mirror of https://github.com/divan/expvarmon.git
46 lines
1.0 KiB
Go
46 lines
1.0 KiB
Go
package main
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// DefaultSize specifies maximum number of items in stack.
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//
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// Values should be enough for sparklines on high-res terminals
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// with minimal font size.
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const DefaultSize = 1200
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// Stack is a limited FIFO for holding sparkline values.
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type Stack struct {
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values []int
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len int
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}
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// NewStack inits new Stack with default size limit.
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func NewStack() *Stack {
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return NewStackWithSize(DefaultSize)
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}
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// NewStackWithSize inits new Stack with size limit.
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func NewStackWithSize(size int) *Stack {
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return &Stack{
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values: make([]int, size),
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len: size,
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}
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}
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// Push inserts data to stack, preserving constant length.
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func (s *Stack) Push(v IntVar) {
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val := v.Value()
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s.values = append(s.values, val)
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if len(s.values) > s.len {
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// TODO: check if underlying array is growing constantly
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s.values = s.values[1:]
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}
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}
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// Values returns stack values explicitly casted to int.
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//
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// Main case is to use with termui.Sparklines.
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func (s *Stack) Values() []int {
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return s.values
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}
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// TODO: implement trim and resize
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