Hide parts of a line from LaTeX output

Question

Is there a way to hide parts of a line from the LaTeX output?

For whole lines, this works:

\begin{code}
foo : Tm Γ t
\end{code}
\begin{code}[hide]
foo = someHiddenDefinitionOfFoo
\end{code}

but what if I want to hide parts of a line, e.g. parts of a type signature? For example, suppose I have this Agda signature:

sub-⊢*⊇ : ∀ {Γ Δ Θ t} (σ : Γ ⊢* Δ) (Δ⊇Θ : Δ ⊇ Θ) (e : Tm Θ t) →
  sub (σ ⊢*⊇ Δ⊇Θ) e ≡ sub σ (ren Δ⊇Θ e)

but I'd like it to look like this in the LaTeX output:

sub-⊢*⊇ : ∀ σ Δ⊇Θ e → sub (σ ⊢*⊇ Δ⊇Θ) e ≡ sub σ (ren Δ⊇Θ e)

Is this possible?

Answer 1

The most robust approach for doing this kind of thing is to use anonymous modules for the arguments you want to hide:

sub-⊢*⊇ : ∀ {Γ Δ Θ t} (σ : Γ ⊢* Δ) (Δ⊇Θ : Δ ⊇ Θ) (e : Tm Θ t) →
  sub (σ ⊢*⊇ Δ⊇Θ) e ≡ sub σ (ren Δ⊇Θ e)

thus becomes

module _ {Γ Δ Θ t} where

 sub-⊢*⊇ : (σ : Γ ⊢* Δ) (Δ⊇Θ : Δ ⊇ Θ) (e : Tm Θ t) →
   sub (σ ⊢*⊇ Δ⊇Θ) e ≡ sub σ (ren Δ⊇Θ e)

If you're willing to use a very basic sed script to postprocess the LaTeX file to erase simple {var} arguments, you should be able to get your intended goal with something like:

module _ {Γ Δ Θ t} where

 sub-⊢*⊇ : ∀ σ Δ⊇Θ e → sub {Γ} (σ ⊢*⊇ Δ⊇Θ) e ≡ sub σ (ren {Δ} {Θ} Δ⊇Θ e)

Answer 2

The verbatim package provides a comment environment.

\begin{comment}
    Something not taken into account
\end{comment}