tablizer/lib/printer.go

/*
Copyright © 2022 Thomas von Dein

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/

package lib

import (
	"encoding/csv"
	"fmt"
	"io"
	"log"
	"regexp"
	"strconv"
	"strings"

	"github.com/gookit/color"
	"github.com/olekukonko/tablewriter"
	"github.com/tlinden/tablizer/cfg"
	"gopkg.in/yaml.v3"
)

func printData(writer io.Writer, conf cfg.Config, data *Tabdata) {
	//  Sort   the  data  first,  before   headers+entries  are  being
	// reduced. That way the user can specify any valid column to sort
	// by, independently if it's being used for display or not.
	sortTable(conf, data)

	// add numbers to headers and remove those we're not interested in
	numberizeAndReduceHeaders(conf, data)

	// remove unwanted columns, if any
	reduceColumns(conf, data)

	switch conf.OutputMode {
	case cfg.Extended:
		printExtendedData(writer, conf, data)
	case cfg.ASCII:
		printASCIIData(writer, conf, data)
	case cfg.Orgtbl:
		printOrgmodeData(writer, conf, data)
	case cfg.Markdown:
		printMarkdownData(writer, conf, data)
	case cfg.Shell:
		printShellData(writer, data)
	case cfg.Yaml:
		printYamlData(writer, data)
	case cfg.CSV:
		printCSVData(writer, data)
	default:
		printASCIIData(writer, conf, data)
	}
}

func output(writer io.Writer, str string) {
	fmt.Fprint(writer, str)
}

/*
Emacs org-mode compatible table (also orgtbl-mode)
*/
func printOrgmodeData(writer io.Writer, conf cfg.Config, data *Tabdata) {
	tableString := &strings.Builder{}
	table := tablewriter.NewWriter(tableString)

	if !conf.NoHeaders {
		table.SetHeader(data.headers)
	}

	for _, row := range data.entries {
		table.Append(trimRow(row))
	}

	table.Render()

	/* fix output for org-mode (orgtbl)
	   tableWriter output:
	   +------+------+
	   | cell | cell |
	   +------+------+

	   Needed for org-mode compatibility:
	   |------+------|
	   | cell | cell |
	   |------+------|
	*/
	leftR := regexp.MustCompile(`(?m)^\\+`)
	rightR := regexp.MustCompile(`\\+(?m)$`)

	output(writer, color.Sprint(
		colorizeData(conf,
			rightR.ReplaceAllString(
				leftR.ReplaceAllString(tableString.String(), "|"), "|"))))
}

/*
Markdown table
*/
func printMarkdownData(writer io.Writer, conf cfg.Config, data *Tabdata) {
	tableString := &strings.Builder{}
	table := tablewriter.NewWriter(tableString)

	if !conf.NoHeaders {
		table.SetHeader(data.headers)
	}

	for _, row := range data.entries {
		table.Append(trimRow(row))
	}

	table.SetBorders(tablewriter.Border{Left: true, Top: false, Right: true, Bottom: false})
	table.SetCenterSeparator("|")

	table.Render()
	output(writer, color.Sprint(colorizeData(conf, tableString.String())))
}

/*
Simple ASCII table without any borders etc, just like the input we expect
*/
func printASCIIData(writer io.Writer, conf cfg.Config, data *Tabdata) {
	tableString := &strings.Builder{}
	table := tablewriter.NewWriter(tableString)

	if !conf.NoHeaders {
		table.SetHeader(data.headers)
	}

	table.AppendBulk(data.entries)

	table.SetAutoWrapText(false)
	table.SetAutoFormatHeaders(true)
	table.SetHeaderAlignment(tablewriter.ALIGN_LEFT)
	table.SetAlignment(tablewriter.ALIGN_LEFT)
	table.SetCenterSeparator("")
	table.SetColumnSeparator("")
	table.SetRowSeparator("")
	table.SetHeaderLine(false)
	table.SetBorder(false)
	table.SetNoWhiteSpace(true)

	if !conf.UseHighlight {
		// the tabs destroy the highlighting
		table.SetTablePadding("\t") // pad with tabs
	} else {
		table.SetTablePadding("   ")
	}

	table.Render()
	output(writer, color.Sprint(colorizeData(conf, tableString.String())))
}

/*
We simulate the \x command of psql (the PostgreSQL client)
*/
func printExtendedData(writer io.Writer, conf cfg.Config, data *Tabdata) {
	// needed for data output
	format := fmt.Sprintf("%%%ds: %%s\n", data.maxwidthHeader)
	out := ""

	if len(data.entries) > 0 {
		for _, entry := range data.entries {
			for i, value := range entry {
				out += color.Sprintf(format, data.headers[i], value)
			}

			out += "\n"
		}
	}

	output(writer, colorizeData(conf, out))
}

/*
Shell output, ready to be eval'd. Just like FreeBSD stat(1)
*/
func printShellData(writer io.Writer, data *Tabdata) {
	out := ""

	if len(data.entries) > 0 {
		for _, entry := range data.entries {
			shentries := []string{}

			for idx, value := range entry {
				shentries = append(shentries, fmt.Sprintf("%s=\"%s\"",
					data.headers[idx], value))
			}

			out += strings.Join(shentries, " ") + "\n"
		}
	}

	// no colorization here
	output(writer, out)
}

func printYamlData(writer io.Writer, data *Tabdata) {
	type Data struct {
		Entries []map[string]interface{} `yaml:"entries"`
	}

	yamlout := Data{}

	for _, entry := range data.entries {
		yamldata := map[string]interface{}{}

		for idx, entry := range entry {
			style := yaml.TaggedStyle

			_, err := strconv.Atoi(entry)
			if err != nil {
				style = yaml.DoubleQuotedStyle
			}

			yamldata[strings.ToLower(data.headers[idx])] =
				&yaml.Node{
					Kind:  yaml.ScalarNode,
					Style: style,
					Value: entry}
		}

		yamlout.Entries = append(yamlout.Entries, yamldata)
	}

	yamlstr, err := yaml.Marshal(&yamlout)

	if err != nil {
		log.Fatal(err)
	}

	output(writer, string(yamlstr))
}

func printCSVData(writer io.Writer, data *Tabdata) {
	csvout := csv.NewWriter(writer)

	if err := csvout.Write(data.headers); err != nil {
		log.Fatalln("error writing record to csv:", err)
	}

	for _, entry := range data.entries {
		if err := csvout.Write(entry); err != nil {
			log.Fatalln("error writing record to csv:", err)
		}
	}

	csvout.Flush()

	if err := csvout.Error(); err != nil {
		log.Fatal(err)
	}
}