LoadMeter: dynamically adjust color and total of bar

Change the color and total based on the actual 1min load value:

    < 1         : green and total of 1.0
    < cpu-count : yellow and total of cpu-count
    else        : red and total of 2*cpu-count

Closes: #32

LoadAverageMeter.c

@@ -24,8 +24,36 @@ static const int LoadMeter_attributes[] = {
    LOAD
 };
 
+static const int OK_attributes[] = {
+   METER_VALUE_OK
+};
+
+static const int Medium_attributes[] = {
+   METER_VALUE_WARN
+};
+
+static const int High_attributes[] = {
+   METER_VALUE_ERROR
+};
+
 static void LoadAverageMeter_updateValues(Meter* this, char* buffer, size_t size) {
    Platform_getLoadAverage(&this->values[0], &this->values[1], &this->values[2]);
+
+   // only show bar for 1min value
+   this->curItems = 1;
+
+   // change bar color and total based on value
+   if (this->values[0] < 1.0) {
+      this->curAttributes = OK_attributes;
+      this->total = 1.0;
+   } else if (this->values[0] < this->pl->cpuCount) {
+      this->curAttributes = Medium_attributes;
+      this->total = this->pl->cpuCount;
+   } else {
+      this->curAttributes = High_attributes;
+      this->total = 2 * this->pl->cpuCount;
+   }
+
    xSnprintf(buffer, size, "%.2f/%.2f/%.2f", this->values[0], this->values[1], this->values[2]);
 }
 
@@ -43,9 +71,19 @@ static void LoadAverageMeter_display(const Object* cast, RichString* out) {
 static void LoadMeter_updateValues(Meter* this, char* buffer, size_t size) {
    double five, fifteen;
    Platform_getLoadAverage(&this->values[0], &five, &fifteen);
-   if (this->values[0] > this->total) {
-      this->total = this->values[0];
+
+   // change bar color and total based on value
+   if (this->values[0] < 1.0) {
+      this->curAttributes = OK_attributes;
+      this->total = 1.0;
+   } else if (this->values[0] < this->pl->cpuCount) {
+      this->curAttributes = Medium_attributes;
+      this->total = this->pl->cpuCount;
+   } else {
+      this->curAttributes = High_attributes;
+      this->total = 2 * this->pl->cpuCount;
    }
+
    xSnprintf(buffer, size, "%.2f", this->values[0]);
 }
 

Meter.c

@@ -39,6 +39,7 @@ Meter* Meter_new(const struct ProcessList_* pl, int param, const MeterClass* typ
    this->param = param;
    this->pl = pl;
    this->curItems = type->maxItems;
+   this->curAttributes = NULL;
    this->values = type->maxItems ? xCalloc(type->maxItems, sizeof(double)) : NULL;
    this->total = type->total;
    this->caption = xStrdup(type->caption);
@@ -252,7 +253,8 @@ static void BarMeterMode_draw(Meter* this, int x, int y, int w) {
    // ...then print the buffer.
    offset = 0;
    for (uint8_t i = 0; i < this->curItems; i++) {
-      RichString_setAttrn(&bar, CRT_colors[Meter_attributes(this)[i]], startPos + offset, startPos + offset + blockSizes[i] - 1);
+      int attr = this->curAttributes ? this->curAttributes[i] : Meter_attributes(this)[i];
+      RichString_setAttrn(&bar, CRT_colors[attr], startPos + offset, startPos + offset + blockSizes[i] - 1);
       RichString_printoffnVal(bar, y, x + offset, startPos + offset, MINIMUM(blockSizes[i], w - offset));
       offset += blockSizes[i];
       offset = CLAMP(offset, 0, w);

Meter.h

@@ -100,6 +100,7 @@ struct Meter_ {
    int h;
    const ProcessList* pl;
    uint8_t curItems;
+   const int* curAttributes;
    double* values;
    double total;
    void* meterData;