In many countries with a Muslim majority the constitution mentions at least Islam or both that and Sharia. And inclusion of the latter is often a plank of some Islamist parties e.g.
Contrary to Egypt, there is no provision in Tunisia making of the Sharia a formal source of legislation. In the 1959 Constitution, Article 1 provided: ‘Tunisia is a free, independent and sovereign state; its religion is Islam, its language is Arabic and its regime is the Republic’. [...]
Under the pressure of its opponents and because of its political pragmatism, the Islamist party Ennahda, which lead the government since the 2011 elections, renounced making any mention of Sharia in the Constitution. It does not mean, however, that Ennahda renounced its project of the Islamic moralization of the society, but as in the Erdoğan’s Turkey, it prefers to substitute to symbolic moves a more gradualist approach using the de facto acceptance of Sharia as a source of legislation and case-law.
So, I'd like to know: what (if any) is the equivalent of Sharia in the Hindutva political movement? And do they push for an overt inclusion e.g. in the constitution, or do they follow a gradualist/stealth approach?