add support for arguments

bookmobile

@@ -1,17 +1,108 @@
 #!/usr/bin/env fish
+# Lee2sman 2021
 
-set theme themes/medium.css
+# Defaults
+set theme themes/medium.css 
+set format html
+set output .
 
-# get title
-set title (readable $argv --properties "title")
+function check_prereq
+  if not command -sq pandoc
+	echo "Bookmobile requires pandoc but it's not installed. Exiting."
+	exit 1
+    end
+end
 
-echo "title: " $title
+function usage
+  echo "Bookmobile: Simple command line script to download articles for offline reading as html, epub or markdown. Saves a simplified html document to current directory as default." 
+  echo ""
+  echo "Optionally, you can specify a theme, format and output directory"
+  echo ""
+  echo "Usage: ./bookmobile url [ --theme THEME ] [ --format FORMAT ] [ --output OUTPUT ]" 
+  echo "                    [-h | --help ]"
+  echo ""
+  echo "Options:"
+  echo ""
+  echo "    --help" 
+  echo "    -h         Display usage info"
+  echo ""
+  echo "    --theme THEME"
+  echo "    -t THEME   Set theme for reader format. Default: medium"
+  echo "               Theme options: " 
+  for theme in themes/*.css
+      echo (string replace -r '\.[^\.]+$' '' (basename $theme))
+  end
+  echo ""
+  echo "    --format FORMAT" 
+  echo "    -f FORMAT  Set file format (html, reader, markdown, epub)"
+  echo "               default: html"
+  echo ""
+  echo "    --output OUTPUT" 
+  echo "    -o OUTPUT  Set output location"
+  echo "               default: current directory"
+  echo ""
+end
 
-# pulldown html page
-readable $argv --output originals/$title.html 
+function check_args
+  for current_arg in (seq 1 (count $argv))
+    set next_arg $argv[(math $current_arg + 1)]
 
-pandoc --self-contained -f html -t html -c $theme -o reader/$title.html originals/$title.html
+    switch $argv[$current_arg]
+    case -h --help
+      usage
+      break
+    case -t --theme
+      echo "theme: " $next_arg
+      set -g theme themes/$next_arg.css 
+    case -f --format
+      echo "format: " $next_arg
+      set -g format $next_arg
+    case -o --output
+      echo "output: " $next_arg
+      set -g output $next_arg
+    end
+  end
+end
 
-pandoc -f html -t markdown_github-raw_html -o markdown/$title.md originals/$title.html
+function set_metadata
+  set -g url $argv[1]
 
-pandoc -f html -t epub -o epubs/$title.epub originals/$title.html
+  set -g title (readable $url --properties "title")
+
+  if test -z "$title" #if title was empty, set title to date time 
+    set -g title (date "+%Y-%m-%d_%H:%M:%S")
+  end
+
+  echo "Title: " $title
+  echo "URL: " $url
+end
+
+function process_article
+  # pulldown html page
+  readable $url --output $output/$title.html 
+
+  switch $format
+    case html
+      #just a placeholder
+      echo "Html saved to " $output
+    case reader
+      pandoc -s $output/$title.html -c $theme -o $output/$title-article.html
+      rm -f $output/$title.html
+      echo "Reader file saved to " $output " with theme " $theme
+    case markdown
+      pandoc -f html -t markdown_github-raw_html -o $output/$title.md $output/$title.html
+      rm -f $output/$title.html
+      echo "Markdown file saved to " $output
+    case epub
+      pandoc -s $output/$title.html -f html -t epub -o $output/$title.epub 
+      rm -f $output/$title.html
+      echo "Epub saved to " $output
+    case '*'
+        echo "Invalid output format"
+    end
+end
+
+check_prereq
+check_args $argv
+set_metadata $argv
+process_article