mirror of https://github.com/docker/cli.git
91 lines
2.3 KiB
Go
91 lines
2.3 KiB
Go
package formatter
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import (
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"bytes"
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"fmt"
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"io"
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"strings"
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"text/tabwriter"
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"text/template"
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"github.com/docker/docker/utils/templates"
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)
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const (
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tableFormatKey = "table"
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rawFormatKey = "raw"
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defaultQuietFormat = "{{.ID}}"
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)
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// Context contains information required by the formatter to print the output as desired.
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type Context struct {
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// Output is the output stream to which the formatted string is written.
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Output io.Writer
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// Format is used to choose raw, table or custom format for the output.
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Format string
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// Quiet when set to true will simply print minimal information.
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Quiet bool
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// Trunc when set to true will truncate the output of certain fields such as Container ID.
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Trunc bool
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// internal element
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table bool
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finalFormat string
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header string
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buffer *bytes.Buffer
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}
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func (c *Context) preformat() {
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c.finalFormat = c.Format
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if strings.HasPrefix(c.Format, tableKey) {
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c.table = true
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c.finalFormat = c.finalFormat[len(tableKey):]
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}
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c.finalFormat = strings.Trim(c.finalFormat, " ")
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r := strings.NewReplacer(`\t`, "\t", `\n`, "\n")
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c.finalFormat = r.Replace(c.finalFormat)
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}
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func (c *Context) parseFormat() (*template.Template, error) {
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tmpl, err := templates.Parse(c.finalFormat)
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if err != nil {
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c.buffer.WriteString(fmt.Sprintf("Template parsing error: %v\n", err))
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c.buffer.WriteTo(c.Output)
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}
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return tmpl, err
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}
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func (c *Context) postformat(tmpl *template.Template, subContext subContext) {
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if c.table {
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if len(c.header) == 0 {
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// if we still don't have a header, we didn't have any containers so we need to fake it to get the right headers from the template
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tmpl.Execute(bytes.NewBufferString(""), subContext)
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c.header = subContext.fullHeader()
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}
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t := tabwriter.NewWriter(c.Output, 20, 1, 3, ' ', 0)
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t.Write([]byte(c.header))
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t.Write([]byte("\n"))
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c.buffer.WriteTo(t)
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t.Flush()
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} else {
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c.buffer.WriteTo(c.Output)
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}
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}
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func (c *Context) contextFormat(tmpl *template.Template, subContext subContext) error {
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if err := tmpl.Execute(c.buffer, subContext); err != nil {
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c.buffer = bytes.NewBufferString(fmt.Sprintf("Template parsing error: %v\n", err))
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c.buffer.WriteTo(c.Output)
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return err
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}
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if c.table && len(c.header) == 0 {
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c.header = subContext.fullHeader()
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}
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c.buffer.WriteString("\n")
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return nil
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}
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