When you jump to a quickfix/location list entry using any of the quickfix
commands (e.g. |:cc|, |:cnext|, |:cprev|, etc.), that entry becomes the
currently selected entry. The index of the currently selected entry in a
quickfix/location list can be obtained using the getqflist()/getloclist()
functions. Examples: >
	echo getqflist({'idx' : 0}).idx
	echo getqflist({'id' : qfid, 'idx' : 0}).idx
	echo getloclist(2, {'idx' : 0}).idx
<
For a new quickfix list, the first entry is selected and the index is 1.  Any
entry in any quickfix/location list can be set as the currently selected entry
using the setqflist() function. Examples: >
	call setqflist([], 'a', {'idx' : 12})
	call setqflist([], 'a', {'id' : qfid, 'idx' : 7})
	call setloclist(1, [], 'a', {'idx' : 7})
<
							*quickfix-size*
You can get the number of entries (size) in a quickfix and a location list
using the |getqflist()| and |getloclist()| functions respectively. Examples: >
	echo getqflist({'size' : 1})
	echo getloclist(5, {'size' : 1})
<
							*quickfix-context*
Any Vim type can be associated as a context with a quickfix or location list.
The |setqflist()| and the |setloclist()| functions can be used to associate a
context with a quickfix and a location list respectively. The |getqflist()|
and the |getloclist()| functions can be used to retrieve the context of a
quickfix and a location list respectively. This is useful for a Vim plugin
dealing with multiple quickfix/location lists.
Examples: >

	let somectx = {'name' : 'Vim', 'type' : 'Editor'}
	call setqflist([], 'a', {'context' : somectx})
	echo getqflist({'context' : 1})

	let newctx = ['red', 'green', 'blue']
	call setloclist(2, [], 'a', {'id' : qfid, 'context' : newctx})
	echo getloclist(2, {'id' : qfid, 'context' : 1})
<
							*quickfix-parse*
You can parse a list of lines using 'errorformat' without creating or
modifying a quickfix list using the |getqflist()| function. Examples: >
	echo getqflist({'lines' : ["F1:10:Line10", "F2:20:Line20"]})
	echo getqflist({'lines' : systemlist('grep -Hn quickfix *')})
This returns a dictionary where the "items" key contains the list of quickfix
entries parsed from lines. The following shows how to use a custom
'errorformat' to parse the lines without modifying the 'errorformat' option: >
	echo getqflist({'efm' : '%f#%l#%m', 'lines' : ['F1#10#Line']})
<

EXECUTE A COMMAND IN ALL THE BUFFERS IN QUICKFIX OR LOCATION LIST:
							*:cdo*
:cdo[!] {cmd}		Execute {cmd} in each valid entry in the quickfix list.
			It works like doing this: >
				:cfirst
				:{cmd}
				:cnext
				:{cmd}
				etc.
<			When the current file can't be |abandon|ed and the [!]
			is not present, the command fails.
			When going to the next entry fails execution stops.
			The last buffer (or where an error occurred) becomes
			the current buffer.
			{cmd} can contain '|' to concatenate several commands.

			Only valid entries in the quickfix list are used.
			A range can be used to select entries, e.g.: >
				:10,$cdo cmd
<			To skip entries 1 to 9.

			Note: While this command is executing, the Syntax
			autocommand event is disabled by adding it to
			'eventignore'.  This considerably speeds up editing
			each buffer.
			Also see |:bufdo|, |:tabdo|, |:argdo|, |:windo|,
			|:ldo|, |:cfdo| and |:lfdo|.

							*:cfdo*
:cfdo[!] {cmd}		Execute {cmd} in each file in the quickfix list.
			It works like doing this: >
				:cfirst
				:{cmd}
				:cnfile
				:{cmd}
				etc.
<			Otherwise it works the same as `:cdo`.

							*:ldo*
:ld[o][!] {cmd}		Execute {cmd} in each valid entry in the location list
			for the current window.
			It works like doing this: >
				:lfirst
				:{cmd}
				:lnext
				:{cmd}
				etc.
<			Only valid entries in the location list are used.
			Otherwise it works the same as `:cdo`.

							*:lfdo*
:lfdo[!] {cmd}		Execute {cmd} in each file in the location list for
			the current window.
			It works like doing this: >
				:lfirst
				:{cmd}
				:lnfile
				:{cmd}
				etc.
<			Otherwise it works