter
-|    70           EffectCode
-|    71           Theme
-|    72           Shell
-|    73
-== snap not-a-picker grid=120x60 cursor=7,58
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/builtins/cwd/notes.txt                                               Save New Del
+|
+|
+|
+|  /tmp/pardes-snap/builtins/cwd/+Help                                                 New Newtty Del
+|    46 SPC n t   Newtty
+|    47 SPC p     ClipPaste
+|    48 SPC s d   Dump              topbar
+|    49 SPC s r   Restore
+|    50 SPC t a   Ascii
+|    51 SPC t b   Tagbottom
+|    52 SPC t c   Colors
+|    53 SPC t d   Debug             topbar
+|    54 SPC t i   PdfTint
+|    55 SPC t l   Palette
+|    56 SPC t n   NextColor         topbar
+|    57 SPC t p   Petscii
+|    58 SPC t s   PdfSections
+|    59 SPC t t   ThemeSel
+|    60 SPC t w   Wrap
+|    61 SPC t z   PdfFit
+|    62 SPC w h   Left              C-w h, C-w left
+|    63 SPC w j   Down              C-w j, C-w down
+|    64 SPC w k   Up                C-w k, C-w up
+|    65 SPC w l   Right             C-w l, C-w right
+|    66 SPC y     ClipYank
+|    67           Look              enter, right-click
+|    68           Exec              tab, middle-click
+|    69           Msg
+|    70           ThemeFile
+|    71           DumpThemes
+|    72           Filter
+|    73           EffectCode
+|    74           Theme
+|    75           Shell
+|    76
+== snap not-a-picker grid=120x66 cursor=7,64
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/builtins/cwd/notes.txt                                        Save New Newtty Del
 |     1 line 1
 |     2 line 2
 |     3 line 3
@@ -213,38 +231,44 @@
 |
 |
 |
-|  /tmp/pardes-snap/builtins/cwd/+Help                                                        New Del
-|    46 SPC s r   Restore
-|    47 SPC t a   Ascii
-|    48 SPC t b   Tagbottom
-|    49 SPC t c   Colors
-|    50 SPC t d   Debug             topbar
-|    51 SPC t i   PdfTint
-|    52 SPC t l   Palette
-|    53 SPC t n   NextColor         topbar
-|    54 SPC t p   Petscii
-|    55 SPC t s   PdfSections
-|    56 SPC t t   ThemeSel
-|    57 SPC t w   Wrap
-|    58 SPC t z   PdfFit
-|    59 SPC w h   Left              C-w h, C-w left
-|    60 SPC w j   Down              C-w j, C-w down
-|    61 SPC w k   Up                C-w k, C-w up
-|    62 SPC w l   Right             C-w l, C-w right
-|    63 SPC y     ClipYank
-|    64           Look              enter, right-click
-|    65           Exec              tab, middle-click
-|    66           Msg
-|    67           ThemeFile
-|    68           DumpThemes
-|    69           Filter
-|    70           EffectCode
-|    71           Theme
-|    72           Shell
-|    73
-== snap window-group grid=120x60 cursor=7,32
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/builtins/cwd/notes.txt                                               Save New Del
+|
+|
+|
+|  /tmp/pardes-snap/builtins/cwd/+Help                                                 New Newtty Del
+|    46 SPC n t   Newtty
+|    47 SPC p     ClipPaste
+|    48 SPC s d   Dump              topbar
+|    49 SPC s r   Restore
+|    50 SPC t a   Ascii
+|    51 SPC t b   Tagbottom
+|    52 SPC t c   Colors
+|    53 SPC t d   Debug             topbar
+|    54 SPC t i   PdfTint
+|    55 SPC t l   Palette
+|    56 SPC t n   NextColor         topbar
+|    57 SPC t p   Petscii
+|    58 SPC t s   PdfSections
+|    59 SPC t t   ThemeSel
+|    60 SPC t w   Wrap
+|    61 SPC t z   PdfFit
+|    62 SPC w h   Left              C-w h, C-w left
+|    63 SPC w j   Down              C-w j, C-w down
+|    64 SPC w k   Up                C-w k, C-w up
+|    65 SPC w l   Right             C-w l, C-w right
+|    66 SPC y     ClipYank
+|    67           Look              enter, right-click
+|    68           Exec              tab, middle-click
+|    69           Msg
+|    70           ThemeFile
+|    71           DumpThemes
+|    72           Filter
+|    73           EffectCode
+|    74           Theme
+|    75           Shell
+|    76
+== snap window-group grid=120x66 cursor=7,35
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/builtins/cwd/notes.txt                                        Save New Newtty Del
 |     1 line 1
 |     2 line 2
 |     3 line 3
@@ -274,7 +298,10 @@
 |
 |
 |
-|  /tmp/pardes-snap/builtins/cwd/+Help                                                        New Del
+|
+|
+|
+|  /tmp/pardes-snap/builtins/cwd/+Help                                                 New Newtty Del
 |     1 pardes builtins under SPC w
 |     2
 |     3 SPC w h   Left              C-w h, C-w left
@@ -303,9 +330,12 @@
 |
 |
 |
-== snap tutor-from-index grid=120x60 cursor=7,17
-|New Newcol Find Grep Help Tutor Dump NextColor Debug Kill
-|  /tmp/pardes-snap/builtins/cwd/notes.txt                                               Save New Del
+|
+|
+|
+== snap tutor-from-index grid=120x66 cursor=7,19
+|New Newcol Joincol Find Grep Help Changelog Tutor Dump NextColor Debug Kill
+|  /tmp/pardes-snap/builtins/cwd/notes.txt                                        Save New Newtty Del
 |     1 line 1
 |     2 line 2
 |     3 line 3
@@ -320,7 +350,9 @@
 |
 |
 |
-|  /Tutor                                                                                Save New Del
+|
+|
+|  /Tutor                                                                         Save New Newtty Del
 |     1
 |     2                                PARDES TUTOR
 |     3                      tmux + vi + acme, from scratch.
@@ -335,7 +367,8 @@
 |    12 =================================================================
 |    13
 |    14  Pardes is tmux + vi + acme, made from scratch. The foundation is
-|  /tmp/pardes-snap/builtins/cwd/+Help                                                        New Del
+|    15  the acme model: a pane is just text on screen. There is no separate
+|  /tmp/pardes-snap/builtins/cwd/+Help                                                 New Newtty Del
 |     1 pardes builtins, and how to run each:
 |     2 SPC and its keys, a chord, a button, the
 |     3 topbar - or the name, executed anywhere.
@@ -356,11 +389,14 @@
 |    18 SPC a w   PanelWave
 |    19 SPC a z   PanelZoom
 |    20 SPC c d   Delcol
-|    21 SPC c n   Newcol            topbar
-|    22 SPC d     Del
-|    23 SPC f c   Config
-|    24 SPC f f   Find              topbar
-|    25 SPC f g   Grep              topbar
-|    26 SPC f n   New               topbar
-|    27 SPC f s   Save
-|    28 SPC h t   Tutor             topbar
+|    21 SPC c j   Joincol           topbar
+|    22 SPC c n   Newcol            topbar
+|    23 SPC d     Del
+|    24 SPC f c   Config
+|    25 SPC f f   Find              topbar
+|    26 SPC f g   Grep              topbar
+|    27 SPC f n   New               topbar
+|    28 SPC f s   Save
+|    29 SPC h c   Changelog         topbar
+|    30 SPC h t   Tutor             topbar
+|    31 SPC j i   Forward           C-i