Shapeshift Mana Helper 

Summary:
Simply put, it just helps to notify about situations when you're stuck in caster form before it actually happens.
Thus it is most useful for feral druids that usually have low mana pools and usually are ineffective when caught in caster form.

Description:
This addon includes the following:
* A divider that is put on your mana bar. It is put so that the left portion shows the shapeshift cost and the right is the remaining mana.
It can either be a marker (rectangular thingy) or split colors (one color on the left, another one on the right)
* A mana text that shows how much mana you have left, excluding the shapeshift cost.
* Button coloring when casting that spell will prevent shapeshifting after because of lack of mana.
Can also be set to color the actual shapeshift buttons that are not set to favored.
Note: If you would like this addon to work when in bear/cat form (text and coloring), you will need to use an additional addon (see Dependency Notes below).

Supported Unit Frames (for the divider):
Standard (Blizzard's default)
Druid Bar
SimpleDruidBar
SmartyCatManaBar
X-Perl
Supported Action Bars (for the button coloring):
Standard (Blizzard's default)
Bongos2
Geist
Bartender3
TrinityBars
Note: Using the button coloring option will take over the out of range and not enough mana coloring of the bar addon.
If you'd like support for an action bar or unit frame not listed above, ask and I'll see what I can do.

Commands:
To access the option panel, use /ssmh (or /shapeshiftmanahelper).

Dependency Notes:
Optional dependancy:
Druid Bar [http://www.curse.com/downloads/details/129/]
or SimpleDruidBar [http://www.wowinterface.com/downloads/info6293-SimpleDruidBar.html]
or SmartyCat [http://files.wowace.com/cat-druid.html]
When this addon is used together with any of the above addons, the mana text and button coloring is updated in animal forms, and the divider can even be put on the addon's mana bar.

Example:
An example of how this addon works:
Say that you have 1000 mana, your bear form takes 200 mana, bear form is your favored form, and your mark of the wild takes 300 mana.
The divider will be put on the mana bar at 20% from the start, because shapeshifting to bear takes 20% of your mana.
The mana text will show 800 when you have full mana, because that's how much mana you can spend, excluding the shapeshift cost.
The mark of the wild button will be colored green (default color is green, but can be whatever) when you have between 300 and
499 mana, because if you use it when you have 400 mana, you will have 100 left, which isn't enough for shapeshifting.

If you have any suggestions, requests or found any bugs please post a comment.

Upcoming Features:
Bar texture choices and an easy way to choose between them.
Orientation (horizontal, vertical) or deplete/fill options for the divider.
Sage and Perl unitframe support.
The options panel as an external addon that is load on demand.
Perhaps more accurate values when using the SimpleDruidBar addon.
Perhaps an option to choose when to put the divider on the extra bar.
Known Issues:
X-Perl:
Split color divider doesn't grey out when afk
Split color divider doesn't "fade"