Add sub-word actions (#3997)

Add `backward-subword`, `forward-subword`, `kill-subword`, `backward-kill-subword` actions.

man/man1/fzf.1

@@ -1807,7 +1807,9 @@ A key or an event can be bound to one or more of the following actions.
     \fBbackward\-char\fR                \fIctrl\-b  left\fR
     \fBbackward\-delete\-char\fR         \fIctrl\-h ctrl\-bspace bspace\fR
     \fBbackward\-delete\-char/eof\fR     (same as \fBbackward\-delete\-char\fR except aborts fzf if query is empty)
+    \fBbackward\-kill\-subword\fR
     \fBbackward\-kill\-word\fR           \fIalt\-bs\fR
+    \fBbackward\-subword\fR
     \fBbackward\-word\fR                \fIalt\-b   shift\-left\fR
     \fBbecome(...)\fR                  (replace fzf process with the specified command; see below for the details)
     \fBbeginning\-of\-line\fR            \fIctrl\-a  home\fR
@@ -1847,10 +1849,12 @@ A key or an event can be bound to one or more of the following actions.
     \fBexecute\-silent(...)\fR          (see below for the details)
     \fBfirst\fR                        (move to the first match; same as \fBpos(1)\fR)
     \fBforward\-char\fR                 \fIctrl\-f  right\fR
+    \fBforward\-subword\fR
     \fBforward\-word\fR                 \fIalt\-f   shift\-right\fR
     \fBignore\fR
     \fBjump\fR                         (EasyMotion-like 2-keystroke movement)
     \fBkill\-line\fR
+    \fBkill\-subword\fR
     \fBkill\-word\fR                    \fIalt\-d\fR
     \fBlast\fR                         (move to the last match; same as \fBpos(\-1)\fR)
     \fBnext\-history\fR                 (\fIctrl\-n\fR on \fB\-\-history\fR)

src/actiontype_string.go

@@ -25,154 +25,158 @@ func _() {
 	_ = x[actBackwardDeleteChar-14]
 	_ = x[actBackwardDeleteCharEof-15]
 	_ = x[actBackwardWord-16]
-	_ = x[actCancel-17]
-	_ = x[actChangeBorderLabel-18]
-	_ = x[actChangeGhost-19]
-	_ = x[actChangeHeader-20]
-	_ = x[actChangeFooter-21]
-	_ = x[actChangeHeaderLabel-22]
-	_ = x[actChangeFooterLabel-23]
-	_ = x[actChangeInputLabel-24]
-	_ = x[actChangeListLabel-25]
-	_ = x[actChangeMulti-26]
-	_ = x[actChangeNth-27]
-	_ = x[actChangePointer-28]
-	_ = x[actChangePreview-29]
-	_ = x[actChangePreviewLabel-30]
-	_ = x[actChangePreviewWindow-31]
-	_ = x[actChangePrompt-32]
-	_ = x[actChangeQuery-33]
-	_ = x[actClearScreen-34]
-	_ = x[actClearQuery-35]
-	_ = x[actClearSelection-36]
-	_ = x[actClose-37]
-	_ = x[actDeleteChar-38]
-	_ = x[actDeleteCharEof-39]
-	_ = x[actEndOfLine-40]
-	_ = x[actFatal-41]
-	_ = x[actForwardChar-42]
-	_ = x[actForwardWord-43]
-	_ = x[actKillLine-44]
-	_ = x[actKillWord-45]
-	_ = x[actUnixLineDiscard-46]
-	_ = x[actUnixWordRubout-47]
-	_ = x[actYank-48]
-	_ = x[actBackwardKillWord-49]
-	_ = x[actSelectAll-50]
-	_ = x[actDeselectAll-51]
-	_ = x[actToggle-52]
-	_ = x[actToggleSearch-53]
-	_ = x[actToggleAll-54]
-	_ = x[actToggleDown-55]
-	_ = x[actToggleUp-56]
-	_ = x[actToggleIn-57]
-	_ = x[actToggleOut-58]
-	_ = x[actToggleTrack-59]
-	_ = x[actToggleTrackCurrent-60]
-	_ = x[actToggleHeader-61]
-	_ = x[actToggleWrap-62]
-	_ = x[actToggleMultiLine-63]
-	_ = x[actToggleHscroll-64]
-	_ = x[actTrackCurrent-65]
-	_ = x[actToggleInput-66]
-	_ = x[actHideInput-67]
-	_ = x[actShowInput-68]
-	_ = x[actUntrackCurrent-69]
-	_ = x[actDown-70]
-	_ = x[actUp-71]
-	_ = x[actPageUp-72]
-	_ = x[actPageDown-73]
-	_ = x[actPosition-74]
-	_ = x[actHalfPageUp-75]
-	_ = x[actHalfPageDown-76]
-	_ = x[actOffsetUp-77]
-	_ = x[actOffsetDown-78]
-	_ = x[actOffsetMiddle-79]
-	_ = x[actJump-80]
-	_ = x[actJumpAccept-81]
-	_ = x[actPrintQuery-82]
-	_ = x[actRefreshPreview-83]
-	_ = x[actReplaceQuery-84]
-	_ = x[actToggleSort-85]
-	_ = x[actShowPreview-86]
-	_ = x[actHidePreview-87]
-	_ = x[actTogglePreview-88]
-	_ = x[actTogglePreviewWrap-89]
-	_ = x[actTransform-90]
-	_ = x[actTransformBorderLabel-91]
-	_ = x[actTransformGhost-92]
-	_ = x[actTransformHeader-93]
-	_ = x[actTransformFooter-94]
-	_ = x[actTransformHeaderLabel-95]
-	_ = x[actTransformFooterLabel-96]
-	_ = x[actTransformInputLabel-97]
-	_ = x[actTransformListLabel-98]
-	_ = x[actTransformNth-99]
-	_ = x[actTransformPointer-100]
-	_ = x[actTransformPreviewLabel-101]
-	_ = x[actTransformPrompt-102]
-	_ = x[actTransformQuery-103]
-	_ = x[actTransformSearch-104]
-	_ = x[actTrigger-105]
-	_ = x[actBgTransform-106]
-	_ = x[actBgTransformBorderLabel-107]
-	_ = x[actBgTransformGhost-108]
-	_ = x[actBgTransformHeader-109]
-	_ = x[actBgTransformFooter-110]
-	_ = x[actBgTransformHeaderLabel-111]
-	_ = x[actBgTransformFooterLabel-112]
-	_ = x[actBgTransformInputLabel-113]
-	_ = x[actBgTransformListLabel-114]
-	_ = x[actBgTransformNth-115]
-	_ = x[actBgTransformPointer-116]
-	_ = x[actBgTransformPreviewLabel-117]
-	_ = x[actBgTransformPrompt-118]
-	_ = x[actBgTransformQuery-119]
-	_ = x[actBgTransformSearch-120]
-	_ = x[actBgCancel-121]
-	_ = x[actSearch-122]
-	_ = x[actPreview-123]
-	_ = x[actPreviewTop-124]
-	_ = x[actPreviewBottom-125]
-	_ = x[actPreviewUp-126]
-	_ = x[actPreviewDown-127]
-	_ = x[actPreviewPageUp-128]
-	_ = x[actPreviewPageDown-129]
-	_ = x[actPreviewHalfPageUp-130]
-	_ = x[actPreviewHalfPageDown-131]
-	_ = x[actPrevHistory-132]
-	_ = x[actPrevSelected-133]
-	_ = x[actPrint-134]
-	_ = x[actPut-135]
-	_ = x[actNextHistory-136]
-	_ = x[actNextSelected-137]
-	_ = x[actExecute-138]
-	_ = x[actExecuteSilent-139]
-	_ = x[actExecuteMulti-140]
-	_ = x[actSigStop-141]
-	_ = x[actFirst-142]
-	_ = x[actLast-143]
-	_ = x[actReload-144]
-	_ = x[actReloadSync-145]
-	_ = x[actDisableSearch-146]
-	_ = x[actEnableSearch-147]
-	_ = x[actSelect-148]
-	_ = x[actDeselect-149]
-	_ = x[actUnbind-150]
-	_ = x[actRebind-151]
-	_ = x[actToggleBind-152]
-	_ = x[actBecome-153]
-	_ = x[actShowHeader-154]
-	_ = x[actHideHeader-155]
-	_ = x[actBell-156]
-	_ = x[actExclude-157]
-	_ = x[actExcludeMulti-158]
-	_ = x[actAsync-159]
+	_ = x[actBackwardSubWord-17]
+	_ = x[actCancel-18]
+	_ = x[actChangeBorderLabel-19]
+	_ = x[actChangeGhost-20]
+	_ = x[actChangeHeader-21]
+	_ = x[actChangeFooter-22]
+	_ = x[actChangeHeaderLabel-23]
+	_ = x[actChangeFooterLabel-24]
+	_ = x[actChangeInputLabel-25]
+	_ = x[actChangeListLabel-26]
+	_ = x[actChangeMulti-27]
+	_ = x[actChangeNth-28]
+	_ = x[actChangePointer-29]
+	_ = x[actChangePreview-30]
+	_ = x[actChangePreviewLabel-31]
+	_ = x[actChangePreviewWindow-32]
+	_ = x[actChangePrompt-33]
+	_ = x[actChangeQuery-34]
+	_ = x[actClearScreen-35]
+	_ = x[actClearQuery-36]
+	_ = x[actClearSelection-37]
+	_ = x[actClose-38]
+	_ = x[actDeleteChar-39]
+	_ = x[actDeleteCharEof-40]
+	_ = x[actEndOfLine-41]
+	_ = x[actFatal-42]
+	_ = x[actForwardChar-43]
+	_ = x[actForwardWord-44]
+	_ = x[actForwardSubWord-45]
+	_ = x[actKillLine-46]
+	_ = x[actKillWord-47]
+	_ = x[actKillSubWord-48]
+	_ = x[actUnixLineDiscard-49]
+	_ = x[actUnixWordRubout-50]
+	_ = x[actYank-51]
+	_ = x[actBackwardKillWord-52]
+	_ = x[actBackwardKillSubWord-53]
+	_ = x[actSelectAll-54]
+	_ = x[actDeselectAll-55]
+	_ = x[actToggle-56]
+	_ = x[actToggleSearch-57]
+	_ = x[actToggleAll-58]
+	_ = x[actToggleDown-59]
+	_ = x[actToggleUp-60]
+	_ = x[actToggleIn-61]
+	_ = x[actToggleOut-62]
+	_ = x[actToggleTrack-63]
+	_ = x[actToggleTrackCurrent-64]
+	_ = x[actToggleHeader-65]
+	_ = x[actToggleWrap-66]
+	_ = x[actToggleMultiLine-67]
+	_ = x[actToggleHscroll-68]
+	_ = x[actTrackCurrent-69]
+	_ = x[actToggleInput-70]
+	_ = x[actHideInput-71]
+	_ = x[actShowInput-72]
+	_ = x[actUntrackCurrent-73]
+	_ = x[actDown-74]
+	_ = x[actUp-75]
+	_ = x[actPageUp-76]
+	_ = x[actPageDown-77]
+	_ = x[actPosition-78]
+	_ = x[actHalfPageUp-79]
+	_ = x[actHalfPageDown-80]
+	_ = x[actOffsetUp-81]
+	_ = x[actOffsetDown-82]
+	_ = x[actOffsetMiddle-83]
+	_ = x[actJump-84]
+	_ = x[actJumpAccept-85]
+	_ = x[actPrintQuery-86]
+	_ = x[actRefreshPreview-87]
+	_ = x[actReplaceQuery-88]
+	_ = x[actToggleSort-89]
+	_ = x[actShowPreview-90]
+	_ = x[actHidePreview-91]
+	_ = x[actTogglePreview-92]
+	_ = x[actTogglePreviewWrap-93]
+	_ = x[actTransform-94]
+	_ = x[actTransformBorderLabel-95]
+	_ = x[actTransformGhost-96]
+	_ = x[actTransformHeader-97]
+	_ = x[actTransformFooter-98]
+	_ = x[actTransformHeaderLabel-99]
+	_ = x[actTransformFooterLabel-100]
+	_ = x[actTransformInputLabel-101]
+	_ = x[actTransformListLabel-102]
+	_ = x[actTransformNth-103]
+	_ = x[actTransformPointer-104]
+	_ = x[actTransformPreviewLabel-105]
+	_ = x[actTransformPrompt-106]
+	_ = x[actTransformQuery-107]
+	_ = x[actTransformSearch-108]
+	_ = x[actTrigger-109]
+	_ = x[actBgTransform-110]
+	_ = x[actBgTransformBorderLabel-111]
+	_ = x[actBgTransformGhost-112]
+	_ = x[actBgTransformHeader-113]
+	_ = x[actBgTransformFooter-114]
+	_ = x[actBgTransformHeaderLabel-115]
+	_ = x[actBgTransformFooterLabel-116]
+	_ = x[actBgTransformInputLabel-117]
+	_ = x[actBgTransformListLabel-118]
+	_ = x[actBgTransformNth-119]
+	_ = x[actBgTransformPointer-120]
+	_ = x[actBgTransformPreviewLabel-121]
+	_ = x[actBgTransformPrompt-122]
+	_ = x[actBgTransformQuery-123]
+	_ = x[actBgTransformSearch-124]
+	_ = x[actBgCancel-125]
+	_ = x[actSearch-126]
+	_ = x[actPreview-127]
+	_ = x[actPreviewTop-128]
+	_ = x[actPreviewBottom-129]
+	_ = x[actPreviewUp-130]
+	_ = x[actPreviewDown-131]
+	_ = x[actPreviewPageUp-132]
+	_ = x[actPreviewPageDown-133]
+	_ = x[actPreviewHalfPageUp-134]
+	_ = x[actPreviewHalfPageDown-135]
+	_ = x[actPrevHistory-136]
+	_ = x[actPrevSelected-137]
+	_ = x[actPrint-138]
+	_ = x[actPut-139]
+	_ = x[actNextHistory-140]
+	_ = x[actNextSelected-141]
+	_ = x[actExecute-142]
+	_ = x[actExecuteSilent-143]
+	_ = x[actExecuteMulti-144]
+	_ = x[actSigStop-145]
+	_ = x[actFirst-146]
+	_ = x[actLast-147]
+	_ = x[actReload-148]
+	_ = x[actReloadSync-149]
+	_ = x[actDisableSearch-150]
+	_ = x[actEnableSearch-151]
+	_ = x[actSelect-152]
+	_ = x[actDeselect-153]
+	_ = x[actUnbind-154]
+	_ = x[actRebind-155]
+	_ = x[actToggleBind-156]
+	_ = x[actBecome-157]
+	_ = x[actShowHeader-158]
+	_ = x[actHideHeader-159]
+	_ = x[actBell-160]
+	_ = x[actExclude-161]
+	_ = x[actExcludeMulti-162]
+	_ = x[actAsync-163]
 }
 
-const _actionType_name = "actIgnoreactStartactClickactInvalidactBracketedPasteBeginactBracketedPasteEndactCharactMouseactBeginningOfLineactAbortactAcceptactAcceptNonEmptyactAcceptOrPrintQueryactBackwardCharactBackwardDeleteCharactBackwardDeleteCharEofactBackwardWordactCancelactChangeBorderLabelactChangeGhostactChangeHeaderactChangeFooteractChangeHeaderLabelactChangeFooterLabelactChangeInputLabelactChangeListLabelactChangeMultiactChangeNthactChangePointeractChangePreviewactChangePreviewLabelactChangePreviewWindowactChangePromptactChangeQueryactClearScreenactClearQueryactClearSelectionactCloseactDeleteCharactDeleteCharEofactEndOfLineactFatalactForwardCharactForwardWordactKillLineactKillWordactUnixLineDiscardactUnixWordRuboutactYankactBackwardKillWordactSelectAllactDeselectAllactToggleactToggleSearchactToggleAllactToggleDownactToggleUpactToggleInactToggleOutactToggleTrackactToggleTrackCurrentactToggleHeaderactToggleWrapactToggleMultiLineactToggleHscrollactTrackCurrentactToggleInputactHideInputactShowInputactUntrackCurrentactDownactUpactPageUpactPageDownactPositionactHalfPageUpactHalfPageDownactOffsetUpactOffsetDownactOffsetMiddleactJumpactJumpAcceptactPrintQueryactRefreshPreviewactReplaceQueryactToggleSortactShowPreviewactHidePreviewactTogglePreviewactTogglePreviewWrapactTransformactTransformBorderLabelactTransformGhostactTransformHeaderactTransformFooteractTransformHeaderLabelactTransformFooterLabelactTransformInputLabelactTransformListLabelactTransformNthactTransformPointeractTransformPreviewLabelactTransformPromptactTransformQueryactTransformSearchactTriggeractBgTransformactBgTransformBorderLabelactBgTransformGhostactBgTransformHeaderactBgTransformFooteractBgTransformHeaderLabelactBgTransformFooterLabelactBgTransformInputLabelactBgTransformListLabelactBgTransformNthactBgTransformPointeractBgTransformPreviewLabelactBgTransformPromptactBgTransformQueryactBgTransformSearchactBgCancelactSearchactPreviewactPreviewTopactPreviewBottomactPreviewUpactPreviewDownactPreviewPageUpactPreviewPageDownactPreviewHalfPageUpactPreviewHalfPageDownactPrevHistoryactPrevSelectedactPrintactPutactNextHistoryactNextSelectedactExecuteactExecuteSilentactExecuteMultiactSigStopactFirstactLastactReloadactReloadSyncactDisableSearchactEnableSearchactSelectactDeselectactUnbindactRebindactToggleBindactBecomeactShowHeaderactHideHeaderactBellactExcludeactExcludeMultiactAsync"
+const _actionType_name = "actIgnoreactStartactClickactInvalidactBracketedPasteBeginactBracketedPasteEndactCharactMouseactBeginningOfLineactAbortactAcceptactAcceptNonEmptyactAcceptOrPrintQueryactBackwardCharactBackwardDeleteCharactBackwardDeleteCharEofactBackwardWordactBackwardSubWordactCancelactChangeBorderLabelactChangeGhostactChangeHeaderactChangeFooteractChangeHeaderLabelactChangeFooterLabelactChangeInputLabelactChangeListLabelactChangeMultiactChangeNthactChangePointeractChangePreviewactChangePreviewLabelactChangePreviewWindowactChangePromptactChangeQueryactClearScreenactClearQueryactClearSelectionactCloseactDeleteCharactDeleteCharEofactEndOfLineactFatalactForwardCharactForwardWordactForwardSubWordactKillLineactKillWordactKillSubWordactUnixLineDiscardactUnixWordRuboutactYankactBackwardKillWordactBackwardKillSubWordactSelectAllactDeselectAllactToggleactToggleSearchactToggleAllactToggleDownactToggleUpactToggleInactToggleOutactToggleTrackactToggleTrackCurrentactToggleHeaderactToggleWrapactToggleMultiLineactToggleHscrollactTrackCurrentactToggleInputactHideInputactShowInputactUntrackCurrentactDownactUpactPageUpactPageDownactPositionactHalfPageUpactHalfPageDownactOffsetUpactOffsetDownactOffsetMiddleactJumpactJumpAcceptactPrintQueryactRefreshPreviewactReplaceQueryactToggleSortactShowPreviewactHidePreviewactTogglePreviewactTogglePreviewWrapactTransformactTransformBorderLabelactTransformGhostactTransformHeaderactTransformFooteractTransformHeaderLabelactTransformFooterLabelactTransformInputLabelactTransformListLabelactTransformNthactTransformPointeractTransformPreviewLabelactTransformPromptactTransformQueryactTransformSearchactTriggeractBgTransformactBgTransformBorderLabelactBgTransformGhostactBgTransformHeaderactBgTransformFooteractBgTransformHeaderLabelactBgTransformFooterLabelactBgTransformInputLabelactBgTransformListLabelactBgTransformNthactBgTransformPointeractBgTransformPreviewLabelactBgTransformPromptactBgTransformQueryactBgTransformSearchactBgCancelactSearchactPreviewactPreviewTopactPreviewBottomactPreviewUpactPreviewDownactPreviewPageUpactPreviewPageDownactPreviewHalfPageUpactPreviewHalfPageDownactPrevHistoryactPrevSelectedactPrintactPutactNextHistoryactNextSelectedactExecuteactExecuteSilentactExecuteMultiactSigStopactFirstactLastactReloadactReloadSyncactDisableSearchactEnableSearchactSelectactDeselectactUnbindactRebindactToggleBindactBecomeactShowHeaderactHideHeaderactBellactExcludeactExcludeMultiactAsync"
 
-var _actionType_index = [...]uint16{0, 9, 17, 25, 35, 57, 77, 84, 92, 110, 118, 127, 144, 165, 180, 201, 225, 240, 249, 269, 283, 298, 313, 333, 353, 372, 390, 404, 416, 432, 448, 469, 491, 506, 520, 534, 547, 564, 572, 585, 601, 613, 621, 635, 649, 660, 671, 689, 706, 713, 732, 744, 758, 767, 782, 794, 807, 818, 829, 841, 855, 876, 891, 904, 922, 938, 953, 967, 979, 991, 1008, 1015, 1020, 1029, 1040, 1051, 1064, 1079, 1090, 1103, 1118, 1125, 1138, 1151, 1168, 1183, 1196, 1210, 1224, 1240, 1260, 1272, 1295, 1312, 1330, 1348, 1371, 1394, 1416, 1437, 1452, 1471, 1495, 1513, 1530, 1548, 1558, 1572, 1597, 1616, 1636, 1656, 1681, 1706, 1730, 1753, 1770, 1791, 1817, 1837, 1856, 1876, 1887, 1896, 1906, 1919, 1935, 1947, 1961, 1977, 1995, 2015, 2037, 2051, 2066, 2074, 2080, 2094, 2109, 2119, 2135, 2150, 2160, 2168, 2175, 2184, 2197, 2213, 2228, 2237, 2248, 2257, 2266, 2279, 2288, 2301, 2314, 2321, 2331, 2346, 2354}
+var _actionType_index = [...]uint16{0, 9, 17, 25, 35, 57, 77, 84, 92, 110, 118, 127, 144, 165, 180, 201, 225, 240, 258, 267, 287, 301, 316, 331, 351, 371, 390, 408, 422, 434, 450, 466, 487, 509, 524, 538, 552, 565, 582, 590, 603, 619, 631, 639, 653, 667, 684, 695, 706, 720, 738, 755, 762, 781, 803, 815, 829, 838, 853, 865, 878, 889, 900, 912, 926, 947, 962, 975, 993, 1009, 1024, 1038, 1050, 1062, 1079, 1086, 1091, 1100, 1111, 1122, 1135, 1150, 1161, 1174, 1189, 1196, 1209, 1222, 1239, 1254, 1267, 1281, 1295, 1311, 1331, 1343, 1366, 1383, 1401, 1419, 1442, 1465, 1487, 1508, 1523, 1542, 1566, 1584, 1601, 1619, 1629, 1643, 1668, 1687, 1707, 1727, 1752, 1777, 1801, 1824, 1841, 1862, 1888, 1908, 1927, 1947, 1958, 1967, 1977, 1990, 2006, 2018, 2032, 2048, 2066, 2086, 2108, 2122, 2137, 2145, 2151, 2165, 2180, 2190, 2206, 2221, 2231, 2239, 2246, 2255, 2268, 2284, 2299, 2308, 2319, 2328, 2337, 2350, 2359, 2372, 2385, 2392, 2402, 2417, 2425}
 
 func (i actionType) String() string {
 	if i < 0 || i >= actionType(len(_actionType_index)-1) {

src/options.go

@@ -1663,6 +1663,8 @@ func parseActionList(masked string, original string, prevActions []*action, putA
 			appendAction(actBackwardDeleteCharEof)
 		case "backward-word":
 			appendAction(actBackwardWord)
+		case "backward-subword":
+			appendAction(actBackwardSubWord)
 		case "clear-screen":
 			appendAction(actClearScreen)
 		case "delete-char":
@@ -1683,6 +1685,8 @@ func parseActionList(masked string, original string, prevActions []*action, putA
 			appendAction(actForwardChar)
 		case "forward-word":
 			appendAction(actForwardWord)
+		case "forward-subword":
+			appendAction(actForwardSubWord)
 		case "jump":
 			appendAction(actJump)
 		case "jump-accept":
@@ -1691,6 +1695,8 @@ func parseActionList(masked string, original string, prevActions []*action, putA
 			appendAction(actKillLine)
 		case "kill-word":
 			appendAction(actKillWord)
+		case "kill-subword":
+			appendAction(actKillSubWord)
 		case "unix-line-discard", "line-discard":
 			appendAction(actUnixLineDiscard)
 		case "unix-word-rubout", "word-rubout":
@@ -1699,6 +1705,8 @@ func parseActionList(masked string, original string, prevActions []*action, putA
 			appendAction(actYank)
 		case "backward-kill-word":
 			appendAction(actBackwardKillWord)
+		case "backward-kill-subword":
+			appendAction(actBackwardKillSubWord)
 		case "toggle-down":
 			appendAction(actToggle, actDown)
 		case "toggle-up":

src/terminal.go

@@ -291,6 +291,8 @@ type Terminal struct {
 	gapLineLen         int
 	wordRubout         string
 	wordNext           string
+	subWordRubout      string
+	subWordNext        string
 	cx                 int
 	cy                 int
 	offset             int
@@ -512,6 +514,7 @@ const (
 	actBackwardDeleteChar
 	actBackwardDeleteCharEof
 	actBackwardWord
+	actBackwardSubWord
 	actCancel
 
 	actChangeBorderLabel
@@ -541,12 +544,15 @@ const (
 	actFatal
 	actForwardChar
 	actForwardWord
+	actForwardSubWord
 	actKillLine
 	actKillWord
+	actKillSubWord
 	actUnixLineDiscard
 	actUnixWordRubout
 	actYank
 	actBackwardKillWord
+	actBackwardKillSubWord
 	actSelectAll
 	actDeselectAll
 	actToggle
@@ -937,6 +943,8 @@ func NewTerminal(opts *Options, eventBox *util.EventBox, executor *util.Executor
 	}
 	wordRubout := "[^\\pL\\pN][\\pL\\pN]"
 	wordNext := "[\\pL\\pN][^\\pL\\pN]|(.$)"
+	subWordRubout := "[a-z][A-Z]|[^\\pL\\pN][\\pL\\pN]"
+	subWordNext := "[a-z][A-Z]|[\\pL\\pN][^\\pL\\pN]|(.$)"
 	if opts.FileWord {
 		sep := regexp.QuoteMeta(string(os.PathSeparator))
 		wordRubout = fmt.Sprintf("%s[^%s]", sep, sep)
@@ -970,6 +978,8 @@ func NewTerminal(opts *Options, eventBox *util.EventBox, executor *util.Executor
 		markerMultiLine:    *opts.MarkerMulti,
 		wordRubout:         wordRubout,
 		wordNext:           wordNext,
+		subWordRubout:      subWordRubout,
+		subWordNext:        subWordNext,
 		cx:                 len(input),
 		cy:                 0,
 		offset:             0,
@@ -6021,6 +6031,11 @@ func (t *Terminal) Loop() error {
 				if t.cx > 0 {
 					t.rubout(t.wordRubout)
 				}
+			case actBackwardKillSubWord:
+				beof = len(t.input) == 0
+				if t.cx > 0 {
+					t.rubout(t.subWordRubout)
+				}
 			case actYank:
 				suffix := copySlice(t.input[t.cx:])
 				t.input = append(append(t.input[:t.cx], t.yanked...), suffix...)
@@ -6132,6 +6147,10 @@ func (t *Terminal) Loop() error {
 				t.cx = findLastMatch(t.wordRubout, string(t.input[:t.cx])) + 1
 			case actForwardWord:
 				t.cx += findFirstMatch(t.wordNext, string(t.input[t.cx:])) + 1
+			case actBackwardSubWord:
+				t.cx = findLastMatch(t.subWordRubout, string(t.input[:t.cx])) + 1
+			case actForwardSubWord:
+				t.cx += findFirstMatch(t.subWordNext, string(t.input[t.cx:])) + 1
 			case actKillWord:
 				ncx := t.cx +
 					findFirstMatch(t.wordNext, string(t.input[t.cx:])) + 1
@@ -6139,6 +6158,13 @@ func (t *Terminal) Loop() error {
 					t.yanked = copySlice(t.input[t.cx:ncx])
 					t.input = append(t.input[:t.cx], t.input[ncx:]...)
 				}
+			case actKillSubWord:
+				ncx := t.cx +
+					findFirstMatch(t.subWordNext, string(t.input[t.cx:])) + 1
+				if ncx > t.cx {
+					t.yanked = copySlice(t.input[t.cx:ncx])
+					t.input = append(t.input[:t.cx], t.input[ncx:]...)
+				}
 			case actKillLine:
 				if t.cx < len(t.input) {
 					t.yanked = copySlice(t.input[t.cx:])

test/test_core.rb

@@ -108,6 +108,40 @@ class TestCore < TestInteractive
     assert_equal %w[3 2 5 6 8 7], fzf_output_lines
   end
 
+  def test_subword_forward
+    tmux.send_keys "#{FZF} --bind K:kill-subword,F:forward-subword -q 'foo bar foo-bar fooFooBar'", :Enter, :Home
+    tmux.until { |lines| assert_equal '> foo bar foo-bar fooFooBar', lines.last }
+
+    tmux.send_keys 'F', :Delete
+    tmux.until { |lines| assert_equal '> foobar foo-bar fooFooBar', lines.last }
+
+    tmux.send_keys 'K'
+    tmux.until { |lines| assert_equal '> foo foo-bar fooFooBar', lines.last }
+
+    tmux.send_keys 'F', 'K'
+    tmux.until { |lines| assert_equal '> foo foo fooFooBar', lines.last }
+
+    tmux.send_keys 'F', 'F', 'K'
+    tmux.until { |lines| assert_equal '> foo foo fooFoo', lines.last }
+  end
+
+  def test_subword_backward
+    tmux.send_keys "#{FZF} --bind K:backward-kill-subword,B:backward-subword -q 'foo bar foo-bar fooBar'", :Enter
+    tmux.until { |lines| assert_equal '> foo bar foo-bar fooBar', lines.last }
+
+    tmux.send_keys 'B', :BSpace
+    tmux.until { |lines| assert_equal '> foo bar foo-bar foBar', lines.last }
+
+    tmux.send_keys 'K'
+    tmux.until { |lines| assert_equal '> foo bar foo-bar Bar', lines.last }
+
+    tmux.send_keys 'B', :BSpace
+    tmux.until { |lines| assert_equal '> foo bar foobar Bar', lines.last }
+
+    tmux.send_keys 'B', 'B', :BSpace
+    tmux.until { |lines| assert_equal '> foobar foobar Bar', lines.last }
+  end
+
   def test_multi_max
     tmux.send_keys "seq 1 10 | #{FZF} -m 3 --bind A:select-all,T:toggle-all --preview 'echo [{+}]/{}'", :Enter