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Round language stats percentage using largest remainder (#22026)

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Fix #22023 

I've changed how the percentages for the language statistics are rounded
because they did not always add up to 100%
Now it's done with the largest remainder method, which makes sure that
total is 100%

Co-authored-by: Lauris BH <lauris@nix.lv>
This commit is contained in:
hr-98 2022-12-08 02:47:47 +00:00 • committed by GitHub
commit cf27403e18
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 36 additions and 4 deletions
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40
models/repo/language_stats.go
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@ -6,6 +6,7 @@ package repo
import (
"context"
"math"
"sort"
"strings"
"code.gitea.io/gitea/models/db"
@ -43,7 +44,7 @@ func (stats LanguageStatList) LoadAttributes() {
func (stats LanguageStatList) getLanguagePercentages() map[string]float32 {
langPerc := make(map[string]float32)
var otherPerc float32 = 100
var otherPerc float32
var total int64
for _, stat := range stats {
@ -51,21 +52,52 @@ func (stats LanguageStatList) getLanguagePercentages() map[string]float32 {
}
if total > 0 {
for _, stat := range stats {
perc := float32(math.Round(float64(stat.Size)/float64(total)*1000) / 10)
perc := float32(float64(stat.Size) / float64(total) * 100)
if perc <= 0.1 {
otherPerc += perc
continue
}
otherPerc -= perc
langPerc[stat.Language] = perc
}
otherPerc = float32(math.Round(float64(otherPerc)*10) / 10)
}
if otherPerc > 0 {
langPerc["other"] = otherPerc
}
roundByLargestRemainder(langPerc, 100)
return langPerc
}
// Rounds to 1 decimal point, target should be the expected sum of percs
func roundByLargestRemainder(percs map[string]float32, target float32) {
leftToDistribute := int(target * 10)
keys := make([]string, 0, len(percs))
for k, v := range percs {
percs[k] = v * 10
floored := math.Floor(float64(percs[k]))
leftToDistribute -= int(floored)
keys = append(keys, k)
}
// Sort the keys by the largest remainder
sort.SliceStable(keys, func(i, j int) bool {
_, remainderI := math.Modf(float64(percs[keys[i]]))
_, remainderJ := math.Modf(float64(percs[keys[j]]))
return remainderI > remainderJ
})
// Increment the values in order of largest remainder
for _, k := range keys {
percs[k] = float32(math.Floor(float64(percs[k])))
if leftToDistribute > 0 {
percs[k]++
leftToDistribute--
}
percs[k] /= 10
}
}
// GetLanguageStats returns the language statistics for a repository
func GetLanguageStats(ctx context.Context, repo *Repository) (LanguageStatList, error) {
stats := make(LanguageStatList, 0, 6)