Wrapper scripts to open each passed URL as an image in various environments (such as Termux on Android, and IrfanView on Cygwin for Windows), meant to be used with the `toot` CLI Mastodon client.

toot_media_viewer_cygwin_irfanview.sh

#!/usr/bin/env bash
PATH_TO_IRFANVIEW="${HOME}/iview454_setup/i_view32.exe"
tmpfilelist="$(mktemp "${TMP}/toot_media_viewer.XXXXXX.filelist.txt")"
tmpfilelist_win="$(mktemp "${TMP}/toot_media_viewer.XXXXXX.win.filelist.txt")"

# Loop through all arguments passed to the script, assuming they are all URLs
for url in "$@"
do
	basename="$(basename "$url")"
	# Get the extension from the URL's basename. Default to 'png' if basename has no period
	extension="$([[ $basename == *.* ]] && printf '%s' "${basename##*.}" || printf 'png')"
	# Get a random temp filename.
	tmpfile="$(mktemp "${TMP}/toot_media_viewer.XXXXXX.${extension}")"
	
	# Retrieve the current URL passed via the arguments and store in tmpfile. 
	# Also store the Windows-style path in a newline separated textfile
	# As well as store the cygwin path in another newline separated textfile for tempfile cleanup
	curl --silent "$url" > "$tmpfile" && echo "$(cygpath -w "$tmpfile")" >> "$tmpfilelist_win"  && echo "$tmpfile" >> "$tmpfilelist" 
done

# Launch IrfanView with a filelist containing Windows paths to the image tempfiles and wait for IrfanView to be closed before continuing with deleting all the tempfiles.
cygstart -w -o "$PATH_TO_IRFANVIEW" /filelist="$(cygpath -w "$tmpfilelist_win")" && $(while IFS= read -r file ; do rm -- "$file" ; done < "$tmpfilelist")

# Delete both filelists with paths to the tempfiles.
rm "$tmpfilelist"
rm "$tmpfilelist_win"

toot_media_viewer_termux.sh

#!/bin/sh
for var in "$@"
do
	termux-open --content-type image "$var"
done