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ui/table: Add small package for writing tables
This commit is contained in:
Alexander Neumann
parent
d708d607fa
commit
12246969db
206
internal/ui/table/table.go
Normal file
206
internal/ui/table/table.go
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@ -0,0 +1,206 @@
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package table
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import (
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"bytes"
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"io"
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"strings"
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"text/template"
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)
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// Table contains data for a table to be printed.
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type Table struct {
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columns []string
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templates []*template.Template
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data []interface{}
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footer []string
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CellSeparator string
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PrintHeader func(io.Writer, string) error
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PrintSeparator func(io.Writer, string) error
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PrintData func(io.Writer, int, string) error
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PrintFooter func(io.Writer, string) error
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}
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var funcmap = template.FuncMap{
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"join": strings.Join,
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}
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// New initializes a new Table
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func New() *Table {
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p := func(w io.Writer, s string) error {
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_, err := w.Write(append([]byte(s), '\n'))
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return err
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}
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return &Table{
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CellSeparator: " ",
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PrintHeader: p,
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PrintSeparator: p,
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PrintData: func(w io.Writer, _ int, s string) error {
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return p(w, s)
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},
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PrintFooter: p,
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}
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}
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// AddColumn adds a new header field with the header and format, which is
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// expected to be template string compatible with text/template. When compiling
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// the format fails, AddColumn panics.
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func (t *Table) AddColumn(header, format string) {
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t.columns = append(t.columns, header)
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tmpl, err := template.New("template for " + header).Funcs(funcmap).Parse(format)
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if err != nil {
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panic(err)
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}
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t.templates = append(t.templates, tmpl)
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}
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// AddRow adds a new row to the table, which is filled with data.
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func (t *Table) AddRow(data interface{}) {
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t.data = append(t.data, data)
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}
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// AddFooter prints line after the table
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func (t *Table) AddFooter(line string) {
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t.footer = append(t.footer, line)
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}
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func printLine(w io.Writer, print func(io.Writer, string) error, sep string, data []string, widths []int) error {
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var fields [][]string
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maxLines := 1
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for _, d := range data {
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lines := strings.Split(d, "\n")
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if len(lines) > maxLines {
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maxLines = len(lines)
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}
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fields = append(fields, lines)
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}
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for i := 0; i < maxLines; i++ {
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var s string
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for fieldNum, lines := range fields {
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var v string
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if i < len(lines) {
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v += lines[i]
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}
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// apply padding
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pad := widths[fieldNum] - len(v)
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if pad > 0 {
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v += strings.Repeat(" ", pad)
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}
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if fieldNum > 0 {
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v = sep + v
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}
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s += v
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}
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err := print(w, strings.TrimRight(s, " "))
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if err != nil {
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return err
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}
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}
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return nil
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}
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// Write prints the table to w.
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func (t *Table) Write(w io.Writer) error {
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columns := len(t.templates)
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if columns == 0 {
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return nil
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}
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// collect all data fields from all columns
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lines := make([][]string, 0, len(t.data))
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buf := bytes.NewBuffer(nil)
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for _, data := range t.data {
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row := make([]string, 0, len(t.templates))
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for _, tmpl := range t.templates {
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err := tmpl.Execute(buf, data)
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if err != nil {
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return err
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}
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row = append(row, string(buf.Bytes()))
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buf.Reset()
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}
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lines = append(lines, row)
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}
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// find max width for each cell
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columnWidths := make([]int, columns)
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for i, desc := range t.columns {
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for _, line := range strings.Split(desc, "\n") {
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if columnWidths[i] < len(line) {
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columnWidths[i] = len(desc)
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}
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}
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}
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for _, line := range lines {
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for i, content := range line {
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for _, l := range strings.Split(content, "\n") {
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if columnWidths[i] < len(l) {
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columnWidths[i] = len(l)
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}
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}
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}
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}
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// calculate the total width of the table
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totalWidth := 0
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for _, width := range columnWidths {
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totalWidth += width
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}
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totalWidth += (columns - 1) * len(t.CellSeparator)
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// write header
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if len(t.columns) > 0 {
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err := printLine(w, t.PrintHeader, t.CellSeparator, t.columns, columnWidths)
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if err != nil {
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return err
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}
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// draw separation line
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err = t.PrintSeparator(w, strings.Repeat("-", totalWidth))
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if err != nil {
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return err
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}
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}
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// write all the lines
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for i, line := range lines {
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print := func(w io.Writer, s string) error {
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return t.PrintData(w, i, s)
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}
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err := printLine(w, print, t.CellSeparator, line, columnWidths)
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if err != nil {
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return err
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}
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}
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// draw separation line
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err := t.PrintSeparator(w, strings.Repeat("-", totalWidth))
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if err != nil {
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return err
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}
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if len(t.footer) > 0 {
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// write the footer
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for _, line := range t.footer {
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err := t.PrintFooter(w, line)
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if err != nil {
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return err
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}
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}
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}
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return nil
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}
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162
internal/ui/table/table_test.go
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162
internal/ui/table/table_test.go
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@ -0,0 +1,162 @@
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package table
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import (
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"bytes"
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"strings"
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"testing"
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)
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func TestTable(t *testing.T) {
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var tests = []struct {
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create func(t testing.TB) *Table
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output string
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}{
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{
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func(t testing.TB) *Table {
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return New()
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},
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"",
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},
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{
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func(t testing.TB) *Table {
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table := New()
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table.AddColumn("first column", "data: {{.First}}")
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table.AddRow(struct{ First string }{"first data field"})
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return table
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},
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`
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first column
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----------------------
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data: first data field
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----------------------
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`,
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},
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{
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func(t testing.TB) *Table {
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table := New()
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table.AddColumn(" first column ", "data: {{.First}}")
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table.AddRow(struct{ First string }{"d"})
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return table
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},
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`
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first column
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----------------
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data: d
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----------------
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`,
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},
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{
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func(t testing.TB) *Table {
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table := New()
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table.AddColumn("first column", "data: {{.First}}")
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table.AddRow(struct{ First string }{"first data field"})
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table.AddRow(struct{ First string }{"second data field"})
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table.AddFooter("footer1")
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table.AddFooter("footer2")
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return table
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},
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`
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first column
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-----------------------
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data: first data field
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data: second data field
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-----------------------
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footer1
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footer2
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`,
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},
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{
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func(t testing.TB) *Table {
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table := New()
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table.AddColumn(" first name", `{{printf "%12s" .FirstName}}`)
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table.AddColumn("last name", "{{.LastName}}")
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table.AddRow(struct{ FirstName, LastName string }{"firstname", "lastname"})
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table.AddRow(struct{ FirstName, LastName string }{"John", "Doe"})
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table.AddRow(struct{ FirstName, LastName string }{"Johann", "van den Berjen"})
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return table
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},
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`
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first name last name
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----------------------------
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firstname lastname
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John Doe
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Johann van den Berjen
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----------------------------
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`,
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},
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{
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func(t testing.TB) *Table {
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table := New()
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table.AddColumn("host name", `{{.Host}}`)
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table.AddColumn("time", `{{.Time}}`)
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table.AddColumn("zz", "xxx")
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table.AddColumn("tags", `{{join .Tags ","}}`)
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table.AddColumn("dirs", `{{join .Dirs ","}}`)
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type data struct {
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Host string
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Time string
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Tags, Dirs []string
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}
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table.AddRow(data{"foo", "2018-08-19 22:22:22", []string{"work"}, []string{"/home/user/work"}})
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table.AddRow(data{"foo", "2018-08-19 22:22:22", []string{"other"}, []string{"/home/user/other"}})
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table.AddRow(data{"foo", "2018-08-19 22:22:22", []string{"other"}, []string{"/home/user/other"}})
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return table
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},
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`
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host name time zz tags dirs
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------------------------------------------------------------
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foo 2018-08-19 22:22:22 xxx work /home/user/work
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foo 2018-08-19 22:22:22 xxx other /home/user/other
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foo 2018-08-19 22:22:22 xxx other /home/user/other
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------------------------------------------------------------
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`,
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},
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{
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func(t testing.TB) *Table {
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table := New()
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table.AddColumn("host name", `{{.Host}}`)
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table.AddColumn("time", `{{.Time}}`)
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table.AddColumn("zz", "xxx")
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table.AddColumn("tags", `{{join .Tags "\n"}}`)
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table.AddColumn("dirs", `{{join .Dirs "\n"}}`)
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type data struct {
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Host string
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Time string
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Tags, Dirs []string
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}
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table.AddRow(data{"foo", "2018-08-19 22:22:22", []string{"work", "go"}, []string{"/home/user/work", "/home/user/go"}})
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table.AddRow(data{"foo", "2018-08-19 22:22:22", []string{"other"}, []string{"/home/user/other"}})
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table.AddRow(data{"foo", "2018-08-19 22:22:22", []string{"other", "bar"}, []string{"/home/user/other"}})
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return table
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},
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`
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host name time zz tags dirs
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------------------------------------------------------------
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foo 2018-08-19 22:22:22 xxx work /home/user/work
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go /home/user/go
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foo 2018-08-19 22:22:22 xxx other /home/user/other
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foo 2018-08-19 22:22:22 xxx other /home/user/other
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bar
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------------------------------------------------------------
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`,
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},
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}
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for _, test := range tests {
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t.Run("", func(t *testing.T) {
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table := test.create(t)
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buf := bytes.NewBuffer(nil)
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err := table.Write(buf)
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if err != nil {
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t.Fatal(err)
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}
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want := strings.TrimLeft(test.output, "\n")
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if string(buf.Bytes()) != want {
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t.Errorf("wrong output\n---- want ---\n%s\n---- got ---\n%s\n-------\n", want, buf.Bytes())
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}
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})
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}
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}
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