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+# Copy this file into /usr/share/zsh/site-functions/
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+# and add 'autoload n-preview` to .zshrc
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+#
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+# This is partially a test if n-list-draw and n-list-input can be
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+# used multiple times to create multiple lists. It might become
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+# more usable if someone adds more features like previewing of
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+# archive contents.
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+
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+emulate -L zsh
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+
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+zmodload zsh/curses
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+
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+setopt typesetsilent extendedglob
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+trap "return" TERM INT QUIT
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+trap "_vpreview_exit" EXIT
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+
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+local IFS="
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+"
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+
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+[ -f ~/.config/znt/n-list.conf ] && . ~/.config/znt/n-list.conf
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+
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+[[ "$colorpair" = "" ]] && colorpair="white/black"
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+local background="${colorpair#*/}"
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+
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+# Drawing and input
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+autoload n-list-draw n-list-input
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+
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+# Cleanup before any exit
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+_vpreview_exit() {
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+ zcurses 2>/dev/null delwin files
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+ zcurses 2>/dev/null delwin body
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+ zcurses 2>/dev/null delwin status
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+ zcurses 2>/dev/null refresh
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+ zcurses end
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+}
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+
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+# Outputs a message in the bottom of the screen
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+_vpreview_status_msg() {
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+ zcurses move status 1 2
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+ zcurses clear status eol
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+ zcurses string status "$1"
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+}
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+
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+# Prefer tput, then module terminfo
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+_nlist_cursor_visibility() {
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+ if type tput 2>/dev/null 1>&2; then
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+ [ "$1" = "1" ] && tput cvvis
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+ [ "$1" = "0" ] && tput civis
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+ elif [ "$has_termcap" = "1" ]; then
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+ [ "$1" = "1" ] && [ -n $terminfo[cvvis] ] && echo -n $terminfo[cvvis]
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+ [ "$1" = "0" ] && [ -n $terminfo[civis] ] && echo -n $terminfo[civis]
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+ fi
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+}
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+
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+#
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+# Main code
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+#
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+
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+integer term_height="$LINES"
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+integer term_width="$COLUMNS"
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+if [[ "$term_height" -lt 1 || "$term_width" -lt 1 ]]; then
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+ local stty_out=$( stty size )
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+ term_height="${stty_out% *}"
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+ term_width="${stty_out#* }"
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+fi
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+
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+integer status_height=3
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+integer status_width=term_width
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+integer status_page_height=1
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+integer status_page_width=term_width-2
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+
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+integer files_height=term_height-status_height
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+integer files_width=term_width/5
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+integer files_page_height=files_height-2
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+integer files_page_width=files_width-2
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+
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+integer body_height=term_height-status_height
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+integer body_width=term_width-files_width
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+integer body_page_height=body_height-2
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+integer body_page_width=body_width
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+
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+integer _from_what_idx_list_is_shown_1=1
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+integer current_1=1
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+
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+integer _from_what_idx_list_is_shown_2=1
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+integer current_2=1
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+integer hscroll_2=0
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+
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+integer active_window=0
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+
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+local ansi_mode="ansi"
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+[ -f ~/.config/znt/n-preview.conf ] && . ~/.config/znt/n-preview.conf
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+typeset -a hcmd
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+#if type pygmentize 2>/dev/null 1>&2; then
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+# hcmd=( pygmentize -g )
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+if type highlight 2>/dev/null 1>&2; then
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+ hcmd=( highlight -q --force -O ansi )
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+elif type source-highlight 2>/dev/null 1>&2; then
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+ # Warning: source-highlight can have problems
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+ hcmd=( source-highlight --failsafe -fesc -o STDOUT -i )
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+else
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+ ansi_mode="noansi"
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+fi
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+
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+zcurses init
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+zcurses addwin status "$status_height" "$status_width" $(( term_height - status_height )) 0
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+zcurses addwin files "$files_height" "$files_width" 0 0
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+zcurses addwin body "$body_height" "$body_width" 0 "$files_width"
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+zcurses bg status white/black
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+zcurses bg files white/black
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+zcurses bg body white/black
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+
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+#
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+# Listening for input
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+#
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+
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+local key keypad
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+
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+# Clear input buffer
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+zcurses timeout status 0
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+zcurses input status key keypad
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+zcurses timeout status -1
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+key=""
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+keypad=""
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+
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+typeset -a filenames
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+integer last_element_1
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+
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+typeset -a body
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+integer last_element_2
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+
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+filenames=( *(N) )
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+filenames=( "${(@M)filenames:#(#i)*$1*}" )
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+
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+local NLIST_GREP_STRING="$1"
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+
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+integer last_element_1="$#filenames"
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+integer last_element_2=0
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+
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+local selection action final_key
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+
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+while (( 1 )); do
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+ # Output the lists
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+ integer end_idx=$(( _from_what_idx_list_is_shown_1 + files_page_height - 1 ))
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+ [ "$end_idx" -gt "$last_element_1" ] && end_idx=last_element_1
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+
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+ n-list-draw "$(( (current_1 -1) % files_page_height + 1 ))" \
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+ "$files_page_height" "$files_page_width" 1 2 0 files \
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+ "${(@)filenames[_from_what_idx_list_is_shown_1, end_idx]}"
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+
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+ if [ "$#body" -ge 1 ]; then
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+ end_idx=$(( _from_what_idx_list_is_shown_2 + body_page_height - 1 ))
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+ [ "$end_idx" -gt "$last_element_2" ] && end_idx=last_element_2
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+
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+ n-list-draw "$(( (current_2 -1) % body_page_height + 1 ))" \
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+ "$body_page_height" "$body_page_width" 1 0 "$hscroll_2" body \
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+ "${(@)body[_from_what_idx_list_is_shown_2, end_idx]}"
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+ fi
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+
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+ [[ "$active_window" -eq 0 ]] && zcurses border files
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+ zcurses border status
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+ zcurses refresh files body status
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+
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+ # Wait for input
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+ zcurses input status key keypad
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+
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+ # Get the special (i.e. "keypad") key or regular key
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+ if [ -n "$key" ]; then
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+ final_key="$key"
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+ elif [ -n "$keypad" ]; then
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+ final_key="$keypad"
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+ else
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+ _vpreview_status_msg "Inproper input detected"
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+ zcurses refresh status
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+ fi
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+
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+ if [ "$active_window" -eq 0 ]; then
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+ zcurses clear files
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+ n-list-input "$current_1" "$_from_what_idx_list_is_shown_1" "$files_page_height" \
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+ "$files_page_width" "$last_element_1" 0 "$final_key"
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+
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+ selection="$reply[1]"
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+ action="$reply[2]"
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+ current_1="$reply[3]"
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+ _from_what_idx_list_is_shown_1="$reply[4]"
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+
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+ if [ "$action" = "SELECT" ]; then
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+ # Load new file and refresh the displaying window
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+ local filename="$filenames[$selection]"
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+ if [ "$ansi_mode" = "ansi" ]; then
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+ body=( "${(@f)"$( "$hcmd[@]" "$filename" )"}" )
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+ else
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+ body=( "${(@f)"$(<$filename)"}" )
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+ fi
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+ last_element_2="$#body"
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+ current_2=1
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+ _from_what_idx_list_is_shown_2=1
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+ zcurses clear body
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+ fi
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+ elif [ "$active_window" -eq 1 ]; then
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+ zcurses clear body
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+ n-list-input "$current_2" "$_from_what_idx_list_is_shown_2" "$body_page_height" \
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+ "$body_page_width" "$last_element_2" "$hscroll_2" "$final_key"
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+
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+ selection="$reply[1]"
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+ action="$reply[2]"
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+ current_2="$reply[3]"
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+ _from_what_idx_list_is_shown_2="$reply[4]"
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+ hscroll_2="$reply[5]"
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+
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+ fi
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+
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+ if [ "$action" = "LEAVE" ]; then
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+ active_window=1-active_window
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+ elif [ "$action" = "QUIT" ]; then
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+ break
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+ elif [ "$action" = "REDRAW" ]; then
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+ zcurses clear files redraw
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+ zcurses clear body redraw
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+ zcurses clear status redraw
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+ fi
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+done
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+
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+# vim: set filetype=zsh:
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Philipp Schmitt
