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TiddlyWiki5/core/language/en-GB/Help/fetch.tid
Jermolene 0d0ece6377 Add new "fetch" command
Like the load command except retrieves the file over HTTP/HTTPS.

Allows experimentation with server-side twederation

This is a cleaned up version of code that I wrote last year at TWEUM
2016 @inmysocks @pmario @twMat @xcazin
2017-02-18 13:33:41 +00:00

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title: $:/language/Help/fetch
description: Fetch tiddlers from wiki by URL
Fetch one or more files over HTTP/HTTPS, and import the tiddlers matching a filter, optionally transforming the incoming titles.
```
--fetch file <url> <import-filter> <transform-filter>
--fetch files <url-filter> <import-filter> <transform-filter>
```
With the "file" variant only a single file is fetched and the first parameter is the URL of the file to read.
With the "files" variant, multiple files are fetched and the first parameter is a filter yielding a list of URLs of the files to read. For example, given a set of tiddlers tagged "remote-server" that have a field "url" the filter `[tag[remote-server]get[url]]` will retrieve all the available URLs.
The `<import-filter>` parameter specifies a filter determining which tiddlers are imported. It defaults to `[all[tiddlers]]` if not provided.
The `<transform-filter>` parameter specifies an optional filter that transforms the titles of the imported tiddlers. For example, `[addprefix[$:/myimports/]]` would add the prefix `$:/myimports/` to each title.
Preceding the `--fetch` command with `--verbose` will output progress information during the import.
Note that TiddlyWiki will not fetch an older version of an already loaded plugin.
The following example retrieves all the non-system tiddlers from http://tiddlywiki.com and saves them to a JSON file:
```
tiddlywiki --verbose --fetch file "http://tiddlywiki.com/" "[!is[system]]" "" --rendertiddler "$:/core/templates/exporters/JsonFile" output.json text/plain "" exportFilter "[!is[system]]"
```