Commit ec5a5f9093
ec5a5f9093810bc596131924ad0d80a20b53bc57
parent: ffd964b971
Verified · cmc
cmc <hello@cleberg.net> · 2026-09-25 23:15 UTC
Add format registry
Layout: unified · split
.gitignore
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1 | /photos/ |
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2 | /cache/ |
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3 | /gallery |
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4 | .superpowers/ |
go.mod
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1 | module gitbay.org/cmc/gallery |
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2 | |
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3 | go 1.27.1 |
internal/format/format.go
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1 | // Package format describes the file types the gallery can show. |
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2 | package format |
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3 | |
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4 | import ( |
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5 | "io" |
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6 | "path/filepath" |
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7 | "strings" |
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8 | "time" |
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9 | ) |
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10 | |
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11 | type Kind int |
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12 | |
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13 | const ( |
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14 | KindImage Kind = iota |
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15 | ) |
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16 | |
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17 | // Meta holds display metadata. Width and Height are after EXIF orientation. |
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18 | type Meta struct { |
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19 | Width, Height int |
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20 | Taken time.Time |
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21 | Camera, Lens string |
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22 | Aperture string |
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23 | Shutter string |
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24 | ISO int |
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25 | } |
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26 | |
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27 | type Format interface { |
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28 | Name() string |
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29 | Match(path string) bool |
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30 | Metadata(path string) (Meta, error) |
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31 | Resize(src string, width int, dst io.Writer) error |
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32 | Kind() Kind |
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33 | } |
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34 | |
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35 | // Registry resolves a path to the first registered Format that matches it. |
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36 | type Registry struct { |
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37 | formats []Format |
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38 | } |
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39 | |
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40 | func (r *Registry) Register(f Format) { |
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41 | r.formats = append(r.formats, f) |
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42 | } |
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43 | |
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44 | func (r *Registry) Lookup(path string) Format { |
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45 | for _, f := range r.formats { |
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46 | if f.Match(path) { |
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47 | return f |
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48 | } |
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49 | } |
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50 | return nil |
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51 | } |
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52 | |
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53 | func hasExt(path string, exts []string) bool { |
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54 | ext := strings.ToLower(filepath.Ext(path)) |
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55 | for _, e := range exts { |
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56 | if ext == e { |
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57 | return true |
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58 | } |
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59 | } |
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60 | return false |
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61 | } |
internal/format/format_test.go
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1 | package format |
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2 | |
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3 | import ( |
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4 | "io" |
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5 | "path/filepath" |
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6 | "strings" |
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7 | "testing" |
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8 | ) |
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9 | |
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10 | type fake struct{ name, ext string } |
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11 | |
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12 | func (f fake) Name() string { return f.name } |
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13 | func (f fake) Match(p string) bool { return strings.EqualFold(filepath.Ext(p), f.ext) } |
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14 | func (fake) Metadata(string) (Meta, error) { return Meta{}, nil } |
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15 | func (fake) Resize(string, int, io.Writer) error { return nil } |
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16 | func (fake) Kind() Kind { return KindImage } |
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17 | |
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18 | func TestRegistryFirstMatchWins(t *testing.T) { |
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19 | var r Registry |
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20 | r.Register(fake{"a", ".jpg"}) |
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21 | r.Register(fake{"b", ".jpg"}) |
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22 | r.Register(fake{"c", ".png"}) |
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23 | |
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24 | if got := r.Lookup("x/IMG.JPG"); got == nil || got.Name() != "a" { |
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25 | t.Fatalf("jpg: got %v, want a", got) |
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26 | } |
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27 | if got := r.Lookup("x.png"); got == nil || got.Name() != "c" { |
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28 | t.Fatalf("png: got %v, want c", got) |
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29 | } |
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30 | if got := r.Lookup("notes.txt"); got != nil { |
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31 | t.Fatalf("txt: got %v, want nil", got) |
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32 | } |
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33 | } |
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34 | |
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35 | func TestHasExt(t *testing.T) { |
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36 | exts := []string{".jpg", ".jpeg"} |
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37 | for p, want := range map[string]bool{ |
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38 | "a.jpg": true, "a.JPEG": true, "a.png": false, "jpg": false, "a.jpg.txt": false, |
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39 | } { |
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40 | if got := hasExt(p, exts); got != want { |
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41 | t.Errorf("hasExt(%q) = %v, want %v", p, got, want) |
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42 | } |
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43 | } |
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44 | } |