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|
package showcase
import (
"encoding/json"
"fmt"
"os"
"sort"
"strings"
"time"
)
const (
rankHistoryFilename = ".gitsyncer-showcase-rank-history.json"
rankHistoryPoints = 5
rankHistoryVersion = 1
)
// RankSnapshot stores ranking spots for all repositories on one day.
type RankSnapshot struct {
Date string `json:"date"`
Ranks map[string]int `json:"ranks"`
}
// RankHistoryStore stores all ranking snapshots used for weekly history.
type RankHistoryStore struct {
Version int `json:"version"`
Snapshots []RankSnapshot `json:"snapshots"`
}
// RepoRankHistory represents one history point for a repository.
type RepoRankHistory struct {
Spot int `json:"spot"`
Anchor string `json:"anchor"`
SnapshotDate string `json:"snapshotDate,omitempty"`
Arrow string `json:"arrow"`
}
func newRankHistoryStore() *RankHistoryStore {
return &RankHistoryStore{
Version: rankHistoryVersion,
Snapshots: []RankSnapshot{},
}
}
func loadRankHistory(path string) (*RankHistoryStore, error) {
data, err := os.ReadFile(path)
if err != nil {
if os.IsNotExist(err) {
return newRankHistoryStore(), nil
}
return nil, fmt.Errorf("read rank history file: %w", err)
}
var store RankHistoryStore
if err := json.Unmarshal(data, &store); err != nil {
return nil, fmt.Errorf("parse rank history file: %w", err)
}
if store.Version == 0 {
store.Version = rankHistoryVersion
}
if store.Snapshots == nil {
store.Snapshots = []RankSnapshot{}
}
sort.Slice(store.Snapshots, func(i, j int) bool {
return store.Snapshots[i].Date < store.Snapshots[j].Date
})
return &store, nil
}
func saveRankHistory(path string, store *RankHistoryStore) error {
data, err := json.MarshalIndent(store, "", " ")
if err != nil {
return fmt.Errorf("marshal rank history: %w", err)
}
if err := os.WriteFile(path, data, 0644); err != nil {
return fmt.Errorf("write rank history file: %w", err)
}
return nil
}
func buildCurrentRanks(sorted []ProjectSummary) map[string]int {
ranks := make(map[string]int, len(sorted))
for i, summary := range sorted {
ranks[summary.Name] = i + 1
}
return ranks
}
func upsertSnapshotForDate(store *RankHistoryStore, anchorDate time.Time, ranks map[string]int) {
day := anchorDate.Format("2006-01-02")
clonedRanks := make(map[string]int, len(ranks))
for repo, rank := range ranks {
clonedRanks[repo] = rank
}
for i := range store.Snapshots {
if store.Snapshots[i].Date == day {
store.Snapshots[i].Ranks = clonedRanks
return
}
}
store.Snapshots = append(store.Snapshots, RankSnapshot{
Date: day,
Ranks: clonedRanks,
})
sort.Slice(store.Snapshots, func(i, j int) bool {
return store.Snapshots[i].Date < store.Snapshots[j].Date
})
}
func applyRankHistoryToSummaries(summaries []ProjectSummary, store *RankHistoryStore, anchorDate time.Time, points int) {
for i := range summaries {
summaries[i].RankHistory = computeRepoHistory(store, summaries[i].Name, anchorDate, points)
}
}
func computeRepoHistory(store *RankHistoryStore, repo string, anchorDate time.Time, points int) []RepoRankHistory {
history := make([]RepoRankHistory, 0, points)
for i := 0; i < points; i++ {
target := anchorDate.AddDate(0, 0, -7*i)
targetDate := target.Format("2006-01-02")
snapshot := latestSnapshotAtOrBefore(store, targetDate)
item := RepoRankHistory{
Anchor: anchorLabel(i),
Arrow: "·",
}
if snapshot != nil {
item.SnapshotDate = snapshot.Date
if spot, ok := snapshot.Ranks[repo]; ok {
item.Spot = spot
}
}
if i > 0 {
item.Arrow = movementArrow(history[i-1].Spot, item.Spot)
}
history = append(history, item)
}
return history
}
func latestSnapshotAtOrBefore(store *RankHistoryStore, targetDate string) *RankSnapshot {
var latest *RankSnapshot
for i := range store.Snapshots {
snapshot := &store.Snapshots[i]
if snapshot.Date <= targetDate {
if latest == nil || snapshot.Date > latest.Date {
latest = snapshot
}
}
}
return latest
}
func movementArrow(currentSpot, olderSpot int) string {
if currentSpot <= 0 || olderSpot <= 0 {
return "·"
}
if currentSpot == olderSpot {
return "→"
}
if currentSpot < olderSpot {
return "↑"
}
return "↓"
}
func formatRankHistoryForHeader(history []RepoRankHistory) string {
if len(history) == 0 {
return ""
}
tokens := make([]string, 0, len(history))
for i, point := range history {
spot := fmt.Sprintf("#%d", point.Spot)
if point.Spot <= 0 {
spot = "n/a"
}
if i == 0 {
tokens = append(tokens, fmt.Sprintf("%s(%s)", spot, point.Anchor))
continue
}
tokens = append(tokens, fmt.Sprintf("%s%s(%s)", point.Arrow, spot, point.Anchor))
}
return " [" + strings.Join(tokens, " ") + "]"
}
func anchorLabel(i int) string {
if i == 0 {
return "now"
}
return fmt.Sprintf("%dw", i)
}
|
