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.TH "URLWATCH-INTRO" "7" "May 03, 2023" "" "urlwatch"
.SH NAME
urlwatch-intro \- Introduction to basic urlwatch usage
.SH QUICK START
.INDENT 0.0
.IP 1. 3
Run \fBurlwatch\fP once to migrate your old data or start fresh
.IP 2. 3
Use \fBurlwatch \-\-edit\fP to customize jobs and filters (\fBurls.yaml\fP)
.IP 3. 3
Use \fBurlwatch \-\-edit\-config\fP to customize settings and reporters (\fBurlwatch.yaml\fP)
.IP 4. 3
Add \fBurlwatch\fP to your crontab (\fBcrontab \-e\fP) to monitor webpages periodically
.UNINDENT
.sp
The checking interval is defined by how often you run \fBurlwatch\fP\&. You
can use e.g.\ \fI\%crontab.guru\fP <\fBhttps://crontab.guru\fP> to figure out the
schedule expression for the checking interval, we recommend not more
often than 30 minutes (this would be \fB*/30 * * * *\fP). If you have
never used cron before, check out the \fI\%crontab command
help\fP <\fBhttps://www.computerhope.com/unix/ucrontab.htm\fP>\&.
.sp
On Windows, \fBcron\fP is not installed by default. Use the \fI\%Windows Task
Scheduler\fP <\fBhttps://en.wikipedia.org/wiki/Windows_Task_Scheduler\fP>
instead, or see \fI\%this StackOverflow
question\fP <\fBhttps://stackoverflow.com/q/132971/1047040\fP> for
alternatives.
.SH HOW IT WORKS
.sp
Every time you run \fBurlwatch(1)\fP, it:
.INDENT 0.0
.IP \(bu 2
retrieves the output of each job and filters it
.IP \(bu 2
compares it with the version retrieved the previous time (\(dqdiffing\(dq)
.IP \(bu 2
if it finds any differences, it invokes enabled reporters (e.g.
text reporter, e\-mail reporter, ...) to notify you of the changes
.UNINDENT
.SH JOBS AND FILTERS
.sp
Each website or shell command to be monitored constitutes a \(dqjob\(dq.
.sp
The instructions for each such job are contained in a config file in the \fI\%YAML
format\fP <\fBhttps://yaml.org/spec/\fP>\&. If you have more than one job, you separate them with a line
containing only \fB\-\-\-\fP\&.
.sp
You can edit the job and filter configuration file using:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
urlwatch \-\-edit
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
If you get an error, set your \fB$EDITOR\fP (or \fB$VISUAL\fP) environment
variable in your shell, for example:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
export EDITOR=/bin/nano
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
While you can edit the YAML file manually, using \fB\-\-edit\fP will
do sanity checks before activating the new configuration file.
.SS Kinds of Jobs
.sp
Each job must have exactly one of the following keys, which also
defines the kind of job:
.INDENT 0.0
.IP \(bu 2
\fBurl\fP retrieves what is served by the web server (HTTP GET by default),
.IP \(bu 2
\fBnavigate\fP uses a headless browser to load web pages requiring JavaScript, and
.IP \(bu 2
\fBcommand\fP runs a shell command.
.UNINDENT
.sp
Each job can have an optional \fBname\fP key to define a user\-visible name for the job.
.sp
You can then use optional keys to finely control various job\(aqs parameters.
.sp
See \fBurlwatch\-jobs(5)\fP for detailed information on job configuration.
.SS Filters
.sp
You may use the \fBfilter\fP key to select one or more \fI\%Filters\fP to apply to
the data after it is retrieved, for example to:
.INDENT 0.0
.IP \(bu 2
select HTML: \fBcss\fP, \fBxpath\fP, \fBelement\-by\-class\fP, \fBelement\-by\-id\fP, \fBelement\-by\-style\fP, \fBelement\-by\-tag\fP
.IP \(bu 2
make HTML more readable: \fBhtml2text\fP, \fBbeautify\fP
.IP \(bu 2
make PDFs readable: \fBpdf2text\fP
.IP \(bu 2
make JSON more readable: \fBformat\-json\fP
.IP \(bu 2
make iCal more readable: \fBical2text\fP
.IP \(bu 2
make binary readable: \fBhexdump\fP
.IP \(bu 2
just detect changes: \fBsha1sum\fP
.IP \(bu 2
edit text: \fBgrep\fP, \fBgrepi\fP, \fBstrip\fP, \fBsort\fP, \fBstriplines\fP
.UNINDENT
.sp
These filters can be chained. As an example, after retrieving an HTML
document by using the \fBurl\fP key, you can extract a selection with the
\fBxpath\fP filter, convert this to text with \fBhtml2text\fP, use \fBgrep\fP to
extract only lines matching a specific regular expression, and then \fBsort\fP
them:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
name: \(dqSample urlwatch job definition\(dq
url: \(dqhttps://example.dummy/\(dq
https_proxy: \(dqhttp://dummy.proxy/\(dq
max_tries: 2
filter:
  \- xpath: \(aq//section[@role=\(dqmain\(dq]\(aq
  \- html2text:
      method: pyhtml2text
      unicode_snob: true
      body_width: 0
      inline_links: false
      ignore_links: true
      ignore_images: true
      pad_tables: false
      single_line_break: true
  \- grep: \(dqlines I care about\(dq
  \- sort:
\-\-\-
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
See \fBurlwatch\-filters(5)\fP for detailed information on filter configuration.
.SH REPORTERS
.sp
\fIurlwatch\fP can be configured to do something with its report besides
(or in addition to) the default of displaying it on the console.
.sp
\fI\%Reporters\fP are configured in the global configuration file:
.INDENT 0.0
.INDENT 3.5
.sp
.nf
.ft C
urlwatch \-\-edit\-config
.ft P
.fi
.UNINDENT
.UNINDENT
.sp
Examples of reporters:
.INDENT 0.0
.IP \(bu 2
\fBemail\fP (using SMTP)
.IP \(bu 2
email using \fBmailgun\fP
.IP \(bu 2
\fBslack\fP
.IP \(bu 2
\fBdiscord\fP
.IP \(bu 2
\fBpushbullet\fP
.IP \(bu 2
\fBtelegram\fP
.IP \(bu 2
\fBmatrix\fP
.IP \(bu 2
\fBpushover\fP
.IP \(bu 2
\fBstdout\fP
.IP \(bu 2
\fBxmpp\fP
.IP \(bu 2
\fBshell\fP
.UNINDENT
.sp
See \fBurlwatch\-reporters(5)\fP for reporter configuration options.
.SH SEE ALSO
.sp
\fBurlwatch(1)\fP,
\fBurlwatch\-jobs(5)\fP,
\fBurlwatch\-filters(5)\fP,
\fBurlwatch\-config(5)\fP,
\fBurlwatch\-reporters(5)\fP,
\fBcron(8)\fP
.SH COPYRIGHT
2023 Thomas Perl
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