112 lines
2.9 KiB
Go
112 lines
2.9 KiB
Go
/* SHS: Syntactically Homogeneous Shell
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* Copyright (C) 2019 Aidan Hahn
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package main
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import (
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"os"
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"fmt"
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"bufio"
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"strings"
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"strconv"
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"git.callpipe.com/aidan/shs/ast"
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"git.callpipe.com/aidan/shs/log"
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"git.callpipe.com/aidan/shs/stdlib"
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)
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const (
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def_prompt string = "λ"
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)
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func setLogLvl() {
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loglvl := os.Getenv("SH_LOGGING")
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if loglvl != "" {
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llvl, err := strconv.ParseInt(loglvl, 10, 8)
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if err != nil {
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log.Log(log.ERR,
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"couldnt parse log level: " + err.Error(),
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"init")
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} else {
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log.SetLogLvl(llvl)
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}
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}
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}
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func main() {
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debug := os.Getenv("SH_DEBUG_MODE")
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hist := os.Getenv("SH_HIST_FILE")
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prompt := os.Getenv("SHS_SH_PROMPT")
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var vars ast.VarTable
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var funcs ast.FuncTable
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funcs = stdlib.GenFuncTable()
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vars = &map[string]*ast.Token{}
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useHist := false
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var histFile *os.File
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var err error
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if hist != "" {
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useHist = true
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histFile, err = os.OpenFile(hist, os.O_RDWR|os.O_CREATE, 0755)
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if err != nil {
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useHist = false
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log.Log(log.ERR, "coudlnt open histfile: " + err.Error(), "init")
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}
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}
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if prompt == "" {
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prompt = def_prompt
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}
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// TODO: is bufio right for this?
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reader := bufio.NewReader(os.Stdin)
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for {
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setLogLvl()
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fmt.Print(prompt + " ")
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text, err := reader.ReadString('\n')
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if err != nil {
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log.Log(log.ERR, "couldnt read user input: " + err.Error(), "repl")
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}
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// TODO: replace with a regex
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text = strings.Replace(text, "\r\n", "", -1)
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text = strings.Replace(text, "\n", "", -1)
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if useHist {
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_, err = histFile.Write([]byte(text + "\n"))
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if err != nil {
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log.Log(log.DEBUG, "couldnt write to histfile: " + err.Error(), "repl")
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}
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}
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userInput := ast.Lex(text)
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if userInput == nil {
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// errors handled in Lex
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// TODO: return an error instead
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continue
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}
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if debug != "" {
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ast.PrintSExprsIndividually(userInput)
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}
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result := userInput.Eval(funcs, vars)
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fmt.Println(result.String() + "\n")
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}
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}
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