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template-strings/templatestrings.go

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package templatestrings
import (
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"errors"
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"io/fs"
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"os"
"path/filepath"
"gopkg.in/yaml.v3"
)
type TemplateStrings struct {
templateStrings map[string]map[string]string
defaultVariant string
}
// Load the strings from the specified files into memory
func InitTemplateStrings(stringsDir string, fileExt string, defaultVariant string, otherVariants ...string) (*TemplateStrings, error) {
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return InitTemplateStringsFS(os.DirFS("."), stringsDir, fileExt, defaultVariant, otherVariants...)
}
// Load the strings from the specified files using a file system into memory
func InitTemplateStringsFS(filesystem fs.FS, stringsDir string, fileExt string, defaultVariant string, otherVariants ...string) (*TemplateStrings, error) {
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ts := &TemplateStrings{
map[string]map[string]string{},
defaultVariant,
}
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// Check directory
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if stat, err := fs.Stat(filesystem, stringsDir); err != nil {
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return nil, err
} else if !stat.IsDir() {
return nil, errors.New("specified directory is no dir")
}
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// Load strings
variants := append(otherVariants, defaultVariant)
for _, variant := range variants {
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// Check if variant is empty
if variant == "" {
return nil, errors.New("language variant needs to have a name")
}
// Check if variant already loaded
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if _, ok := ts.templateStrings[variant]; ok {
continue
}
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fb, err := fs.ReadFile(filesystem, filepath.Join(stringsDir, variant+fileExt))
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if err != nil {
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// Just ignore the file
continue
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}
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variantStrings := map[string]string{}
if err = yaml.Unmarshal(fb, variantStrings); err != nil {
// Error loading YAML
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return nil, err
}
ts.templateStrings[variant] = variantStrings
}
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// Checks
if len(ts.templateStrings) == 0 {
return nil, errors.New("no variants initialized")
}
if _, ok := ts.templateStrings[ts.defaultVariant]; !ok {
return nil, errors.New("default variant not loaded")
}
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return ts, nil
}
// Get a string
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// input: language, name or just name (uses default language)
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func (ts *TemplateStrings) GetTemplateStringVariant(input ...string) (result string) {
var lang, name string
if l := len(input); l == 1 {
// Use default variant
lang = ts.defaultVariant
name = input[0]
} else if l == 2 {
// Use specified variant
lang = input[0]
name = input[1]
} else {
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// Wrong number of input strings, return empty string
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return ""
}
m, ok := ts.templateStrings[lang]
if !ok {
m = ts.templateStrings[ts.defaultVariant]
}
result, ok = m[name]
if !ok {
result = ts.templateStrings[ts.defaultVariant][name]
}
return
}
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// Get a function to use in templates
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func (ts *TemplateStrings) GetTemplateStringVariantFunc() func(...string) string {
return func(s ...string) string {
return ts.GetTemplateStringVariant(s...)
}
}