Implement bash CTRL-R reverse history

Fork customized liner into own repo bash.
Rename -being and -end options to -after and -before.

go.mod

@@ -3,7 +3,7 @@ module hs9001
 go 1.16
 
 require (
-	github.com/peterh/liner v1.2.1
+	github.com/mattn/go-runewidth v0.0.13
 	github.com/tj/go-naturaldate v1.3.0
 	modernc.org/sqlite v1.10.0
 )

go.sum

@@ -8,16 +8,16 @@ github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51 h1:Z9n2FFNU
 github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51/go.mod h1:CzGEWj7cYgsdH8dAjBGEr58BoE7ScuLd+fwFZ44+/x8=
 github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
 github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
-github.com/mattn/go-runewidth v0.0.3 h1:a+kO+98RDGEfo6asOGMmpodZq4FNtnGP54yps8BzLR4=
-github.com/mattn/go-runewidth v0.0.3/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
+github.com/mattn/go-runewidth v0.0.13 h1:lTGmDsbAYt5DmK6OnoV7EuIF1wEIFAcxld6ypU4OSgU=
+github.com/mattn/go-runewidth v0.0.13/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
 github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg=
 github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU=
-github.com/peterh/liner v1.2.1 h1:O4BlKaq/LWu6VRWmol4ByWfzx6MfXc5Op5HETyIy5yg=
-github.com/peterh/liner v1.2.1/go.mod h1:CRroGNssyjTd/qIG2FyxByd2S8JEAZXBl4qUrZf8GS0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 h1:OdAsTTz6OkFY5QxjkYwrChwuRruF69c169dPK26NUlk=
 github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=
+github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=

history.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"database/sql"
+	"io"
+	"log"
+	"strings"
+)
+
+type history struct {
+	conn *sql.DB
+}
+
+func (h *history) GetHistoryByPrefix(prefix string) (ph []string) {
+	opts := searchopts{}
+	opts.order = "DESC"
+	cmdqry := prefix + "%"
+	opts.command = &cmdqry
+	results := search(h.conn, opts)
+	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) {
+	opts := searchopts{}
+	opts.order = "DESC"
+	cmdqry := "%" + pattern + "%"
+	opts.command = &cmdqry
+	results := search(h.conn, opts)
+	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)
+		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
+}

liner/LICENSE

@@ -0,0 +1,20 @@
+Copyright © 2012 Peter Harris
+
+Permission is hereby granted, free of charge, to any person obtaining a
+copy of this software and associated documentation files (the "Software"),
+to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense,
+and/or sell copies of the Software, and to permit persons to whom the
+Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.

liner/common.go

@@ -0,0 +1,196 @@
+/*
+Package liner implements a simple command line editor, inspired by linenoise
+(https://github.com/antirez/linenoise/). This package supports WIN32 in
+addition to the xterm codes supported by everything else.
+*/
+package liner
+
+import (
+	"bufio"
+	"container/ring"
+	"errors"
+	"fmt"
+	"io"
+)
+
+type commonState struct {
+	terminalSupported bool
+	outputRedirected  bool
+	inputRedirected   bool
+	historyProvider   HistoryProvider
+	completer         WordCompleter
+	columns           int
+	killRing          *ring.Ring
+	ctrlCAborts       bool
+	r                 *bufio.Reader
+	tabStyle          TabStyle
+	multiLineMode     bool
+	cursorRows        int
+	maxRows           int
+	shouldRestart     ShouldRestart
+	noBeep            bool
+	needRefresh       bool
+}
+
+type HistoryProvider interface {
+	ReadHistory(r io.Reader) (num int, err error)
+	WriteHistory(w io.Writer) (num int, err error)
+	AppendHistory(item string)
+	ClearHistory()
+	GetHistoryByPrefix(prefix string) (ph []string)
+	GetHistoryByPattern(pattern string) (ph []string, pos []int)
+	RLock()
+	RUnlock()
+}
+
+// TabStyle is used to select how tab completions are displayed.
+type TabStyle int
+
+// Two tab styles are currently available:
+//
+// TabCircular cycles through each completion item and displays it directly on
+// the prompt
+//
+// TabPrints prints the list of completion items to the screen after a second
+// tab key is pressed. This behaves similar to GNU readline and BASH (which
+// uses readline)
+const (
+	TabCircular TabStyle = iota
+	TabPrints
+)
+
+// ErrPromptAborted is returned from Prompt or PasswordPrompt when the user presses Ctrl-C
+// if SetCtrlCAborts(true) has been called on the State
+var ErrPromptAborted = errors.New("prompt aborted")
+
+// ErrNotTerminalOutput is returned from Prompt or PasswordPrompt if the
+// platform is normally supported, but stdout has been redirected
+var ErrNotTerminalOutput = errors.New("standard output is not a terminal")
+
+// ErrInvalidPrompt is returned from Prompt or PasswordPrompt if the
+// prompt contains any unprintable runes (including substrings that could
+// be colour codes on some platforms).
+var ErrInvalidPrompt = errors.New("invalid prompt")
+
+// ErrInternal is returned when liner experiences an error that it cannot
+// handle. For example, if the number of colums becomes zero during an
+// active call to Prompt
+var ErrInternal = errors.New("liner: internal error")
+
+// KillRingMax is the max number of elements to save on the killring.
+const KillRingMax = 60
+
+// HistoryLimit is the maximum number of entries saved in the scrollback history.
+const HistoryLimit = 1000
+
+func (s *State) ReadHistory(r io.Reader) (num int, err error) {
+	return s.historyProvider.ReadHistory(r)
+}
+func (s *State) WriteHistory(w io.Writer) (num int, err error) {
+	return s.historyProvider.WriteHistory(w)
+}
+func (s *State) AppendHistory(item string) {
+	s.historyProvider.AppendHistory(item)
+}
+func (s *State) ClearHistory() {
+	s.historyProvider.ClearHistory()
+}
+func (s *State) getHistoryByPrefix(prefix string) (ph []string) {
+	return s.historyProvider.GetHistoryByPrefix(prefix)
+}
+func (s *State) getHistoryByPattern(pattern string) (ph []string, pos []int) {
+	return s.historyProvider.GetHistoryByPattern(pattern)
+}
+
+// SetHistoryProvider allows you to set a custom provider
+// for reading, writing and searching history.
+// By implementing the HistoryProvider interface
+// and injecting your custom implementation here.
+func (s *State) SetHistoryProvider(f HistoryProvider) {
+	s.historyProvider = f
+}
+
+// Completer takes the currently edited line content at the left of the cursor
+// and returns a list of completion candidates.
+// If the line is "Hello, wo!!!" and the cursor is before the first '!', "Hello, wo" is passed
+// to the completer which may return {"Hello, world", "Hello, Word"} to have "Hello, world!!!".
+type Completer func(line string) []string
+
+// WordCompleter takes the currently edited line with the cursor position and
+// returns the completion candidates for the partial word to be completed.
+// If the line is "Hello, wo!!!" and the cursor is before the first '!', ("Hello, wo!!!", 9) is passed
+// to the completer which may returns ("Hello, ", {"world", "Word"}, "!!!") to have "Hello, world!!!".
+type WordCompleter func(line string, pos int) (head string, completions []string, tail string)
+
+// SetCompleter sets the completion function that Liner will call to
+// fetch completion candidates when the user presses tab.
+func (s *State) SetCompleter(f Completer) {
+	if f == nil {
+		s.completer = nil
+		return
+	}
+	s.completer = func(line string, pos int) (string, []string, string) {
+		return "", f(string([]rune(line)[:pos])), string([]rune(line)[pos:])
+	}
+}
+
+// SetWordCompleter sets the completion function that Liner will call to
+// fetch completion candidates when the user presses tab.
+func (s *State) SetWordCompleter(f WordCompleter) {
+	s.completer = f
+}
+
+// SetTabCompletionStyle sets the behvavior when the Tab key is pressed
+// for auto-completion.  TabCircular is the default behavior and cycles
+// through the list of candidates at the prompt.  TabPrints will print
+// the available completion candidates to the screen similar to BASH
+// and GNU Readline
+func (s *State) SetTabCompletionStyle(tabStyle TabStyle) {
+	s.tabStyle = tabStyle
+}
+
+// ModeApplier is the interface that wraps a representation of the terminal
+// mode. ApplyMode sets the terminal to this mode.
+type ModeApplier interface {
+	ApplyMode() error
+}
+
+// SetCtrlCAborts sets whether Prompt on a supported terminal will return an
+// ErrPromptAborted when Ctrl-C is pressed. The default is false (will not
+// return when Ctrl-C is pressed). Unsupported terminals typically raise SIGINT
+// (and Prompt does not return) regardless of the value passed to SetCtrlCAborts.
+func (s *State) SetCtrlCAborts(aborts bool) {
+	s.ctrlCAborts = aborts
+}
+
+// SetMultiLineMode sets whether line is auto-wrapped. The default is false (single line).
+func (s *State) SetMultiLineMode(mlmode bool) {
+	s.multiLineMode = mlmode
+}
+
+// ShouldRestart is passed the error generated by readNext and returns true if
+// the the read should be restarted or false if the error should be returned.
+type ShouldRestart func(err error) bool
+
+// SetShouldRestart sets the restart function that Liner will call to determine
+// whether to retry the call to, or return the error returned by, readNext.
+func (s *State) SetShouldRestart(f ShouldRestart) {
+	s.shouldRestart = f
+}
+
+// SetBeep sets whether liner should beep the terminal at various times (output
+// ASCII BEL, 0x07). Default is true (will beep).
+func (s *State) SetBeep(beep bool) {
+	s.noBeep = !beep
+}
+
+func (s *State) promptUnsupported(p string) (string, error) {
+	if !s.inputRedirected || !s.terminalSupported {
+		fmt.Print(p)
+	}
+	linebuf, _, err := s.r.ReadLine()
+	if err != nil {
+		return "", err
+	}
+	return string(linebuf), nil
+}

liner/input.go

@@ -0,0 +1,391 @@
+package liner
+
+import (
+	"bufio"
+	"errors"
+	"os"
+	"os/signal"
+	"strconv"
+	"strings"
+	"syscall"
+	"time"
+)
+
+type nexter struct {
+	r   rune
+	err error
+}
+
+// State represents an open terminal
+type State struct {
+	commonState
+	origMode    termios
+	defaultMode termios
+	next        <-chan nexter
+	winch       chan os.Signal
+	pending     []rune
+	useCHA      bool
+}
+
+// NewLiner initializes a new *State, and sets the terminal into raw mode. To
+// restore the terminal to its previous state, call State.Close().
+func NewLiner() *State {
+	var s State
+	s.r = bufio.NewReader(os.Stdin)
+
+	s.terminalSupported = TerminalSupported()
+	if m, err := TerminalMode(); err == nil {
+		s.origMode = *m.(*termios)
+	} else {
+		s.inputRedirected = true
+	}
+	if _, err := getMode(syscall.Stdout); err != 0 {
+		s.outputRedirected = true
+	}
+	if s.inputRedirected && s.outputRedirected {
+		s.terminalSupported = false
+	}
+	if s.terminalSupported && !s.inputRedirected && !s.outputRedirected {
+		mode := s.origMode
+		mode.Iflag &^= icrnl | inpck | istrip | ixon
+		mode.Cflag |= cs8
+		mode.Lflag &^= syscall.ECHO | icanon | iexten
+		mode.ApplyMode()
+
+		winch := make(chan os.Signal, 1)
+		signal.Notify(winch, syscall.SIGWINCH)
+		s.winch = winch
+
+		s.checkOutput()
+	}
+
+	if !s.outputRedirected {
+		s.outputRedirected = !s.getColumns()
+	}
+
+	return &s
+}
+
+var errTimedOut = errors.New("timeout")
+
+func (s *State) startPrompt() {
+	if s.terminalSupported {
+		if m, err := TerminalMode(); err == nil {
+			s.defaultMode = *m.(*termios)
+			mode := s.defaultMode
+			mode.Lflag &^= isig
+			mode.ApplyMode()
+		}
+	}
+	s.restartPrompt()
+}
+
+func (s *State) inputWaiting() bool {
+	return len(s.next) > 0
+}
+
+func (s *State) restartPrompt() {
+	next := make(chan nexter, 200)
+	go func() {
+		for {
+			var n nexter
+			n.r, _, n.err = s.r.ReadRune()
+			next <- n
+			// Shut down nexter loop when an end condition has been reached
+			if n.err != nil || n.r == '\n' || n.r == '\r' || n.r == ctrlC || n.r == ctrlD {
+				close(next)
+				return
+			}
+		}
+	}()
+	s.next = next
+}
+
+func (s *State) stopPrompt() {
+	if s.terminalSupported {
+		s.defaultMode.ApplyMode()
+	}
+}
+
+func (s *State) nextPending(timeout <-chan time.Time) (rune, error) {
+	select {
+	case thing, ok := <-s.next:
+		if !ok {
+			return 0, ErrInternal
+		}
+		if thing.err != nil {
+			return 0, thing.err
+		}
+		s.pending = append(s.pending, thing.r)
+		return thing.r, nil
+	case <-timeout:
+		rv := s.pending[0]
+		s.pending = s.pending[1:]
+		return rv, errTimedOut
+	}
+}
+
+func (s *State) readNext() (interface{}, error) {
+	if len(s.pending) > 0 {
+		rv := s.pending[0]
+		s.pending = s.pending[1:]
+		return rv, nil
+	}
+	var r rune
+	select {
+	case thing, ok := <-s.next:
+		if !ok {
+			return 0, ErrInternal
+		}
+		if thing.err != nil {
+			return nil, thing.err
+		}
+		r = thing.r
+	case <-s.winch:
+		s.getColumns()
+		return winch, nil
+	}
+	if r != esc {
+		return r, nil
+	}
+	s.pending = append(s.pending, r)
+
+	// Wait at most 50 ms for the rest of the escape sequence
+	// If nothing else arrives, it was an actual press of the esc key
+	timeout := time.After(50 * time.Millisecond)
+	flag, err := s.nextPending(timeout)
+	if err != nil {
+		if err == errTimedOut {
+			return flag, nil
+		}
+		return unknown, err
+	}
+
+	switch flag {
+	case '[':
+		code, err := s.nextPending(timeout)
+		if err != nil {
+			if err == errTimedOut {
+				return code, nil
+			}
+			return unknown, err
+		}
+		switch code {
+		case 'A':
+			s.pending = s.pending[:0] // escape code complete
+			return up, nil
+		case 'B':
+			s.pending = s.pending[:0] // escape code complete
+			return down, nil
+		case 'C':
+			s.pending = s.pending[:0] // escape code complete
+			return right, nil
+		case 'D':
+			s.pending = s.pending[:0] // escape code complete
+			return left, nil
+		case 'F':
+			s.pending = s.pending[:0] // escape code complete
+			return end, nil
+		case 'H':
+			s.pending = s.pending[:0] // escape code complete
+			return home, nil
+		case 'Z':
+			s.pending = s.pending[:0] // escape code complete
+			return shiftTab, nil
+		case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+			num := []rune{code}
+			for {
+				code, err := s.nextPending(timeout)
+				if err != nil {
+					if err == errTimedOut {
+						return code, nil
+					}
+					return nil, err
+				}
+				switch code {
+				case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+					num = append(num, code)
+				case ';':
+					// Modifier code to follow
+					// This only supports Ctrl-left and Ctrl-right for now
+					x, _ := strconv.ParseInt(string(num), 10, 32)
+					if x != 1 {
+						// Can't be left or right
+						rv := s.pending[0]
+						s.pending = s.pending[1:]
+						return rv, nil
+					}
+					num = num[:0]
+					for {
+						code, err = s.nextPending(timeout)
+						if err != nil {
+							if err == errTimedOut {
+								rv := s.pending[0]
+								s.pending = s.pending[1:]
+								return rv, nil
+							}
+							return nil, err
+						}
+						switch code {
+						case '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
+							num = append(num, code)
+						case 'C', 'D':
+							// right, left
+							mod, _ := strconv.ParseInt(string(num), 10, 32)
+							if mod != 5 {
+								// Not bare Ctrl
+								rv := s.pending[0]
+								s.pending = s.pending[1:]
+								return rv, nil
+							}
+							s.pending = s.pending[:0] // escape code complete
+							if code == 'C' {
+								return wordRight, nil
+							}
+							return wordLeft, nil
+						default:
+							// Not left or right
+							rv := s.pending[0]
+							s.pending = s.pending[1:]
+							return rv, nil
+						}
+					}
+				case '~':
+					s.pending = s.pending[:0] // escape code complete
+					x, _ := strconv.ParseInt(string(num), 10, 32)
+					switch x {
+					case 2:
+						return insert, nil
+					case 3:
+						return del, nil
+					case 5:
+						return pageUp, nil
+					case 6:
+						return pageDown, nil
+					case 1, 7:
+						return home, nil
+					case 4, 8:
+						return end, nil
+					case 15:
+						return f5, nil
+					case 17:
+						return f6, nil
+					case 18:
+						return f7, nil
+					case 19:
+						return f8, nil
+					case 20:
+						return f9, nil
+					case 21:
+						return f10, nil
+					case 23:
+						return f11, nil
+					case 24:
+						return f12, nil
+					default:
+						return unknown, nil
+					}
+				default:
+					// unrecognized escape code
+					rv := s.pending[0]
+					s.pending = s.pending[1:]
+					return rv, nil
+				}
+			}
+		}
+
+	case 'O':
+		code, err := s.nextPending(timeout)
+		if err != nil {
+			if err == errTimedOut {
+				return code, nil
+			}
+			return nil, err
+		}
+		s.pending = s.pending[:0] // escape code complete
+		switch code {
+		case 'c':
+			return wordRight, nil
+		case 'd':
+			return wordLeft, nil
+		case 'H':
+			return home, nil
+		case 'F':
+			return end, nil
+		case 'P':
+			return f1, nil
+		case 'Q':
+			return f2, nil
+		case 'R':
+			return f3, nil
+		case 'S':
+			return f4, nil
+		default:
+			return unknown, nil
+		}
+	case 'b':
+		s.pending = s.pending[:0] // escape code complete
+		return altB, nil
+	case 'd':
+		s.pending = s.pending[:0] // escape code complete
+		return altD, nil
+	case bs:
+		s.pending = s.pending[:0] // escape code complete
+		return altBs, nil
+	case 'f':
+		s.pending = s.pending[:0] // escape code complete
+		return altF, nil
+	case 'y':
+		s.pending = s.pending[:0] // escape code complete
+		return altY, nil
+	default:
+		rv := s.pending[0]
+		s.pending = s.pending[1:]
+		return rv, nil
+	}
+
+	// not reached
+	return r, nil
+}
+
+// Close returns the terminal to its previous mode
+func (s *State) Close() error {
+	signal.Stop(s.winch)
+	if !s.inputRedirected {
+		s.origMode.ApplyMode()
+	}
+	return nil
+}
+
+// TerminalSupported returns true if the current terminal supports
+// line editing features, and false if liner will use the 'dumb'
+// fallback for input.
+// Note that TerminalSupported does not check all factors that may
+// cause liner to not fully support the terminal (such as stdin redirection)
+func TerminalSupported() bool {
+	bad := map[string]bool{"": true, "dumb": true, "cons25": true}
+	return !bad[strings.ToLower(os.Getenv("TERM"))]
+}
+
+const (
+	getTermios = syscall.TCGETS
+	setTermios = syscall.TCSETS
+)
+
+const (
+	icrnl  = syscall.ICRNL
+	inpck  = syscall.INPCK
+	istrip = syscall.ISTRIP
+	ixon   = syscall.IXON
+	opost  = syscall.OPOST
+	cs8    = syscall.CS8
+	isig   = syscall.ISIG
+	icanon = syscall.ICANON
+	iexten = syscall.IEXTEN
+)
+
+type termios struct {
+	syscall.Termios
+}
+
+const cursorColumn = false

liner/output.go

@@ -0,0 +1,74 @@
+package liner
+
+import (
+	"fmt"
+	"os"
+	"strings"
+	"syscall"
+	"unsafe"
+)
+
+func (s *State) cursorPos(x int) {
+	if s.useCHA {
+		// 'G' is "Cursor Character Absolute (CHA)"
+		fmt.Printf("\x1b[%dG", x+1)
+	} else {
+		// 'C' is "Cursor Forward (CUF)"
+		fmt.Print("\r")
+		if x > 0 {
+			fmt.Printf("\x1b[%dC", x)
+		}
+	}
+}
+
+func (s *State) eraseLine() {
+	fmt.Print("\x1b[0K")
+}
+
+func (s *State) eraseScreen() {
+	fmt.Print("\x1b[H\x1b[2J")
+}
+
+func (s *State) moveUp(lines int) {
+	fmt.Printf("\x1b[%dA", lines)
+}
+
+func (s *State) moveDown(lines int) {
+	fmt.Printf("\x1b[%dB", lines)
+}
+
+func (s *State) emitNewLine() {
+	fmt.Print("\n")
+}
+
+type winSize struct {
+	row, col       uint16
+	xpixel, ypixel uint16
+}
+
+func (s *State) getColumns() bool {
+	var ws winSize
+	ok, _, _ := syscall.Syscall(syscall.SYS_IOCTL, uintptr(syscall.Stdout),
+		syscall.TIOCGWINSZ, uintptr(unsafe.Pointer(&ws)))
+	if int(ok) < 0 {
+		return false
+	}
+	s.columns = int(ws.col)
+	return true
+}
+
+func (s *State) checkOutput() {
+	// xterm is known to support CHA
+	if strings.Contains(strings.ToLower(os.Getenv("TERM")), "xterm") {
+		s.useCHA = true
+		return
+	}
+
+	// The test for functional ANSI CHA is unreliable (eg the Windows
+	// telnet command does not support reading the cursor position with
+	// an ANSI DSR request, despite setting TERM=ansi)
+
+	// Assume CHA isn't supported (which should be safe, although it
+	// does result in occasional visible cursor jitter)
+	s.useCHA = false
+}

liner/unixmode.go

@@ -0,0 +1,35 @@
+package liner
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func (mode *termios) ApplyMode() error {
+	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(syscall.Stdin), setTermios, uintptr(unsafe.Pointer(mode)))
+
+	if errno != 0 {
+		return errno
+	}
+	return nil
+}
+
+// TerminalMode returns the current terminal input mode as an InputModeSetter.
+//
+// This function is provided for convenience, and should
+// not be necessary for most users of liner.
+func TerminalMode() (ModeApplier, error) {
+	mode, errno := getMode(syscall.Stdin)
+
+	if errno != 0 {
+		return nil, errno
+	}
+	return mode, nil
+}
+
+func getMode(handle int) (*termios, syscall.Errno) {
+	var mode termios
+	_, _, errno := syscall.Syscall(syscall.SYS_IOCTL, uintptr(handle), getTermios, uintptr(unsafe.Pointer(&mode)))
+
+	return &mode, errno
+}

liner/width.go

@@ -0,0 +1,90 @@
+package liner
+
+import (
+	"unicode"
+
+	"github.com/mattn/go-runewidth"
+)
+
+// These character classes are mostly zero width (when combined).
+// A few might not be, depending on the user's font. Fixing this
+// is non-trivial, given that some terminals don't support
+// ANSI DSR/CPR
+var zeroWidth = []*unicode.RangeTable{
+	unicode.Mn,
+	unicode.Me,
+	unicode.Cc,
+	unicode.Cf,
+}
+
+// countGlyphs considers zero-width characters to be zero glyphs wide,
+// and members of Chinese, Japanese, and Korean scripts to be 2 glyphs wide.
+func countGlyphs(s []rune) int {
+	n := 0
+	for _, r := range s {
+		// speed up the common case
+		if r < 127 {
+			n++
+			continue
+		}
+
+		n += runewidth.RuneWidth(r)
+	}
+	return n
+}
+
+func countMultiLineGlyphs(s []rune, columns int, start int) int {
+	n := start
+	for _, r := range s {
+		if r < 127 {
+			n++
+			continue
+		}
+		switch runewidth.RuneWidth(r) {
+		case 0:
+		case 1:
+			n++
+		case 2:
+			n += 2
+			// no room for a 2-glyphs-wide char in the ending
+			// so skip a column and display it at the beginning
+			if n%columns == 1 {
+				n++
+			}
+		}
+	}
+	return n
+}
+
+func getPrefixGlyphs(s []rune, num int) []rune {
+	p := 0
+	for n := 0; n < num && p < len(s); p++ {
+		// speed up the common case
+		if s[p] < 127 {
+			n++
+			continue
+		}
+		if !unicode.IsOneOf(zeroWidth, s[p]) {
+			n++
+		}
+	}
+	for p < len(s) && unicode.IsOneOf(zeroWidth, s[p]) {
+		p++
+	}
+	return s[:p]
+}
+
+func getSuffixGlyphs(s []rune, num int) []rune {
+	p := len(s)
+	for n := 0; n < num && p > 0; p-- {
+		// speed up the common case
+		if s[p-1] < 127 {
+			n++
+			continue
+		}
+		if !unicode.IsOneOf(zeroWidth, s[p-1]) {
+			n++
+		}
+	}
+	return s[p:]
+}

main.go

@@ -10,10 +10,12 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"strconv"
 	"strings"
 	"time"
 
-	"github.com/peterh/liner"
+	"hs9001/liner"
+
 	"github.com/tj/go-naturaldate"
 	_ "modernc.org/sqlite"
 )
@@ -149,28 +151,47 @@ func importFromStdin(conn *sql.DB) {
 	}
 }
 
-func search(conn *sql.DB, q string, workdir string, beginTime time.Time, endTime time.Time, retval int) list.List {
+type searchopts struct {
+	command *string
+	workdir *string
+	after   *time.Time
+	before  *time.Time
+	retval  *int
+	order   string
+}
+
+func search(conn *sql.DB, opts searchopts) list.List {
+	args := make([]interface{}, 0)
 	var sb strings.Builder
 	sb.WriteString("SELECT id, command, workdir, user, hostname, retval ")
 	sb.WriteString("FROM history ")
-	sb.WriteString("WHERE timestamp BETWEEN datetime(?, 'unixepoch') ")
-	sb.WriteString("AND datetime(?, 'unixepoch') ")
+	sb.WriteString("WHERE 1=1 ") //1=1 so we can append as many AND foo as we want, or none
+
+	if opts.command != nil {
 		sb.WriteString("AND command LIKE ? ")
-	sb.WriteString("AND workdir LIKE ? ")
-	if retval != -9001 {
-		sb.WriteString("AND retval = ? ")
+		args = append(args, opts.command)
 	}
-	sb.WriteString("ORDER BY timestamp ASC ")
+	if opts.workdir != nil {
+		sb.WriteString("AND workdir LIKE ? ")
+		args = append(args, opts.workdir)
+	}
+	if opts.after != nil {
+		sb.WriteString("AND timestamp > datetime(?, 'unixepoch') ")
+		args = append(args, opts.after.Unix())
+	}
+	if opts.before != nil {
+		sb.WriteString("AND timestamp < datetime(?, 'unixepoch') ")
+		args = append(args, opts.before.Unix())
+	}
+	if opts.retval != nil {
+		sb.WriteString("AND retval = ? ")
+		args = append(args, opts.retval)
+	}
+	sb.WriteString("ORDER BY timestamp ")
+	sb.WriteString("ASC ")
 
 	queryStmt := sb.String()
-	args := make([]interface{}, 0)
-	args = append(args, beginTime.Unix())
-	args = append(args, endTime.Unix())
-	args = append(args, q)
-	args = append(args, workdir)
-	if retval != -9001 {
-		args = append(args, retval)
-	}
+
 	rows, err := conn.Query(queryStmt, args...)
 	if err != nil {
 		log.Panic(err)
@@ -271,34 +292,22 @@ func main() {
 		line := liner.NewLiner()
 		defer line.Close()
 		line.SetCtrlCAborts(true)
-		line.SetCompleter(func(line string) (c []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(conn, "%"+line+"%", "%", 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")
-				}
-				c = append(c, entry.cmd)
-			}
-			return
-		})
+		line.SetHistoryProvider(&history{conn: conn})
+		line.SetMultiLineMode(true)
 
-		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":
@@ -326,13 +335,13 @@ func main() {
 		fallthrough
 	case "delete":
 		var workDir string
-		var beginTime string
-		var endTime string
+		var afterTime string
+		var beforeTime string
 		var distinct bool = true
 		var retVal int
-		searchCmd.StringVar(&workDir, "cwd", "%", "Search only within this workdir")
-		searchCmd.StringVar(&beginTime, "begin", "50 years ago", "Start searching from this timeframe")
-		searchCmd.StringVar(&endTime, "end", "now", "End searching from this timeframe")
+		searchCmd.StringVar(&workDir, "cwd", "", "Search only within this workdir")
+		searchCmd.StringVar(&afterTime, "after", "", "Start searching from this timeframe")
+		searchCmd.StringVar(&beforeTime, "before", "", "End searching from this timeframe")
 		searchCmd.BoolVar(&distinct, "distinct", true, "Remove consecutive duplicate commands from output")
 		searchCmd.IntVar(&retVal, "ret", -9001, "Only query commands that returned with this exit code. -9001=all (default)")
 
@@ -340,25 +349,39 @@ func main() {
 
 		args := searchCmd.Args()
 
-		beginTimestamp, err := naturaldate.Parse(beginTime, time.Now())
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "Failed to convert time string: %s\n", err.Error())
-		}
-
-		endTimeStamp, err := naturaldate.Parse(endTime, time.Now())
-		if err != nil {
-			fmt.Fprintf(os.Stderr, "Failed to convert time string: %s\n", err.Error())
-		}
-
 		q := strings.Join(args, " ")
-		if workDir != "%" {
-			workDir, err = filepath.Abs(workDir)
+
+		opts := searchopts{}
+		opts.order = "ASC"
+		if q != "" {
+			cmd := "%" + q + "%"
+			opts.command = &cmd
+		}
+		if workDir != "" {
+			wd, err := filepath.Abs(workDir)
 			if err != nil {
 				fmt.Fprintf(os.Stderr, "Failed parse working directory path: %s\n", err.Error())
 			}
+			opts.workdir = &wd
 		}
-
-		results := search(conn, "%"+q+"%", workDir, beginTimestamp, endTimeStamp, retVal)
+		if afterTime != "" {
+			afterTimestamp, err := naturaldate.Parse(afterTime, time.Now())
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "Failed to convert time string: %s\n", err.Error())
+			}
+			opts.after = &afterTimestamp
+		}
+		if beforeTime != "" {
+			beforeTimestamp, err := naturaldate.Parse(beforeTime, time.Now())
+			if err != nil {
+				fmt.Fprintf(os.Stderr, "Failed to convert time string: %s\n", err.Error())
+			}
+			opts.before = &beforeTimestamp
+		}
+		if retVal != -9001 {
+			opts.retval = &retVal
+		}
+		results := search(conn, opts)
 
 		previousCmd := ""
 		for e := results.Front(); e != nil; e = e.Next() {