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package chrome |
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import ( |
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"fmt" |
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"html/template" |
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"time" |
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) |
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// Funcs returns the template helpers every service was carrying its own copy |
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// of. Merge into a service's FuncMap before its own helpers, so a service can |
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// still shadow a name deliberately. |
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func Funcs() template.FuncMap { |
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return template.FuncMap{ |
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"dict": Dict, |
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"shortsha": ShortSHA, |
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"reltime": RelTime, |
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"abstime": AbsTime, |
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} |
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} |
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// Dict builds a map from alternating key/value arguments, so a partial that |
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// needs several fields can be invoked with an inline context: |
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// {{template "x" (dict "A" .A "B" .B)}}. An odd argument count or a non-string |
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// key is a template authoring error and surfaces as a render error. |
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func Dict(kv ...any) (map[string]any, error) { |
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if len(kv)%2 != 0 { |
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return nil, fmt.Errorf("dict: expected an even number of arguments, got %d", len(kv)) |
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} |
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m := make(map[string]any, len(kv)/2) |
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for i := 0; i < len(kv); i += 2 { |
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k, ok := kv[i].(string) |
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if !ok { |
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return nil, fmt.Errorf("dict: key %d is not a string", i) |
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} |
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m[k] = kv[i+1] |
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} |
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return m, nil |
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} |
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// ShortSHA abbreviates an object id to its first 8 characters (or returns it |
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// unchanged if shorter), the convention used everywhere commits are listed. |
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func ShortSHA(s string) string { |
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if len(s) > 8 { |
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return s[:8] |
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} |
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return s |
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} |
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// RelTime is the coarse "3 hours ago" a listing wants, and AbsTime the exact |
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// UTC stamp an investigation wants. Both exist, and both are shared, because |
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// every service on the instance shows the same two columns and had grown its |
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// own spelling of them: the copies disagreed about the future, printing "in 3 |
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// hours" on one service and "just now" on the next for the same instant. |
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// |
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// A future instant gets the same arithmetic as a past one. "in 3 weeks" |
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// answers "do I have to deal with this today" without the reader working it |
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// out from a calendar stamp. |
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func RelTime(t time.Time) string { |
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d := time.Since(t) |
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switch { |
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case d < -time.Minute: |
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return "in " + coarse(-d) |
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case d < time.Minute: |
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// Covers both an instant that has just passed and one about to, which |
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// is also what two machines with unsynchronised clocks produce for the |
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// same instant. |
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return "just now" |
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default: |
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return coarse(d) + " ago" |
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} |
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} |
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// AbsTime is the unambiguous stamp, one hover away from a RelTime. |
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func AbsTime(t time.Time) string { |
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return t.UTC().Format("2006-01-02 15:04:05 UTC") |
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} |
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// coarse names a positive duration in its largest whole unit. The direction is |
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// the caller's to add, so that "in 3 weeks" and "3 weeks ago" cannot end up |
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// counting in different units. |
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func coarse(d time.Duration) string { |
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switch { |
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case d < time.Hour: |
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return plural(int(d/time.Minute), "minute") |
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case d < 24*time.Hour: |
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return plural(int(d/time.Hour), "hour") |
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case d < 30*24*time.Hour: |
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return plural(int(d/(24*time.Hour)), "day") |
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case d < 365*24*time.Hour: |
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return plural(int(d/(30*24*time.Hour)), "month") |
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default: |
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return plural(int(d/(365*24*time.Hour)), "year") |
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} |
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} |
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func plural(n int, unit string) string { |
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if n == 1 { |
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return "1 " + unit |
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} |
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return fmt.Sprintf("%d %ss", n, unit) |
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} |