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package layout
import (
"bufio"
"io"
"log"
"strconv"
"strings"
)
// The syntax for the layout specification is:
// ```
// (rowspan:)?widget(/weight)?
// ```
// 1. Each line is a row
// 2. Empty lines are skipped
// 3. Spaces are compressed
// 4. Legal widget names are: cpu, disk, mem, temp, batt, net, procs
// 5. Names are not case sensitive
// 4. The simplest row is a single widget, by name, e.g.
// ```
// cpu
// ```
// 5. Widgets with no weights have a weight of 1.
// 6. If multiple widgets are put on a row with no weights, they will all have
// the same width.
// 7. Weights are integers
// 8. A widget will have a width proportional to its weight divided by the
// total weight count of the row. E.g.,
// ```
// cpu net
// disk/2 mem/4
// ```
// The first row will have two widgets: the CPU and network widgets; each
// will be 50% of the total width wide. The second row will have two
// widgets: disk and memory; the first will be 2/6 ~= 33% wide, and the
// second will be 5/7 ~= 67% wide (or, memory will be twice as wide as disk).
// 9. If prefixed by a number and colon, the widget will span that number of
// rows downward. E.g.
// ```
// 2:cpu
// mem
// ```
// The CPU widget will be twice as high as the memory widget. Similarly,
// ```
// mem 2:cpu
// net
// ```
// memory and network will be in the same row as CPU, one over the other,
// and each half as high as CPU.
// 10. Negative, 0, or non-integer weights will be recorded as "1". Same for row spans.
// 11. Unrecognized widgets will cause the application to abort.
// 12. In rows with multi-row spanning widgets **and** weights, weights in
// lower rows are ignored. Put the weight on the widgets in that row, not
// in later (spanned) rows.
// 13. Widgets are filled in top down, left-to-right order.
// 14. The larges row span in a row defines the top-level row span; all smaller
// row spans constitude sub-rows in the row. For example, `cpu mem/3 net/5`
// means that net/5 will be 5 rows tall overall, and mem will compose 3 of
// them. If following rows do not have enough widgets to fill the gaps,
// spacers will be used.
func ParseLayout(i io.Reader) layout {
r := bufio.NewScanner(i)
rv := layout{Rows: make([][]widgetRule, 0)}
var lineNo int
for r.Scan() {
l := strings.TrimSpace(r.Text())
if l == "" {
continue
}
row := make([]widgetRule, 0)
ws := strings.Fields(l)
weightTotal := 0
for _, w := range ws {
wr := widgetRule{Weight: 1}
ks := strings.Split(w, "/")
rs := strings.Split(ks[0], ":")
var wid string
if len(rs) > 1 {
v, e := strconv.Atoi(rs[0])
if e != nil {
log.Printf("Layout error on line %d: format must be INT:STRING/INT. Error parsing %s as a int. Word was %s. Using a row height of 1.", lineNo, rs[0], w)
v = 1
}
if v < 1 {
v = 1
}
wr.Height = v
wid = rs[1]
} else {
wr.Height = 1
wid = rs[0]
}
wr.Widget = strings.ToLower(wid)
if len(ks) > 1 {
weight, e := strconv.Atoi(ks[1])
if e != nil {
log.Printf("Layout error on line %d: format must be STRING/INT. Error parsing %s as a int. Word was %s. Using a weight of 1 for widget.", lineNo, ks[1], w)
weight = 1
}
if weight < 1 {
weight = 1
}
wr.Weight = float64(weight)
if len(ks) > 2 {
log.Printf("Layout warning on line %d: too many '/' in word %s; ignoring extra junk.", lineNo, w)
}
weightTotal += weight
} else {
weightTotal += 1
}
row = append(row, wr)
}
// Prevent tricksy users from breaking their own computers
if weightTotal <= 1 {
weightTotal = 1
}
for i, w := range row {
row[i].Weight = w.Weight / float64(weightTotal)
}
rv.Rows = append(rv.Rows, row)
}
return rv
}
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