integrated readline

cmd/repl.go

@@ -20,16 +20,15 @@ package main
 import (
     "os"
     "fmt"
-    "bufio"
-    "strings"
     "strconv"
+    "github.com/chzyer/readline"
     "git.callpipe.com/aidan/shs/ast"
     "git.callpipe.com/aidan/shs/log"
     "git.callpipe.com/aidan/shs/stdlib"
 )
 
 const (
-    def_prompt  string = "λ"
+    def_prompt  string = "λ "
 )
 
 func setLogLvl() {
@@ -59,44 +58,31 @@ func main() {
     ast.InitVarTable(vars)
     ast.SyncTablesWithOSEnviron = true
 
-    useHist := false
-    var histFile *os.File
     var err error
 
-    if hist != "" {
-        useHist = true
-        histFile, err = os.OpenFile(hist, os.O_RDWR|os.O_CREATE, 0755)
-        if err != nil {
-            useHist = false
-            log.Log(log.ERR, "coudlnt open histfile: " + err.Error(), "init")
-        }
-    }
-
     if prompt == "" {
         prompt = def_prompt
     }
 
-    // TODO: is bufio right for this?
-    reader := bufio.NewReader(os.Stdin)
+    rl, err := readline.NewEx(&readline.Config{
+        Prompt: prompt,
+        HistoryFile: hist,
+        InterruptPrompt: "^C",
+    })
+
+    defer rl.Close()
+    if err != nil {
+        log.Log(log.ERR, "Couldnt initialize readline: " + err.Error(), "repl")
+        return
+    }
+
     for {
         setLogLvl()
-        fmt.Print(prompt + " ")
-        text, err := reader.ReadString('\n')
+        text, err := rl.Readline()
         if err != nil {
             log.Log(log.ERR, "couldnt read user input: " + err.Error(), "repl")
         }
 
-        // TODO: replace with a regex
-        text = strings.Replace(text, "\r\n", "", -1)
-        text = strings.Replace(text, "\n", "", -1)
-
-        if useHist {
-            _, err  = histFile.Write([]byte(text + "\n"))
-            if err != nil {
-                log.Log(log.DEBUG, "couldnt write to histfile: " + err.Error(), "repl")
-            }
-        }
-
         userInput := ast.Lex(text)
         if userInput == nil {
             // errors handled in Lex