cli add line noise support

cmd/ledis-cli/linenoise.go

@@ -0,0 +1,43 @@
+package main
+
+//#include <stdlib.h>
+//#include "linenoise.h"
+import "C"
+
+import (
+	"errors"
+	"unsafe"
+)
+
+func line(prompt string) (string, error) {
+	promptCString := C.CString(prompt)
+	resultCString := C.linenoise(promptCString)
+	C.free(unsafe.Pointer(promptCString))
+	defer C.free(unsafe.Pointer(resultCString))
+
+	if resultCString == nil {
+		return "", errors.New("quited by a signal")
+	}
+
+	result := C.GoString(resultCString)
+
+	return result, nil
+}
+
+func addHistory(line string) error {
+	lineCString := C.CString(line)
+	res := C.linenoiseHistoryAdd(lineCString)
+	C.free(unsafe.Pointer(lineCString))
+	if res != 1 {
+		return errors.New("Could not add line to history.")
+	}
+	return nil
+}
+
+func setHistoryCapacity(capacity int) error {
+	res := C.linenoiseHistorySetMaxLen(C.int(capacity))
+	if res != 1 {
+		return errors.New("Could not set history max len.")
+	}
+	return nil
+}

cmd/ledis-cli/linenoise.h

@@ -0,0 +1,66 @@
+/* linenoise.h -- guerrilla line editing library against the idea that a
+ * line editing lib needs to be 20,000 lines of C code.
+ *
+ * See linenoise.c for more information.
+ *
+ * ------------------------------------------------------------------------
+ *
+ * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ *
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * 
+ *  *  Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *
+ *  *  Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef __LINENOISE_H
+#define __LINENOISE_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct linenoiseCompletions {
+  size_t len;
+  char **cvec;
+} linenoiseCompletions;
+
+typedef void(linenoiseCompletionCallback)(const char *, linenoiseCompletions *);
+void linenoiseSetCompletionCallback(linenoiseCompletionCallback *);
+void linenoiseAddCompletion(linenoiseCompletions *, const char *);
+
+char *linenoise(const char *prompt);
+int linenoiseHistoryAdd(const char *line);
+int linenoiseHistorySetMaxLen(int len);
+int linenoiseHistorySave(const char *filename);
+int linenoiseHistoryLoad(const char *filename);
+void linenoiseClearScreen(void);
+void linenoiseSetMultiLine(int ml);
+void linenoisePrintKeyCodes(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __LINENOISE_H */

cmd/ledis-cli/main.go

@@ -1,11 +1,11 @@
 package main
 
 import (
-	"bufio"
+	//	"bufio"
 	"flag"
 	"fmt"
 	"github.com/siddontang/ledisdb/client/go/ledis"
-	"os"
+	//	"os"
 	"strings"
 )
 
@@ -27,17 +27,21 @@ func main() {
 
 	c := ledis.NewClient(cfg)
 
-	reader := bufio.NewReader(os.Stdin)
+	setHistoryCapacity(100)
 
 	for {
-		fmt.Printf("ledis %s > ", cfg.Addr)
-
-		cmd, _ := reader.ReadString('\n')
+		cmd, err := line(fmt.Sprintf("%s> ", cfg.Addr))
+		if err != nil {
+			fmt.Printf("%s\n", err.Error())
+			return
+		}
 
 		cmds := strings.Fields(cmd)
 		if len(cmds) == 0 {
 			continue
 		} else {
+			addHistory(cmd)
+
 			args := make([]interface{}, len(cmds[1:]))
 			for i := range args {
 				args[i] = strings.Trim(string(cmds[1+i]), "\"")