Accept wide chars in filter input (#1038)

Notably this doesn't handle wcwidth!=1 or extended grapheme clusters, but you
can filter for your emoji process now.

FunctionBar.c

@@ -92,6 +92,25 @@ int FunctionBar_draw(const FunctionBar* this) {
    return FunctionBar_drawExtra(this, NULL, -1, false);
 }
 
+static size_t FunctionBar_displayWidth(const char *s) {
+   size_t slen = strlen(s);
+   size_t width = 0, i = 0;
+
+   mbtowc(NULL, 0, 0);
+
+   while (i < slen) {
+      wchar_t wch;
+      int mblen = mbtowc(&wch, s + i, slen - i);
+      if (mblen <= 0) {
+         return slen;
+      }
+      i += mblen;
+      width += wcwidth(wch);
+   }
+
+   return width;
+}
+
 int FunctionBar_drawExtra(const FunctionBar* this, const char* buffer, int attr, bool setCursor) {
    int cursorX = 0;
    attrset(CRT_colors[FUNCTION_BAR]);
@@ -113,7 +132,8 @@ int FunctionBar_drawExtra(const FunctionBar* this, const char* buffer, int attr,
          attrset(attr);
       }
       mvaddstr(LINES - 1, x, buffer);
-      x += strlen(buffer);
+      x += FunctionBar_displayWidth(buffer);
+
       cursorX = x;
    }
 

IncSet.c

@@ -10,8 +10,10 @@ in the source distribution for its full text.
 #include "IncSet.h"
 
 #include <ctype.h>
-#include <string.h>
+#include <limits.h>
 #include <stdlib.h>
+#include <string.h>
+#include <wctype.h>
 
 #include "CRT.h"
 #include "ListItem.h"
@@ -155,6 +157,23 @@ static bool IncMode_find(const IncMode* mode, Panel* panel, IncMode_GetPanelValu
    }
 }
 
+static int IncSet_backspaceLen(const char *s, size_t slen) {
+   size_t i = 0;
+   int mblen = 0;
+
+   mbtowc(NULL, 0, 0);
+
+   while (i < slen) {
+      mblen = mbtowc(NULL, s + i, slen - i);
+      if (mblen <= 0) {
+         return slen - i;
+      }
+      i += mblen;
+   }
+
+   return mblen;
+}
+
 bool IncSet_handleKey(IncSet* this, int ch, Panel* panel, IncMode_GetPanelValue getPanelValue, Vector* lines) {
    if (ch == ERR)
       return true;
@@ -169,7 +188,7 @@ bool IncSet_handleKey(IncSet* this, int ch, Panel* panel, IncMode_GetPanelValue
 
       IncMode_find(mode, panel, getPanelValue, ch == KEY_F(3) ? 1 : -1);
       doSearch = false;
-   } else if (0 < ch && ch < 255 && isprint((unsigned char)ch)) {
+   } else if (iswprint(Panel_getLastWkey())) {
       if (mode->index < INCMODE_MAX) {
          mode->buffer[mode->index] = (char) ch;
          mode->index++;
@@ -183,8 +202,9 @@ bool IncSet_handleKey(IncSet* this, int ch, Panel* panel, IncMode_GetPanelValue
       }
    } else if (ch == KEY_BACKSPACE || ch == 127) {
       if (mode->index > 0) {
-         mode->index--;
+         mode->index -= IncSet_backspaceLen(mode->buffer, mode->index);
          mode->buffer[mode->index] = 0;
+
          if (mode->isFilter) {
             filterChanged = true;
             if (mode->index == 0) {

Panel.c

@@ -9,6 +9,7 @@ in the source distribution for its full text.
 
 #include <assert.h>
 #include <ctype.h>
+#include <limits.h>
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
@@ -22,6 +23,8 @@ in the source distribution for its full text.
 #include "XUtils.h"
 
 
+static wint_t last_wkey = 0;
+
 const PanelClass Panel_class = {
    .super = {
       .extends = Class(Object),
@@ -503,5 +506,39 @@ int Panel_getCh(Panel* this) {
 #ifdef HAVE_SET_ESCDELAY
    set_escdelay(25);
 #endif
-   return getch();
+
+#ifdef HAVE_LIBNCURSESW
+   static char mbbuf[MB_LEN_MAX];
+   static size_t mbbuf_len = 0, mbbuf_i = 0;
+
+   if (mbbuf_i < mbbuf_len) {
+      return mbbuf[mbbuf_i++];
+   }
+
+   wint_t wkey;
+   int wchrv = get_wch(&wkey);
+   wchar_t wch = (wchar_t)wkey;
+
+   if (wchrv == OK) {
+      mbbuf_i = 0;
+      mbbuf_len = wcrtomb(mbbuf, wch, NULL);
+      if (mbbuf_len == (size_t)-1) {
+         mbbuf_len = 0;
+         return wkey;
+      }
+      last_wkey = wkey;
+      return mbbuf[mbbuf_i++];
+   } else if (wchrv == KEY_CODE_YES) {
+      last_wkey = 0;
+      return wch;
+   }
+
+   return ERR;
+#else
+   return last_wkey = getch();
+#endif
+}
+
+wint_t Panel_getLastWkey(void) {
+   return last_wkey;
 }

Panel.h

@@ -11,6 +11,7 @@ in the source distribution for its full text.
 
 #include <assert.h>
 #include <stdbool.h>
+#include <wchar.h>
 
 #include "CRT.h"
 #include "FunctionBar.h"
@@ -140,4 +141,6 @@ HandlerResult Panel_selectByTyping(Panel* this, int ch);
 
 int Panel_getCh(Panel* this);
 
+wint_t Panel_getLastWkey(void);
+
 #endif