faster but quite buggy; no disc state storage

src/sh/keys.sh

@@ -1,37 +1,60 @@
-# Key bindings
+# See comment in `src/main.sh` on key bindings.
 #
-# Some key-bindings are used exclusively in the normal mode, others exclusively
-# in the insert mode, others in both modes.
-# Some key-bindings are universal in the sense that they do not depend on the
-# state of the player (view, mode, arguments), others are not universal.
+# Mode selection:
+# - $KEYS_I_NORMAL: Switch to normal mode (insert mode)
+# - $KEYS_N_INSERT: Switch to insert mode (normal mode)
 #
-# For fast processing, we propose the following.
-# The mode (normal or insert) is stored in the FZF_INPUT_STATE variable. All
-# key-bindings that are independent of the `view` and of the `arguments` are
-# directly processed using a `--bind` with inline transform element. Keys that
-# depend on `view` or `arguments` are processed through `$0 --fzf-key`. In a
-# future step, we may also store the `view` part of the state as hidden fields
-# in the list (the list generator makes that). Then, it may be possible to
-# completely get rid of the state files. Even beter, we may store the view part
-# in FZF_HEADER_LABEL.
+# Vertical navigation:
+# - $KEYS_DOWN: Move cursor to the next line
+# - $KEYS_UP: Move cursor to the previous line
+# - $KEYS_HALFPAGE_UP: Move cursor half a page up
+# - $KEYS_HALFPAGE_DOWN: Move cursor half a page up
+# - $KEYS_N_DOWN: Move cursor to the next line (normal mode)
+# - $KEYS_N_UP: Move cursor to the previous line (normal mode)
+# - $KEYS_N_BOT: Move cursor to the last line (normal mode)
+# - $KEYS_N_TOP: Move cursor to the first line (normal mode)
 #
-# Switching between the modes (normal <-> insert) is done using two fzf `--bind`
-# arguments. We make sure that only one is active.
+# Horizontal navigation:
+# - $KEYS_IN: Enter into selected item, down the hierarchy
+# - $KEYS_OUT: Leave current item, up the hierarchy
+#
+# Filtering:
+#
+# Playback:
+#
+# Extras:
+# - $KEYS_BROWSE: Open MusicBrainz webpage of the selected item
+# - $KEYS_OPEN: Open file manager in the directory of the selected item
+
+# Mode selection:
 KEYS_I_NORMAL="${KEYS_I_NORMAL:-"esc"}"
 KEYS_N_INSERT="${KEYS_N_INSERT:-"a,i,/"}"
 
+# Vertical navigation:
+KEYS_DOWN="${KEYS_DOWN:-"ctrl-j,down"}"
+KEYS_UP="${KEYS_UP:-"ctrl-k,up"}"
+KEYS_HALFPAGE_DOWN="${KEYS_HALFPAGE_DOWN:-"ctrl-d"}"
+KEYS_HALFPAGE_UP="${KEYS_HALFPAGE_UP:-"ctrl-u"}"
+KEYS_N_DOWN="${KEYS_N_DOWN:-"j"}"
+KEYS_N_UP="${KEYS_N_UP:-"k"}"
+KEYS_N_BOT="${KEYS_N_BOT:-"G"}"
+KEYS_N_TOP="${KEYS_N_TOP:-"1"}"
+
+# Horizontal navigation:
+KEYS_IN="${KEYS_IN:-"ctrl-l"}"
+KEYS_OUT="${KEYS_OUT:-"ctrl-h"}"
+
+## Not yet characterized
+KEYS_N_QUIT="${KEYS_N_QUIT:-"q"}"
+
 KEYS_INPUT_SINGLE='0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,!,",#,$,%,&,\,(,),*,+,,,-,.,/,:,;,<,=,>,?,@,[,\,\,],^,_,`,{,|,},~'
 KEYS_INPUT_SINGLE="$KEYS_INPUT_SINGLE,'"
 KEYS_INPUT_SPECIAL="space,backspace,delete,left,right"
 export KEYS_INPUT_SINGLE KEYS_INPUT_SPECIAL
 
 # Normal and insert mode
-KEYS_HALFPAGE_DOWN="${KEYS_HALFPAGE_DOWN:-"ctrl-d"}"
-KEYS_HALFPAGE_UP="${KEYS_HALFPAGE_UP:-"ctrl-u"}"
 KEYS_BROWSE="${KEYS_BROWSE:-"alt-b"}"
 KEYS_OPEN="${KEYS_OPEN:-"alt-o"}"
-KEYS_OUT="${KEYS_OUT:-"ctrl-h"}"
-KEYS_IN="${KEYS_IN:-"ctrl-l"}"
 KEYS_SELECT_ARTIST="${KEYS_SELECT_ARTIST:-"ctrl-a"}"
 KEYS_FILTER_LOCAL="${KEYS_FILTER_LOCAL:-"alt-l"}"
 KEYS_FILTER_1="${KEYS_FILTER_1:-"alt-1"}"
@@ -47,13 +70,8 @@ KEYS_NI="$KEYS_HALFPAGE_DOWN,$KEYS_HALFPAGE_UP,$KEYS_BROWSE,$KEYS_OPEN,$KEYS_OUT
 export KEYS_NI
 
 # Keys in normal mode only
-KEYS_N_DOWN="${KEYS_N_DOWN:-"j"}"
-KEYS_N_UP="${KEYS_N_UP:-"k"}"
 KEYS_N_OUT="${KEYS_N_OUT:-"h"}"
 KEYS_N_IN="${KEYS_N_IN:-"l"}"
-KEYS_N_TOP="${KEYS_N_TOP:-"1"}"
-KEYS_N_BOT="${KEYS_N_BOT:-"G"}"
-KEYS_N_QUIT="${KEYS_N_QUIT:-"q"}"
 KEYS_N_INSERT="${KEYS_N_INSERT:-"a,i,/"}"
 KEYS_N_TOGGLE_PLAY_PAUSE="${KEYS_N_TOGGLE_PLAY_PAUSE:-"space"}"
 KEYS_N_PLAY_NEXT="${KEYS_N_PLAY_NEXT:-"right"}"