Odoo10 - How to inherit t-if tag and extend it template.

<t t-extend="template_name">
    <t t-jquery="[div,span,button,etc].class_name" t-operation="[replace,after,before]">
        <-- your code -->
    </t>
</t>
for example :
<t t-extend="website_sale.products_item">
    <t t-jquery="div.product_price" t-operation="replace">
        <-- your code -->
    </t>
</t>

how to install sassc? | Odoo12

Step 1: Clone libsass, sassc, sass-spec repositories

I'm installing those library for all users. So, I choose, /usr/local/lib directory.

cd /usr/local/lib/
sudo git clone https://github.com/sass/sassc.git --branch 3.4.2 --depth 1
sudo git clone https://github.com/sass/libsass.git --branch 3.4-stable --depth 1
sudo git clone https://github.com/sass/sass-spec.git --depth=1

You need to use sudo because /usr/local/lib directory is root writable only.

Step 2: Set the environment variable

I don't know if this step was necessary, but I did it eventually. The blog post's instruction will give error if you were not using a root shell.

echo 'SASS_LIBSASS_PATH="/usr/local/lib/libsass"' | sudo tee -a /etc/environment

This sets the SASS_LIBSASS_PATH env variable which will be used while compiling sassc to find the required libraries.

source the changed file

source /etc/environment

Step 3: Build libsass

You need to first build the libsass libraries. While you're in the /usr/local/lib directory use this command to build it

sudo make -C libsass

Step 4: Build and install sassc

After step 3 is finished, while still on the /usr/local/lib directory, use this command to build sassc.

sudo make -C sassc

This will generate sassc binary in sassc/bin/ folder. Now use this command to make the binary available globally.

sudo make -C sassc install

That's it. Now from anywhere, try sassc command to see if it's recognized.