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/*******************************************************************************
*
* Copyright 2017 Stefan Majewsky <majewsky@gmx.net>
*
* 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 prompt
import (
"fmt"
"os"
"strings"
"golang.org/x/crypto/ssh/terminal"
"github.com/majewsky/gofu/pkg/cli"
)
//Exec executes the prettyprompt applet and returns an exit code (0 for
//success, >0 for error).
func Exec(args []string) int {
fields := []string{
getLoginField(),
}
cwd := CurrentDirectory()
fields = appendUnlessEmpty(fields, getDirectoryField(cwd))
fields = appendUnlessEmpty(fields, getDeletedMessageField(cwd))
fields = appendUnlessEmpty(fields, getRepoStatusField(cwd.Repo))
fields = appendUnlessEmpty(fields, getTerminalField())
fields = appendUnlessEmpty(fields, getOpenstackField())
fields = appendUnlessEmpty(fields, getKubernetesField())
//this field should always be last
if len(args) > 0 {
fields = appendUnlessEmpty(fields, getExitCodeField(args[0]))
}
line := strings.Join(fields, " ")
lineWidth := getPrintableLength(line)
//add dashes to expand `line` to fill the terminal's width
termWidth, _, err := terminal.GetSize(0)
if err != nil {
termWidth = 80
}
if termWidth > lineWidth {
line += " "
lineWidth++
}
if termWidth > lineWidth {
dashes := make([]byte, termWidth-lineWidth)
for idx := range dashes {
dashes[idx] = '-'
}
line += withColor("1", string(dashes))
}
os.Stdout.Write([]byte(line + "\n"))
//print second line: a letter identifying the shell, and the final "$ ")
shellIdent := ""
switch os.Getenv("PRETTYPROMPT_SHELL") {
case "zsh":
shellIdent = "Z"
case "bash":
shellIdent = "B"
}
os.Stdout.Write([]byte(shellIdent + "$ "))
return 0
}
func getenvOrDefault(key, defaultValue string) (value string) {
value = os.Getenv(key)
if value == "" {
value = defaultValue
}
return
}
func appendUnlessEmpty(list []string, val string) []string {
if val == "" {
return list
}
return append(list, val)
}
func handleError(err error) {
if err != nil {
os.Stderr.Write([]byte("\x1B[1;31mPrompt error: " + err.Error() + "\x1B[0m\n"))
}
}
func getPrintableLength(text string) int {
return len(cli.AnsiColorCodeRx.ReplaceAllString(text, ""))
}
//withColor adds ANSI escape sequences to the string to display it with a
//certain color. The color is given as the semicolon-separated list of
//arguments to the ANSI escape sequence SGR, e.g. "1;41" for bold with red
//background.
func withColor(color, text string) string {
if color == "0" {
return text
}
return fmt.Sprintf("\x1B[%sm%s\x1B[0m", color, text)
}
//withType adds a type annotation with a standardized format to the text.
func withType(typeStr, text string) string {
return fmt.Sprintf("\x1B[37m%s:\x1B[0m%s", typeStr, text)
}
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