RichString_appendChr: add parameter to set attributes

Allows to set attributes when padding process fields in non-wide ncurses
mode.

Closes: #475

Meter.c

@@ -201,7 +201,7 @@ static void BarMeterMode_draw(Meter* this, int x, int y, int w) {
    // The text in the bar is right aligned;
    // Pad with maximal spaces and then calculate needed starting position offset
    RichString_begin(bar);
-   RichString_appendChr(&bar, ' ', w);
+   RichString_appendChr(&bar, 0, ' ', w);
    RichString_appendWide(&bar, 0, buffer);
    int startPos = RichString_sizeVal(bar) - w;
    if (startPos > w) {

Process.c

@@ -246,7 +246,7 @@ void Process_outputRate(RichString* str, char* buffer, size_t n, double rate, in
 
 void Process_printLeftAlignedField(RichString* str, int attr, const char* content, unsigned int width) {
    int c = RichString_appendnWide(str, attr, content, MINIMUM(width, strlen(content)));
-   RichString_appendChr(str, ' ', width + 1 - c);
+   RichString_appendChr(str, attr, ' ', width + 1 - c);
 }
 
 void Process_writeField(const Process* this, RichString* str, ProcessField field) {

RichString.c

@@ -80,6 +80,15 @@ inline void RichString_setAttrn(RichString* this, int attrs, int start, int char
    }
 }
 
+void RichString_appendChr(RichString* this, int attrs, char c, int count) {
+   int from = this->chlen;
+   int newLen = from + count;
+   RichString_setLen(this, newLen);
+   for (int i = from; i < newLen; i++) {
+      this->chptr[i] = (CharType) { .attr = attrs, .chars = { c, 0 } };
+   }
+}
+
 int RichString_findChar(const RichString* this, char c, int start) {
    const wchar_t wc = btowc(c);
    const cchar_t* ch = this->chptr + start;
@@ -115,6 +124,15 @@ void RichString_setAttrn(RichString* this, int attrs, int start, int charcount)
    }
 }
 
+void RichString_appendChr(RichString* this, int attrs, char c, int count) {
+   int from = this->chlen;
+   int newLen = from + count;
+   RichString_setLen(this, newLen);
+   for (int i = from; i < newLen; i++) {
+      this->chptr[i] = c | attrs;
+   }
+}
+
 int RichString_findChar(const RichString* this, char c, int start) {
    const chtype* ch = this->chptr + start;
    for (int i = start; i < this->chlen; i++) {
@@ -134,15 +152,6 @@ void RichString_prune(RichString* this) {
    this->chptr = this->chstr;
 }
 
-void RichString_appendChr(RichString* this, char c, int count) {
-   int from = this->chlen;
-   int newLen = from + count;
-   RichString_setLen(this, newLen);
-   for (int i = from; i < newLen; i++) {
-      RichString_setChar(this, i, c);
-   }
-}
-
 void RichString_setAttr(RichString* this, int attrs) {
    RichString_setAttrn(this, attrs, 0, this->chlen);
 }

RichString.h

@@ -50,7 +50,7 @@ void RichString_prune(RichString* this);
 
 void RichString_setAttr(RichString* this, int attrs);
 
-void RichString_appendChr(RichString* this, char c, int count);
+void RichString_appendChr(RichString* this, int attrs, char c, int count);
 
 int RichString_appendWide(RichString* this, int attrs, const char* data);