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Motion through CamelCaseWords and underscore_notation.
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README

This is a mirror of http://www.vim.org/scripts/script.php?script_id=1905

DESCRIPTION
Vim provides many built-in motions, e.g. to move to the next word, or end of
the current word. Most programming languages use either CamelCase
("anIdentifier") or underscore_notation ("an_identifier") naming conventions
for identifiers. The best way to navigate inside those identifiers using Vim
built-in motions is the [count]f{char} motion, i.e. f{uppercase-char} or f_,
respectively. But we can make this easier: 

This plugin defines motions ',w', ',b' and ',e' (similar to 'w', 'b', 'e'),
which do not move word-wise (forward/backward), but Camel-wise; i.e. to word
boundaries and uppercase letters. The motions also work on underscore notation,
where words are delimited by underscore ('_') characters. From here on, both
CamelCase and underscore_notation entities are referred to as "words" (in double
quotes). Just like with the regular motions, a [count] can be prepended to move
over multiple "words" at once. Outside of "words" (e.g. in non-keyword
characters like // or ;), the new motions move just like the regular motions. 

Vim provides a built-in 'iw' text object called 'inner word', which works in
operator-pending and visual mode. Analog to that, this plugin defines inner
"word" motions 'i,w', 'i,b' and 'i,e', which select the "word" (or multiple
"words" if a [count] is given) where the cursor is located. 

USAGE
Use the new motions',w',',b' and ',e' in normal mode, operator-pending mode (cp.
:help operator), and visual mode. For example, type 'bc,w' to change 'Camel' in
'CamelCase' to something else. 

EXAMPLE: motions
Given the following CamelCase identifiers in a source code fragment:
    set Script31337PathAndNameWithoutExtension11=%~dpn0
    set Script31337PathANDNameWITHOUTExtension11=%~dpn0
and the corresponding identifiers in underscore_notation:
    set script_31337_path_and_name_without_extension_11=%~dpn0
    set SCRIPT_31337_PATH_AND_NAME_WITHOUT_EXTENSION_11=%~dpn0

,w moves to ([x] is cursor position): [s]et, [s]cript, [3]1337, [p]ath,
    [a]nd, [n]ame, [w]ithout, [e]xtension, [1]1, [d]pn0, dpn[0], [s]et
,b moves to: [d]pn0, [1]1, [e]xtension, [w]ithout, ...
,e moves to: se[t], scrip[t], 3133[7], pat[h], an[d], nam[e], withou[t],
    extensio[n], 1[1], dpn[0]

EXAMPLE: inner motions
Given the following identifier, with the cursor positioned at [x]:
    script_31337_path_and_na[m]e_without_extension_11

v3i,w selects script_31337_path_and_[name_without_extension_]11
v3i,b selects script_31337_[path_and_name]_without_extension_11
v3i,e selects script_31337_path_and_[name_without_extension]_11
Instead of visual mode, you can also use c3i,w to change, d3i,w to delete,
gU3i,w to upper-case, and so on. 

Source: Based on http://vim.wikia.com/wiki/Moving_through_camel_case_words by
Anthony Van Ham.
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