move lf previewer from dotfiles repo to this repo

file_previewer.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+# File preview handler for lf.
+
+preview_filepath="/tmp/lf_preview_image.png"
+
+case "$(file --dereference --brief --mime-type -- "$1")" in
+    # gzip or doc or ISO or docx
+    application/gzip | application/msword | application/x-iso9660-image | application/vnd.openxmlformats-officedocument.wordprocessingml.document)
+        exiftool "$1" | bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization;;
+
+    application/json) 
+        jq --color-output . "$1" | bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization;;
+
+    application/pdf)
+        pdftoppm -jpeg "$1" -singlefile | chafa --size="$(($2-4))"x"$3" --animate off
+        pdfinfo "$1" | bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization;;
+
+    application/vnd.sqlite3)
+        sqlite3 "$1" "SELECT * FROM sqlite_master WHERE type = 'table';" | bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization;;
+
+    application/x-pcapng | application/octet-stream)    # `mimetype` gives the first mimetype while `file` gives the second
+        tshark -r "$1" | bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization;;   # the --read-file option does not seem to work
+    
+    application/zip)
+        unzip -lv "$1" | bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization;;
+
+    audio/*)
+        exiftool -Picture -b "$1" | chafa --size="$(($2-4))"x"$3" --animate off || chafa cover.* --size="$(($2-4))"x"$3" --animate off 
+        exiftool "$1" | bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization;;
+
+    video/*)
+        ffmpeg -ss 00:00:00 -i "$1" -frames:v 1 "$preview_filepath"    
+        chafa "$preview_filepath" --size="$(($2-4))"x"$3"
+        rm "$preview_filepath"  # removing preview file so that lf looks for a new preview image instead of going for an old one
+        exiftool "$1" | bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization;;
+
+    image/*)
+        chafa "$1" --size="$(($2-4))"x"$3" --animate off
+        exiftool "$1" | bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization;;
+
+    *)
+        bat --theme='base16' --terminal-width "$(($2-4))" --force-colorization "$1"
+esac