A simple but well coloured feed reader written in bash

Question

Hello everyone.
I wrote these two functions for my .bashrc:
#!/bin/bash
if [ ! -n "$FEED_BOOKMARKS" ]; then export FEED_BOOKMARKS=$HOME/.feed_bookmarks; fi
if [ ! -d "$FEED_BOOKMARKS" ]; then mkdir -p $FEED_BOOKMARKS; fi
feed() {
if [ ! -d $FEED_BOOKMARKS ]; then mkdir $FEED_BOOKMARKS; fi
if [ ! -n "$1" ]; then
echo -e "\\n \\e[04mUsage\\e[00m\\n\\n \\e[01;37m\$ feed \\e[01;31m<url>\\e[00m \\e[01;31m<new bookmark?>\\e[00m\\n\\n \\e[04mSee also\\e[00m\\n\\n \\e[01;37m\$ deef\\e[00m\\n"
return 1;
fi
local rss_source="$(curl --silent $1 | sed -e ':a;N;$!ba;s/\n/ /g')";
if [ ! -n "$rss_source" ]; then
echo "The feed is empty";
return 1;
fi
# THE RSS PARSER
# The characters "£, §" are used as metacharacters. They should not be encountered in a feed...
echo -e "$(echo $rss_source | \
sed -e 's/&gt;/>/g' \
-e 's/&lt;/</g' \
-e 's/<\/a>/£/g' \
-e 's/href\=\"/§/g' \
-e 's/<title>/\\n\\n\\n :: \\e[01;31m/g' -e 's/<\/title>/\\e[00m ::\\n/g' \
-e 's/<link>/ [ \\e[01;36m/g' -e 's/<\/link>/\\e[00m ]/g' \
-e 's/<description>/\\n\\n\\e[00;37m/g' -e 's/<\/description>/\\e[00m\\n\\n/g' \
-e 's/<p>\|<br\s*\/\?>/\n/g' \
-e 's/<b>\|<strong>/\\e[01;30m/g' -e 's/<\/b>\|<\/strong>/\\e[00;37m/g' \
-e 's/<u>/\\e[4;37m/g' -e 's/<\/u>/\\e[00;37m/g' \
-e 's/<b>\|<code>/\\e[00m/g' -e 's/<\/b>\|<\/code>/\\e[00;37m/g' \
-e 's/<a[^§]*§\([^\"]*\)\"[^>]*>\([^£]*\)[^£]*£/\\e[01;31m\2\\e[00;37m \\e[01;34m[\\e[00;37m \\e[04m\1\\e[00;37m\\e[01;34m ]\\e[00;37m/g' \
-e 's/<li>/\n \\e[01;34m*\\e[00;37m /g' \
-e 's/<!\[CDATA\[\|\]\]>\|>\s*<//g' \
-e 's/<[^>]*>/ /g' \
-e 's/[<>£§]//g')\n\n";
# END OF THE RSS PARSER
if [ -n "$2" ]; then
echo "$1" > $FEED_BOOKMARKS/$2
echo -e "\\n\\t\\e[01;37m==> \\e[01;31mBookmark saved as \\e[01;36m\\e[04m$2\\e[00m\\e[01;37m <==\\e[00m\\n"
fi
deef() {
if test -n "$1"; then
if [ ! -r "$FEED_BOOKMARKS/$1" ]; then
echo -e "\\n \\e[01;31mBookmark \\e[01;36m\\e[04m$1\\e[00m\\e[01;31m not found.\\e[00m\\n\\n \\e[04mType:\\e[00m\\n\\n \\e[01;37m\$ deef\\e[00m (without arguments)\\n\\n to get the complete list of all currently saved bookmarks.\\n";
return 1;
fi
local url="$(cat $FEED_BOOKMARKS/$1)";
if [ ! -n "$url" ]; then
echo "The bookmark is empty";
return 1;
fi
echo -e "\\n\\t\\e[01;37m==> \\e[01;31m$url\\e[01;37m <==\\e[00m"
feed "$url";
else
echo -e "\\n \\e[04mUsage\\e[00m\\n\\n \\e[01;37m\$ deef \\e[01;31m<bookmark>\\e[00m\\n\\n \\e[04mCurrently saved bookmarks\\e[00m\\n";
for i in $(find $FEED_BOOKMARKS -maxdepth 1 -type f);
do echo -e " \\e[01;36m\\e[04m$(basename $i)\\e[00m";
done;
echo -e "\\n \\e[04mSee also\\e[00m\\n\\n \\e[01;37m\$ feed\\e[00m\\n";
fi;
It's a very simple rss reader written in bash with two functions.
The first one:
$ feed <url> <new bookmark?>
prints the parsed content of <url> and possibly save the url as <new bookmark?>, if specified.
For example:
$ feed http://www.archlinux.org/feeds/news/
or
$ feed http://www.archlinux.org/feeds/news/ archnews
The second one:
$ deef <bookmark>
reads the url previously saved as <bookmark> and prints its content.
For example:
$deef archnews
I'd like you to test it and suggest whatever you want
The parser is very very simple.
**EDIT**
A better version of this script is this.
Last edited by grufo (2012-08-15 02:41:19)

Answer 1

skanky wrote:
Break the '' :-
sed 's/abc/'$VARIABLE'/'
You can split the sed script to a separate file, which would mean that you could have different types of file or streams that could be converted...should you wish.
Thank you
So, if you prefer a version with formatting variables...
#!/bin/bash
if [ ! -n "$FEED_BOOKMARKS" ]; then export FEED_BOOKMARKS=$HOME/.feed_bookmarks; fi
if [ ! -d "$FEED_BOOKMARKS" ]; then mkdir -p $FEED_BOOKMARKS; fi
feed() {
if [ ! -d $FEED_BOOKMARKS ]; then mkdir $FEED_BOOKMARKS; fi
if [ ! -n "$1" ]; then
echo -e "\\n \\e[04mUsage\\e[00m\\n\\n \\e[01;37m\$ feed \\e[01;31m<url>\\e[00m \\e[01;31m<new bookmark?>\\e[00m\\n\\n \\e[04mSee also\\e[00m\\n\\n \\e[01;37m\$ deef\\e[00m\\n"
return 1;
fi
local rss_source="$(curl --silent $1 | sed -e ':a;N;$!ba;s/\n/ /g')";
if [ ! -n "$rss_source" ]; then
echo "The feed is empty";
return 1;
fi
# THE RSS PARSER
# Formatting
local f_title="\\\\e[01;31m"
local f_descr="\\\\e[00;37m"
local f_ref="\\\\e[01;36m"
local f_bold="\\\\e[01;36m"
local f_italic="\\\\e[41;37m"
local f_underline="\\\\e[4;37m"
local f_code="\\\\e[00m"
local f_linklabel="\\\\e[01;31m"
local f_linkurl="\\\\e[04m"
local f_formatchrs="\\\\e[01;34m"
# The characters "£, §" are used as metacharacters. They should not be encountered in a feed...
echo -e "$(echo $rss_source | \
sed -e 's/&amp;/\&/g
s/&lt;\|&#60;/</g
s/&gt;\|&#62;/>/g
s/<\/a>/£/g
s/href\=\"/§/g
s/<title>/\\n\\n\\n :: '$f_title'/g; s/<\/title>/\\e[00m ::\\n/g
s/<link>/ [ '$f_ref'/g; s/<\/link>/\\e[00m ]/g
s/<description>/\\n\\n'$f_descr'/g; s/<\/description>/\\e[00m\\n\\n/g
s/<p\( [^>]*\)\?>\|<br\s*\/\?>/\n/g
s/<b\( [^>]*\)\?>\|<strong\( [^>]*\)\?>/'$f_bold'/g; s/<\/b>\|<\/strong>/'$f_descr'/g
s/<i\( [^>]*\)\?>\|<em\( [^>]*\)\?>/'$f_italic'/g; s/<\/i>\|<\/em>/'$f_descr'/g
s/<u\( [^>]*\)\?>/'$f_underline'/g; s/<\/u>/'$f_descr'/g
s/<code\( [^>]*\)\?>/'$f_code'/g; s/<\/code>/'$f_descr'/g
s/<a[^§]*§\([^\"]*\)\"[^>]*>\([^£]*\)[^£]*£/'$f_linklabel'\2'$f_descr' '$f_formatchrs'['$f_descr' '$f_linkurl'\1'$f_descr''$f_formatchrs' ]'$f_descr'/g
s/<li\( [^>]*\)\?>/\n '$f_formatchrs'*'$f_descr' /g
s/<!\[CDATA\[\|\]\]>//g
s/\|>\s*<//g
s/ *<[^>]\+> */ /g
s/[<>£§]//g')\n\n";
# END OF THE RSS PARSER
if [ -n "$2" ]; then
echo "$1" > $FEED_BOOKMARKS/$2
echo -e "\\n\\t\\e[01;37m==> \\e[01;31mBookmark saved as \\e[01;36m\\e[04m$2\\e[00m\\e[01;37m <==\\e[00m\\n"
fi
deef() {
if test -n "$1"; then
if [ ! -r "$FEED_BOOKMARKS/$1" ]; then
echo -e "\\n \\e[01;31mBookmark \\e[01;36m\\e[04m$1\\e[00m\\e[01;31m not found.\\e[00m\\n\\n \\e[04mType:\\e[00m\\n\\n \\e[01;37m\$ deef\\e[00m (without arguments)\\n\\n to get the complete list of all currently saved bookmarks.\\n";
return 1;
fi
local url="$(cat $FEED_BOOKMARKS/$1)";
if [ ! -n "$url" ]; then
echo "The bookmark is empty";
return 1;
fi
echo -e "\\n\\t\\e[01;37m==> \\e[01;31m$url\\e[01;37m <==\\e[00m"
feed "$url";
else
echo -e "\\n \\e[04mUsage\\e[00m\\n\\n \\e[01;37m\$ deef \\e[01;31m<bookmark>\\e[00m\\n\\n \\e[04mCurrently saved bookmarks\\e[00m\\n";
for i in $(find $FEED_BOOKMARKS -maxdepth 1 -type f);
do echo -e " \\e[01;36m\\e[04m$(basename $i)\\e[00m";
done;
echo -e "\\n \\e[04mSee also\\e[00m\\n\\n \\e[01;37m\$ feed\\e[00m\\n";
fi;