Added supporting code that appends to registers if capitals are used

src/ex.c

@@ -1056,8 +1056,8 @@ static VbCmdResult ex_register(Client *c, const ExArg *arg)
     for (idx = 0; idx < REG_SIZE; idx++) {
         /* show only filled registers */
         if (c->state.reg[idx]) {
-            /* replace all newlines */
-            reg = util_str_replace("\n", "^J", c->state.reg[idx]);
+            /* replace all newlines with enough spaces to align nicely */
+            reg = util_str_replace("\n", "\n     ", c->state.reg[idx]);
             g_string_append_printf(str, "\n\"%c   %s", regchars[idx], reg);
             g_free(reg);
         }

src/main.c

@@ -527,17 +527,30 @@ void vb_register_add(Client *c, char buf, const char *value)
 {
     char *mark;
     int idx;
+    bool shouldAppend = false;
 
     if (!c->state.enable_register || !buf) {
         return;
     }
 
+    /* check if its capital letter, if yes - append, don't overwrite */
+    if(buf >= 'A' && buf <= 'Z') {
+      shouldAppend = true;
+      // 32 is the magic number - ASCII offset from start of uppercase
+      // to lowercase letters
+      buf = buf + 32;
+    }
+
     /* make sure the mark is a valid mark char */
     if ((mark = strchr(REG_CHARS, buf))) {
         /* get the index of the mark char */
         idx = mark - REG_CHARS;
 
-        OVERWRITE_STRING(c->state.reg[idx], value);
+        gchar* newcontents = value;
+        if(shouldAppend && c->state.reg[idx])
+            newcontents = g_strjoin("\n", c->state.reg[idx], value, NULL);
+
+        OVERWRITE_STRING(c->state.reg[idx], newcontents);
     }
 }
 

src/main.h

@@ -63,7 +63,7 @@
 
 #define GLOBAL_MARK_CHARS   "'ABCDEFGHIJKLMNOPQRSTUVWXYZ"
 
-#define USER_REG     "abcdefghijklmnopqrstuvwxyz"
+#define USER_REG     "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
 /* registers in order displayed for :register command */
 #define REG_CHARS    "\"" USER_REG ":%/;"
 #define REG_SIZE     (sizeof(REG_CHARS) - 1)