Implement new line editing "library"

Losing tab complete and text macros, for now.

This new implementation works on an instance of a struct and does
not interact with the rest of catgirl, making it possible to copy
into another project. Unlike existing line editing libraries, this
one is entirely abstract and can be rendered externally.

My goal with this library is to be able to implement vi mode. Since
it operates on struct instances rather than globals, it might also
be possible to give catgirl separate line editing buffers for each
window, which would be a nice UX improvement.

1 files changed, 46 insertions, 42 deletions

diff --git a/ui.c b/ui.c
index 3df0cd6..212d205 100644
--- a/ui.c
+++ b/ui.c
@@ -54,6 +54,7 @@
 #endif
 
 #include "chat.h"
+#include "edit.h"
 
 // Annoying stuff from <term.h>:
 #undef lines
@@ -752,9 +753,10 @@ static char *inputStop(
 	return stop;
 }
 
+static struct Edit edit;
+
 static void inputUpdate(void) {
-	size_t pos;
-	char *buf = editBuffer(&pos);
+	char *buf = editString(&edit);
 	struct Window *window = windows.ptrs[windows.show];
 
 	const char *prefix = "";
@@ -786,7 +788,7 @@ static void inputUpdate(void) {
 	} else {
 		prompt = "";
 	}
-	if (skip > &buf[pos]) {
+	if (skip > &buf[edit.mbs.pos]) {
 		prefix = prompt = suffix = "";
 		skip = buf;
 	}
@@ -803,10 +805,10 @@ static void inputUpdate(void) {
 	waddstr(input, suffix);
 	getyx(input, y, x);
 
-	int posx;
+	int pos;
 	struct Style style = styleInput;
-	inputStop(styleInput, &style, skip, &buf[pos]);
-	getyx(input, y, posx);
+	inputStop(styleInput, &style, skip, &buf[edit.mbs.pos]);
+	getyx(input, y, pos);
 	wmove(input, y, x);
 
 	style = styleInput;
@@ -818,7 +820,7 @@ static void inputUpdate(void) {
 	}
 	inputAdd(styleInput, &style, ptr);
 	wclrtoeol(input);
-	wmove(input, y, posx);
+	wmove(input, y, pos);
 }
 
 void uiWindows(void) {
@@ -965,6 +967,11 @@ static void showAuto(void) {
 	}
 }
 
+static void inputEnter(uint id) {
+	command(id, editString(&edit));
+	editFn(&edit, EditClear);
+}
+
 static void keyCode(int code) {
 	struct Window *window = windows.ptrs[windows.show];
 	uint id = window->id;
@@ -973,7 +980,7 @@ static void keyCode(int code) {
 		break; case KeyFocusIn:  unmark(window);
 		break; case KeyFocusOut: mark(window);
 
-		break; case KeyMetaEnter: edit(id, EditInsert, L'\n');
+		break; case KeyMetaEnter: editInsert(&edit, L'\n');
 		break; case KeyMetaEqual: window->mute ^= true; statusUpdate();
 		break; case KeyMetaMinus: incThresh(window, -1);
 		break; case KeyMetaPlus:  incThresh(window, +1);
@@ -984,32 +991,32 @@ static void keyCode(int code) {
 
 		break; case KeyMeta0 ... KeyMeta9: uiShowNum(code - KeyMeta0);
 		break; case KeyMetaA: showAuto();
-		break; case KeyMetaB: edit(id, EditPrevWord, 0);
-		break; case KeyMetaD: edit(id, EditDeleteNextWord, 0);
-		break; case KeyMetaF: edit(id, EditNextWord, 0);
+		break; case KeyMetaB: editFn(&edit, EditPrevWord);
+		break; case KeyMetaD: editFn(&edit, EditDeleteNextWord);
+		break; case KeyMetaF: editFn(&edit, EditNextWord);
 		break; case KeyMetaL: windowList(window);
 		break; case KeyMetaM: uiWrite(id, Warm, NULL, "");
 		break; case KeyMetaN: scrollHot(window, +1);
 		break; case KeyMetaP: scrollHot(window, -1);
-		break; case KeyMetaQ: edit(id, EditCollapse, 0);
+		break; case KeyMetaQ: editFn(&edit, EditCollapse);
 		break; case KeyMetaS: spoilerReveal ^= true; mainUpdate();
 		break; case KeyMetaT: toggleTime(window);
 		break; case KeyMetaU: scrollTo(window, window->unreadHard);
 		break; case KeyMetaV: scrollPage(window, +1);
 
-		break; case KeyCtrlLeft: edit(id, EditPrevWord, 0);
-		break; case KeyCtrlRight: edit(id, EditNextWord, 0);
+		break; case KeyCtrlLeft: editFn(&edit, EditPrevWord);
+		break; case KeyCtrlRight: editFn(&edit, EditNextWord);
 
-		break; case KEY_BACKSPACE: edit(id, EditDeletePrev, 0);
-		break; case KEY_DC: edit(id, EditDeleteNext, 0);
+		break; case KEY_BACKSPACE: editFn(&edit, EditDeletePrev);
+		break; case KEY_DC: editFn(&edit, EditDeleteNext);
 		break; case KEY_DOWN: windowScroll(window, -1);
-		break; case KEY_END: edit(id, EditTail, 0);
-		break; case KEY_ENTER: edit(id, EditEnter, 0);
-		break; case KEY_HOME: edit(id, EditHead, 0);
-		break; case KEY_LEFT: edit(id, EditPrev, 0);
+		break; case KEY_END: editFn(&edit, EditTail);
+		break; case KEY_ENTER: inputEnter(id);
+		break; case KEY_HOME: editFn(&edit, EditHead);
+		break; case KEY_LEFT: editFn(&edit, EditPrev);
 		break; case KEY_NPAGE: scrollPage(window, -1);
 		break; case KEY_PPAGE: scrollPage(window, +1);
-		break; case KEY_RIGHT: edit(id, EditNext, 0);
+		break; case KEY_RIGHT: editFn(&edit, EditNext);
 		break; case KEY_SEND: scrollTo(window, 0);
 		break; case KEY_SHOME: scrollTo(window, BufferCap);
 		break; case KEY_UP: windowScroll(window, +1);
@@ -1020,33 +1027,30 @@ static void keyCtrl(wchar_t ch) {
 	struct Window *window = windows.ptrs[windows.show];
 	uint id = window->id;
 	switch (ch ^ L'@') {
-		break; case L'?': edit(id, EditDeletePrev, 0);
-		break; case L'A': edit(id, EditHead, 0);
-		break; case L'B': edit(id, EditPrev, 0);
+		break; case L'?': editFn(&edit, EditDeletePrev);
+		break; case L'A': editFn(&edit, EditHead);
+		break; case L'B': editFn(&edit, EditPrev);
 		break; case L'C': raise(SIGINT);
-		break; case L'D': edit(id, EditDeleteNext, 0);
-		break; case L'E': edit(id, EditTail, 0);
-		break; case L'F': edit(id, EditNext, 0);
-		break; case L'H': edit(id, EditDeletePrev, 0);
-		break; case L'I': edit(id, EditComplete, 0);
-		break; case L'J': edit(id, EditEnter, 0);
-		break; case L'K': edit(id, EditDeleteTail, 0);
+		break; case L'D': editFn(&edit, EditDeleteNext);
+		break; case L'E': editFn(&edit, EditTail);
+		break; case L'F': editFn(&edit, EditNext);
+		break; case L'H': editFn(&edit, EditDeletePrev);
+		break; case L'J': inputEnter(id);
+		break; case L'K': editFn(&edit, EditDeleteTail);
 		break; case L'L': clearok(curscr, true);
 		break; case L'N': uiShowNum(windows.show + 1);
 		break; case L'P': uiShowNum(windows.show - 1);
-		break; case L'R': scrollSearch(window, editBuffer(NULL), -1);
-		break; case L'S': scrollSearch(window, editBuffer(NULL), +1);
-		break; case L'T': edit(id, EditTranspose, 0);
-		break; case L'U': edit(id, EditDeleteHead, 0);
+		break; case L'R': scrollSearch(window, editString(&edit), -1);
+		break; case L'S': scrollSearch(window, editString(&edit), +1);
+		break; case L'T': editFn(&edit, EditTranspose);
+		break; case L'U': editFn(&edit, EditDeleteHead);
 		break; case L'V': scrollPage(window, -1);
-		break; case L'W': edit(id, EditDeletePrevWord, 0);
-		break; case L'X': edit(id, EditExpand, 0);
-		break; case L'Y': edit(id, EditPaste, 0);
+		break; case L'W': editFn(&edit, EditDeletePrevWord);
+		break; case L'Y': editFn(&edit, EditPaste);
 	}
 }
 
 static void keyStyle(wchar_t ch) {
-	uint id = windows.ptrs[windows.show]->id;
 	if (iswcntrl(ch)) ch = towlower(ch ^ L'@');
 	char buf[8] = {0};
 	enum Color color = Default;
@@ -1077,7 +1081,7 @@ static void keyStyle(wchar_t ch) {
 		snprintf(buf, sizeof(buf), "%c%02d", C, color);
 	}
 	for (char *ch = buf; *ch; ++ch) {
-		edit(id, EditInsert, *ch);
+		editInsert(&edit, *ch);
 	}
 }
 
@@ -1103,7 +1107,7 @@ void uiRead(void) {
 		} else if (ret == KEY_CODE_YES && ch == KeyPasteManual) {
 			paste ^= true;
 		} else if (paste || literal) {
-			edit(windows.ptrs[windows.show]->id, EditInsert, ch);
+			editInsert(&edit, ch);
 		} else if (ret == KEY_CODE_YES) {
 			keyCode(ch);
 		} else if (ch == (L'Z' ^ L'@')) {
@@ -1117,7 +1121,7 @@ void uiRead(void) {
 		} else if (iswcntrl(ch)) {
 			keyCtrl(ch);
 		} else {
-			edit(windows.ptrs[windows.show]->id, EditInsert, ch);
+			editInsert(&edit, ch);
 		}
 		style = false;
 		literal = false;