From a2c4c99af4e33ff08b77023f1dd61cfb28ae9b02 Mon Sep 17 00:00:00 2001
From: lawl <github@dumbinter.net>
Date: Sat, 5 Jun 2021 19:59:47 +0200
Subject: [PATCH] WIP: implement reverse search

---
 go.mod     |  2 +-
 history.go | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 main.go    | 11 ++++++--
 3 files changed, 87 insertions(+), 3 deletions(-)
 create mode 100644 history.go

diff --git a/go.mod b/go.mod
index 931bcd0..f15853b 100644
--- a/go.mod
+++ b/go.mod
@@ -3,7 +3,7 @@ module hs9001
 go 1.16
 
 require (
-	github.com/peterh/liner v1.2.1
+	github.com/peterh/liner v1.2.1 
 	github.com/tj/go-naturaldate v1.3.0
 	modernc.org/sqlite v1.10.0
 )
diff --git a/history.go b/history.go
new file mode 100644
index 0000000..e5d4824
--- /dev/null
+++ b/history.go
@@ -0,0 +1,77 @@
+package main
+
+import (
+	"database/sql"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"strings"
+	"time"
+
+	"github.com/tj/go-naturaldate"
+)
+
+type history struct {
+	conn *sql.DB
+}
+
+func (h *history) GetHistoryByPrefix(prefix string) (ph []string) {
+	beginTimestamp, err := naturaldate.Parse("50 years ago", time.Now())
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to convert time string: %s\n", err.Error())
+	}
+	endTimeStamp, err := naturaldate.Parse("now", time.Now())
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to convert time string: %s\n", err.Error())
+	}
+	results := search(h.conn, prefix+"%", "%", beginTimestamp, endTimeStamp, -9001)
+	for e := results.Front(); e != nil; e = e.Next() {
+		entry, ok := e.Value.(*HistoryEntry)
+		if !ok {
+			log.Panic("Failed to retrieve entries")
+		}
+		ph = append(ph, entry.cmd)
+	}
+	return
+}
+func (h *history) GetHistoryByPattern(pattern string) (ph []string, pos []int) {
+	beginTimestamp, err := naturaldate.Parse("50 years ago", time.Now())
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to convert time string: %s\n", err.Error())
+	}
+	endTimeStamp, err := naturaldate.Parse("now", time.Now())
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "Failed to convert time string: %s\n", err.Error())
+	}
+	results := search(h.conn, "%"+pattern+"%", "%", beginTimestamp, endTimeStamp, -9001)
+	for e := results.Front(); e != nil; e = e.Next() {
+		entry, ok := e.Value.(*HistoryEntry)
+		if !ok {
+			log.Panic("Failed to retrieve entries")
+		}
+		//mt.Printf("\nAppending: [%s] %s -- %d\n", pattern, entry.cmd, strings.Index(entry.cmd, pattern))
+		ph = append(ph, entry.cmd)
+		pos = append(pos, strings.Index(strings.ToLower(entry.cmd), strings.ToLower(pattern)))
+	}
+	return
+}
+
+func (h *history) ReadHistory(r io.Reader) (num int, err error) {
+	panic("not implemented")
+}
+func (h *history) WriteHistory(w io.Writer) (num int, err error) {
+	panic("not implemented")
+}
+func (h *history) AppendHistory(item string) {
+	panic("not implemented")
+}
+func (h *history) ClearHistory() {
+	panic("not implemented")
+}
+func (h *history) RLock() {
+	//noop
+}
+func (h *history) RUnlock() {
+	//noop
+}
diff --git a/main.go b/main.go
index bd8a42d..bb796df 100644
--- a/main.go
+++ b/main.go
@@ -10,6 +10,7 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"strconv"
 	"strings"
 	"time"
 
@@ -271,6 +272,7 @@ func main() {
 		line := liner.NewLiner()
 		defer line.Close()
 		line.SetCtrlCAborts(true)
+		line.SetHistoryProvider(&history{conn: conn})
 		line.SetCompleter(func(line string) (c []string) {
 			beginTimestamp, err := naturaldate.Parse("50 years ago", time.Now())
 			if err != nil {
@@ -291,14 +293,19 @@ func main() {
 			return
 		})
 
-		if name, err := line.Prompt("What is your command? "); err == nil {
-			log.Print("Got: ", name)
+		rdlineline := os.Getenv("READLINE_LINE")
+		rdlinepos := os.Getenv("READLINE_POS")
+		rdlineposint, _ := strconv.Atoi(rdlinepos)
+
+		if name, err := line.PromptWithSuggestionReverse("", rdlineline, rdlineposint); err == nil {
+			fmt.Fprintf(os.Stderr, "%s\n", name)
 		}
 
 	case "bash-enable":
 		fmt.Printf(`
 			if [ -n "$PS1" ] ; then
 				PROMPT_COMMAND='hs9001 add -ret $? "$(history 1)"'
+				bind -x '"\C-r": " READLINE_LINE=$(hs9001 bash-ctrlr 3>&1 1>&2 2>&3) READLINE_POINT=0"'
 			fi
 		`)
 	case "bash-disable":