shfm [wip]
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wip file manager written in posix shell

note: likely very broken


features
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* really nice escape sequence handling for keys which emit '\033[<stuff>'. Not
  based on read timeouts. Based on tracking position within sequences.

* no dependencies other than a POSIX shell and POSIX (printf, dd, [ and stty)

* movement uses vim-like keybinds (hjkl).


todo
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- [x] scrolling is torture.
- [x] stop redrawing whole screen on key press.
- [x] store list somehow.
- [ ] search
- [ ] prompts
- [x] opener
- [x] resize


keybinds
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j - down
k - up
l - open file or directory
h - go up level
g - go to top
G - go to bottom
q - quit


opener
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opening files in different applications (based on mime-type or file extension)
can be achieved via an environment variable (SHFM_OPENER) set to the location of
a small external script. The default for all files will be '$EDITOR' (and if
that is unset, 'vi').

The script receives a single argument, the full path to the selected file.
The opener script is also useful on the command-line.

Example scripts:

    #!/bin/sh -e
    #
    # open file in application based on file extension

    case $1 in
        *.mp3|*.flac|*.wav)
            mpv --no-video "$1"
        ;;

        *.mp4|*.mkv|*.webm)
            mpv "$1"
        ;;

        *.png|*.gif||*.jpg|*.jpe|*.jpeg)
            gimp "$1"
        ;;

        *.html|*.pdf)
            firefox "$1"
        ;;

        # all other files
        *)
            "${EDITOR:=vi}" "$1"
        ;;
    esac


    #!/bin/sh -e
    #
    # open file in application based on mime-type

    mime_type=$(file -bi)

    case $mime_type in
        audio/*)
           mpv --no-video "$1"
        ;;

        video/*)
            mpv "$1"
        ;;

        image/*)
            gimp "$1"
        ;;

        text/html*|application/pdf*)
            firefox "$1"
        ;;

        text/*|)
            "${EDITOR:=vi}" "$1"
        ;;

        *)
            printf 'unknown mime-type %s\n' "$mime_type"
        ;;
    esac