init

util/strings.go

@@ -0,0 +1,57 @@
+package util
+
+import (
+	"strings"
+)
+
+func CapitalizeFirst(s string) string {
+	if len(s) == 0 {
+		return s
+	}
+	return strings.ToUpper(s[:1]) + s[1:]
+}
+
+// A StringTabulator aligns columns similarly to the tabulator
+// character (but 100% rigorously).
+type StringTabulator [][]string
+
+func (t *StringTabulator) WriteRow(cols ...string) {
+	*t = append(*t, cols)
+}
+
+func (t *StringTabulator) String() string {
+	if t == nil {
+		return ""
+	}
+
+	// Find which row has the most columns.
+	longestRow := 0
+	for _, row := range *t {
+		if len(row) > longestRow {
+			longestRow = len(row)
+		}
+	}
+
+	// For each column, find the field with the longest string.
+	longestField := make([]int, longestRow)
+	for _, row := range *t {
+		for i, col := range row {
+			if len(col) > longestField[i] {
+				longestField[i] = len(col)
+			}
+		}
+	}
+
+	// Add each line tabulated.
+	var res strings.Builder
+	for _, row := range *t {
+		for i, col := range row {
+			res.WriteString(col)
+			res.WriteString(strings.Repeat(" ", longestField[i]-len(col)))
+		}
+		res.WriteString("\n")
+	}
+
+	// Return the result.
+	return res.String()
+}

util/time.go

@@ -0,0 +1,41 @@
+package util
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// Convert a duration specifier to seconds (e.g. 64 (seconds), 1:04, 0:1:04 etc.)
+func ParseDurationSeconds(s string) (int, error) {
+	var secs int
+	sp := strings.Split(s, ":")
+	if len(sp) < 1 || len(sp) > 3 {
+		return 0, errors.New("invalid duration format")
+	}
+	magnitude := 1
+	for i := len(sp) - 1; i >= 0; i-- {
+		n, err := strconv.Atoi(sp[i])
+		if n < 0 || err != nil {
+			return 0, errors.New("invalid duration")
+		}
+		secs += n * magnitude
+		magnitude *= 60
+	}
+	return secs, nil
+}
+
+func FormatDurationSeconds(s int) string {
+	var h, m int
+	h = s / 3600
+	s -= h * 3600
+	m = s / 60
+	s -= m * 60
+
+	var hs string
+	if h > 0 {
+		hs = fmt.Sprintf("%02d:", h)
+	}
+	return fmt.Sprintf("%s%02d:%02d", hs, m, s)
+}