xkeyboard-config

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// Let Space key provide No-Break Space (NBSP), Narrow No-Break Space (NNBSP),
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// Zero-Width Non-Joiner (ZWNJ), and Zero-Width Joiner (ZWJ) for the desired
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// levels.
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// --- Just Space.
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partial
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xkb_symbols "none" {
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  key <SPCE> {[  space  ], type[group1]="ONE_LEVEL" };
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};
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// --- Plus No-Break Space.
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partial
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xkb_symbols "level2" {
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  key <SPCE> {[  space,  nobreakspace  ], type[group1]="TWO_LEVEL" };
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};
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partial
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xkb_symbols "level3" {
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  key <SPCE> {[  space,  space,  nobreakspace  ], type[group1]="FOUR_LEVEL" };
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};
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// Experience has shown that users accidently type non-breaking spaces when
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// NBSP is on level 3, so having it on level 4 is the safe default nowadays.
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partial
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xkb_symbols "level4" {
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  key <SPCE> {[  space,  space,  space,  nobreakspace  ], type[group1]="FOUR_LEVEL" };
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};
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// --- Plus Narrow No-Break Space
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partial
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xkb_symbols "level3n" {
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  key <SPCE> {[  space,  space,  nobreakspace,  U202F  ], type[group1]="FOUR_LEVEL" };
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};
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// NNBSP on level 6 (needing a level5 chooser).
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partial
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xkb_symbols "level4n" {
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  key <SPCE> {[  space,  space,  space,  nobreakspace,  space,  U202F,  any,  any  ],
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                 type[group1]="EIGHT_LEVEL" };
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};
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// NNBSP on level 6 (accessed with Ctrl+Shift).
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partial
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xkb_symbols "level4nl" {
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  key <SPCE> {[  space,  space,  space,  nobreakspace,  space,  U202F,  any,  any  ],
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                 type[group1]="EIGHT_LEVEL_BY_CTRL" };
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};
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// Zero-Width Non-Joiner (ZWNJ) and Zero-Width Joiner (ZWJ) are widely used
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// in Persian, Kurdish, Pashto, Uzbek, and other languages in their area.
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// ZWNJ on level 2
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partial
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xkb_symbols "zwnj2" {
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  key <SPCE> {[  space,  U200c  ], type[group1]="TWO_LEVEL" };
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};
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// ZWNJ on level 2
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// ZWJ on level 3
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partial
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xkb_symbols "zwnj2zwj3" {
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  key <SPCE> {[  space,  U200c,  U200d  ], type[group1]="FOUR_LEVEL" };
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};
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// ZWNJ on level 2
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// ZWJ on level 3
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// NBSP on level 4
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partial
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xkb_symbols "zwnj2zwj3nb4" {
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  key <SPCE> {[  space,  U200c,  U200d,  nobreakspace  ], type[group1]="FOUR_LEVEL" };
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};
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// ZWNJ on level 2
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// NBSP on level 3
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partial
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xkb_symbols "zwnj2nb3" {
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  key <SPCE> {[  space,  U200c,  nobreakspace  ], type[group1]="FOUR_LEVEL" };
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};
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// ZWNJ on level 2
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// NBSP on level 3
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// ZWJ on level 4
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partial
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xkb_symbols "zwnj2nb3zwj4" {
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  key <SPCE> {[  space,  U200c,  nobreakspace,  U200d  ], type[group1]="FOUR_LEVEL" };
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};
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// ZWNJ on level 2
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// NBSP on level 3
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// NNBSP on level 4
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partial
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xkb_symbols "zwnj2nb3nnb4" {
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  key <SPCE> {[  space,  U200c,  nobreakspace,  U202F  ], type[group1]="FOUR_LEVEL" };
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};
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// ZWNJ on level 3
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// ZWJ on level 4
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partial
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xkb_symbols "zwnj3zwj4" {
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  key <SPCE> {[  space,  space,  U200c,  U200d  ], type[group1]="FOUR_LEVEL" };
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};
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