Add :keys command to list current key bindings.

This outputs the result of [`listBinds`] to a temporary file
and then pass it to `$PAGER`. A bit of care is taken to remove
the temporary file and refresh lf (just in case it's showing
`/tmp`).

I haven't tested it on Windows, since `lf` doesn't seem to work
on `wine`, but I think it should work there too.

It would be a bit more elegant to pipe the output directly to
`$PAGER` without a temporary file, but that would require larger
code changes, which doesn't seem worth it at the moment.

[`listBinds`]: https://github.com/gokcehan/lf/blob/e03143299d4596bbc9bb8a2d8a1b0931e3183410/ui.go#L940

complete.go

@@ -77,6 +77,7 @@ var (
  "mark-remove",
  "tag",
  "tag-toggle",
+ "keys",
  "cmd-escape",
  "cmd-complete",
  "cmd-menu-complete",

doc.go

@@ -10,74 +10,75 @@ This documentation can either be read from terminal using 'lf -doc' or online at
 You can also use 'doc' command (default '<f-1>') inside lf to view the documentation in a pager.
 A man page with the same content is also available in the repository at https://github.com/gokcehan/lf/blob/master/lf.1
 
-You can run 'lf -help' to see descriptions of command line options.
+You can run 'lf -help' to see descriptions of command line options. The 'keys' command inside lf lists available key bindings.
 
 # Quick Reference
 
 The following commands are provided by lf:
 
- quit (default 'q')
- up (default 'k' and '<up>')
- half-up (default '<c-u>')
- page-up (default '<c-b>' and '<pgup>')
- scroll-up (default '<c-y>')
- down (default 'j' and '<down>')
- half-down (default '<c-d>')
- page-down (default '<c-f>' and '<pgdn>')
- scroll-down (default '<c-e>')
- updir (default 'h' and '<left>')
- open (default 'l' and '<right>')
- jump-next (default ']')
- jump-prev (default '[')
- top (default 'gg' and '<home>')
- bottom (default 'G' and '<end>')
- high (default 'H')
- middle (default 'M')
- low (default 'L')
- toggle
- invert (default 'v')
- unselect (default 'u')
- glob-select
- glob-unselect
- calcdirsize
- copy (default 'y')
- cut (default 'd')
- paste (default 'p')
- clear (default 'c')
- sync
- draw
- redraw (default '<c-l>')
- load
- reload (default '<c-r>')
- echo
- echomsg
- echoerr
- cd
- select
- delete (modal)
- rename (modal) (default 'r')
- source
- push
- read (modal) (default ':')
- shell (modal) (default '$')
- shell-pipe (modal) (default '%')
- shell-wait (modal) (default '!')
- shell-async (modal) (default '&')
- find (modal) (default 'f')
- find-back (modal) (default 'F')
- find-next (default ';')
- find-prev (default ',')
- search (modal) (default '/')
- search-back (modal) (default '?')
- search-next (default 'n')
- search-prev (default 'N')
- filter (modal)
- setfilter
- mark-save (modal) (default 'm')
- mark-load (modal) (default "'")
- mark-remove (modal) (default '"')
- tag
- tag-toggle (default 't')
+ quit (default 'q')
+ keys
+ up (default 'k' and '<up>')
+ half-up (default '<c-u>')
+ page-up (default '<c-b>' and '<pgup>')
+ scroll-up (default '<c-y>')
+ down (default 'j' and '<down>')
+ half-down (default '<c-d>')
+ page-down (default '<c-f>' and '<pgdn>')
+ scroll-down (default '<c-e>')
+ updir (default 'h' and '<left>')
+ open (default 'l' and '<right>')
+ jump-next (default ']')
+ jump-prev (default '[')
+ top (default 'gg' and '<home>')
+ bottom (default 'G' and '<end>')
+ high (default 'H')
+ middle (default 'M')
+ low (default 'L')
+ toggle
+ invert (default 'v')
+ unselect (default 'u')
+ glob-select
+ glob-unselect
+ calcdirsize
+ copy (default 'y')
+ cut (default 'd')
+ paste (default 'p')
+ clear (default 'c')
+ sync
+ draw
+ redraw (default '<c-l>')
+ load
+ reload (default '<c-r>')
+ echo
+ echomsg
+ echoerr
+ cd
+ select
+ delete (modal)
+ rename (modal) (default 'r')
+ source
+ push
+ read (modal) (default ':')
+ shell (modal) (default '$')
+ shell-pipe (modal) (default '%')
+ shell-wait (modal) (default '!')
+ shell-async (modal) (default '&')
+ find (modal) (default 'f')
+ find-back (modal) (default 'F')
+ find-next (default ';')
+ find-prev (default ',')
+ search (modal) (default '/')
+ search-back (modal) (default '?')
+ search-next (default 'n')
+ search-prev (default 'N')
+ filter (modal)
+ setfilter
+ mark-save (modal) (default 'm')
+ mark-load (modal) (default "'")
+ mark-remove (modal) (default '"')
+ tag
+ tag-toggle (default 't')
 
 The following command line commands are provided by lf:
 
@@ -214,6 +215,7 @@ The following additional keybindings are provided by default:
  map se :set sortby ext; set info
  map gh cd ~
  map <space> :toggle; down
+ map <f-1> :doc
 
 # Configuration
 
@@ -274,6 +276,10 @@ Modal commands do not take any arguments, but instead change the operation mode
 
 Quit lf and return to the shell.
 
+ keys
+
+List active key bindings in the pager.
+
  up (default 'k' and '<up>')
  half-up (default '<c-u>')
  page-up (default '<c-b>' and '<pgup>')

eval.go

@@ -1540,6 +1540,25 @@ func (e *callExpr) eval(app *app, args []string) {
  app.ui.echomsg(strings.Join(e.args, " "))
  case "echoerr":
  app.ui.echoerr(strings.Join(e.args, " "))
+ case "keys":
+ tempfile, err := os.CreateTemp("", "lf_bindings")
+ if err != nil {
+ app.ui.echoerrf("keys: %s:", err)
+ return
+ }
+ _, err = tempfile.Write(listBinds(gOpts.keys).Bytes())
+ tempfile.Close()
+
+ filename := tempfile.Name()
+ if err == nil {
+ app.runShell(pageFileCommand(filename), e.args, "$")
+ }
+
+ os.Remove(filename)
+ app.ui.loadFile(app, false)
+ if err != nil {
+ app.ui.echoerrf("keys: %s:", err)
+ }
  case "cd":
  path := "~"
  if len(e.args) > 0 {