My build of nnn with minor changes
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  1. #!/usr/bin/env sh
  2. # Description: Terminal based file previewer
  3. #
  4. # Note: This plugin needs a "NNN_FIFO" to work. See man.
  5. #
  6. # Dependencies:
  7. # - Supports 3 independent methods to preview with:
  8. # - tmux (>=3.0), or
  9. # - kitty with allow_remote_control on, or
  10. # - $TERMINAL set to a terminal (it's xterm by default).
  11. # - less or $PAGER
  12. # - tree or exa or ls
  13. # - mediainfo or file
  14. # - mktemp
  15. # - unzip
  16. # - tar
  17. # - man
  18. # - optional: bat for code syntax highlighting
  19. # - optional: kitty terminal, catimg, viu, or ueberzug for images
  20. # - optional: scope.sh file viewer from ranger.
  21. # To use:
  22. # 1. drop scope.sh executable in $PATH
  23. # 2. set/export $USE_SCOPE as 1
  24. # - optional: pistol file viewer (https://github.com/doronbehar/pistol).
  25. # To use:
  26. # 1. install pistol
  27. # 2. set/export $USE_PISTOL as 1
  28. # - optional: ffmpegthumbnailer for video thumbnails (https://github.com/dirkvdb/ffmpegthumbnailer).
  29. # To use:
  30. # 1. install ffmpegthumbnailer
  31. # 2. set/export USE_VIDEOTHUMB as 1
  32. #
  33. # Usage:
  34. # You need to set a NNN_FIFO path and a key for the plugin with NNN_PLUG,
  35. # then start `nnn`:
  36. #
  37. # $ nnn -a
  38. #
  39. # or
  40. #
  41. # $ NNN_FIFO=/tmp/nnn.fifo nnn
  42. #
  43. # Then in `nnn`, launch the `preview-tui` plugin.
  44. #
  45. # If you provide the same NNN_FIFO to all nnn instances, there will be a
  46. # single common preview window. If you provide different FIFO path (e.g.
  47. # with -a), they will be independent.
  48. #
  49. # The previews will be shown in a tmux split. If that isn't possible, it
  50. # will try to use a kitty terminal split. And as a final fallback, a
  51. # different terminal window will be used ($TERMINAL).
  52. #
  53. # Tmux and kitty users can configure $SPLIT to either "h" or "v" to set a
  54. # 'h'orizontal split or a 'v'ertical split (as in, the line that splits the
  55. # windows will be horizontal or vertical).
  56. #
  57. # Kitty users need `allow_remote_control` set to `yes`. To customize the
  58. # window split, `enabled_layouts` has to be set to `all` or `splits` (the
  59. # former is the default value). This terminal is also able to show images
  60. # without extra dependencies.
  61. #
  62. # Shell: POSIX compliant
  63. # Authors: Todd Yamakawa, Léo Villeveygoux, @Recidiviste, Mario Ortiz Manero
  64. SPLIT="$SPLIT" # you can set a permanent split here
  65. TERMINAL="$TERMINAL" # same goes for the terminal
  66. USE_SCOPE="${USE_SCOPE:-0}"
  67. USE_PISTOL="${USE_PISTOL:-0}"
  68. USE_VIDEOTHUMB="${USE_VIDEOTHUMB:-0}"
  69. PAGER="${PAGER:-less -R}"
  70. [ "$PAGER" = "most" ] && PAGER="less -R"
  71. if [ -e "${TMUX%%,*}" ] && tmux -V | grep -q '[ -][3456789]\.'; then
  72. TERMINAL=tmux
  73. elif [ -n "$KITTY_WINDOW_ID" ] && kitty @ ls >/dev/null 2>&1; then
  74. TERMINAL=kitty
  75. else
  76. TERMINAL="${TERMINAL:-xterm}"
  77. fi
  78. if [ -z "$SPLIT" ] && [ $(($(tput lines) * 2)) -gt "$(tput cols)" ]; then
  79. SPLIT='h'
  80. elif [ "$SPLIT" != 'h' ]; then
  81. SPLIT='v'
  82. fi
  83. exists() {
  84. which "$1" >/dev/null 2>&1
  85. }
  86. fifo_pager() {
  87. cmd="$1"
  88. shift
  89. # We use a FIFO to access $PAGER PID in jobs control
  90. tmpfifopath="${TMPDIR:-/tmp}/nnn-preview-tui-fifo.$$"
  91. mkfifo "$tmpfifopath" || return
  92. $PAGER < "$tmpfifopath" &
  93. (
  94. exec > "$tmpfifopath"
  95. "$cmd" "$@" &
  96. )
  97. rm "$tmpfifopath"
  98. }
  99. # Binary file: show file info inside the pager
  100. print_bin_info() {
  101. printf -- "-------- \033[1;31mBinary file\033[0m --------\n"
  102. if exists mediainfo; then
  103. mediainfo "$1" 2>/dev/null
  104. else
  105. file -b "$1"
  106. fi
  107. }
  108. preview_file () {
  109. kill %- %+ 2>/dev/null && wait %- %+ 2>/dev/null
  110. clear
  111. # Trying to use pistol if it's available.
  112. if [ "$USE_PISTOL" -ne 0 ] && exists pistol; then
  113. fifo_pager pistol "$1"
  114. return
  115. fi
  116. # Trying to use scope.sh if it's available.
  117. if [ "$USE_SCOPE" -ne 0 ] && exists scope.sh; then
  118. fifo_pager scope.sh "$1" "$cols" "$lines" "$(mktemp -d)" \
  119. "True" 2>/dev/null
  120. return
  121. fi
  122. # Detecting the exact type of the file: the encoding, mime type, and
  123. # extension in lowercase.
  124. encoding="$(file -Lb --mime-encoding -- "$1")"
  125. mimetype="$(file -Lb --mime-type -- "$1")"
  126. ext="${1##*.}"
  127. if [ -n "$ext" ]; then
  128. ext="$(printf "%s" "${ext}" | tr '[:upper:]' '[:lower:]')"
  129. fi
  130. lines=$(($(tput lines)-1))
  131. cols=$(tput cols)
  132. # Otherwise, falling back to the defaults.
  133. if [ -d "$1" ]; then
  134. cd "$1" || return
  135. if exists tree; then
  136. fifo_pager tree -L 3 -F
  137. elif exists exa; then
  138. fifo_pager exa -G --colour=always 2>/dev/null
  139. else
  140. fifo_pager ls --color=always
  141. fi
  142. elif [ "$encoding" = "binary" ]; then
  143. if [ "${mimetype%%/*}" = "image" ] || [ "${mimetype%%/*}" = "video" ]; then
  144. if [ "${mimetype%%/*}" = "video" ] && [ "$USE_VIDEOTHUMB" -ne 0 ] && exists ffmpegthumbnailer; then
  145. videothumb="/tmp/videothumb.$$.png"
  146. ffmpegthumbnailer -s 512 -i "$1" -o "$videothumb" >/dev/null 2>&1
  147. set "$videothumb"
  148. trap 'rm "$videothumb"' EXIT
  149. fi
  150. if [ "$TERMINAL" = "kitty" ]; then
  151. # Kitty terminal users can use the native image preview method.
  152. kitty +kitten icat --silent --transfer-mode=stream --stdin=no \
  153. "$1" &
  154. elif exists catimg; then
  155. catimg "$1"
  156. elif exists viu; then
  157. viu -t "$1"
  158. elif exists ueberzug; then
  159. preview_ueberzug "$cols" "$lines" "$1"
  160. else
  161. fifo_pager print_bin_info "$1"
  162. fi
  163. elif [ "$mimetype" = "application/zip" ] ; then
  164. fifo_pager unzip -l "$1"
  165. elif [ "$ext" = "gz" ] || [ "$ext" = "bz2" ] ; then
  166. fifo_pager tar -tvf "$1"
  167. else
  168. fifo_pager print_bin_info "$1"
  169. fi
  170. elif [ "$mimetype" = "text/troff" ] ; then
  171. fifo_pager man -Pcat -l "$1"
  172. else
  173. if exists bat; then
  174. fifo_pager bat --terminal-width="$cols" --paging=never --decorations=always --color=always \
  175. "$1" 2>/dev/null
  176. else
  177. $PAGER "$1" &
  178. fi
  179. fi
  180. }
  181. preview_ueberzug() {
  182. {
  183. printf '{"action": "add", "identifier": "nnn_ueberzug", "x": 0, "y": 0, "width": "%s", "height": "%s", "path": "%s"}\n' "$1" "$2" "$3"
  184. read -r
  185. } | ueberzug layer --parser json
  186. }
  187. if [ "$PREVIEW_MODE" ] ; then
  188. if [ ! -r "$NNN_FIFO" ] ; then
  189. echo "No FIFO available! (\$NNN_FIFO='$NNN_FIFO')" >&2
  190. read -r
  191. exit 1
  192. fi
  193. preview_file "$1"
  194. # use cat instead of 'exec <' to avoid issues with dash shell
  195. # shellcheck disable=SC2002
  196. cat "$NNN_FIFO" |\
  197. while read -r selection ; do
  198. preview_file "$selection"
  199. done
  200. # Restoring the previous layout for kitty users. This will only work for
  201. # kitty >= 0.18.0.
  202. if [ "$TERMINAL" = "kitty" ]; then
  203. kitty @ last-used-layout --no-response >/dev/null 2>&1
  204. fi
  205. exit 0
  206. fi
  207. if [ "$TERMINAL" = "tmux" ]; then
  208. # tmux splits are inverted
  209. if [ "$SPLIT" = "v" ]; then SPLIT="h"; else SPLIT="v"; fi
  210. tmux split-window -e "NNN_FIFO=$NNN_FIFO" -e "PREVIEW_MODE=1" -d"$SPLIT" "$0" "$1"
  211. elif [ "$TERMINAL" = "kitty" ]; then
  212. # Setting the layout for the new window. It will be restored after the
  213. # script ends.
  214. kitty @ goto-layout splits >/dev/null
  215. # Trying to use kitty's integrated window management as the split window.
  216. # All environmental variables that will be used in the new window must
  217. # be explicitly passed.
  218. kitty @ launch --no-response --title "nnn preview" --keep-focus \
  219. --cwd "$PWD" --env "PATH=$PATH" --env "NNN_FIFO=$NNN_FIFO" \
  220. --env "PREVIEW_MODE=1" --env "PAGER=$PAGER" \
  221. --env "USE_SCOPE=$USE_SCOPE" --env "SPLIT=$SPLIT" \
  222. --env "USE_PISTOL=$USE_PISTOL" \
  223. --location "${SPLIT}split" "$0" "$1" >/dev/null
  224. else
  225. PREVIEW_MODE=1 $TERMINAL -e "$0" "$1" &
  226. fi