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Hasklig - a code font with monospaced ligatures
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README.md

N.B. This is a fork of the Source Code Pro repository

Hasklig - Ligatures for Haskell code

Programming languages are limited to relatively few characters. As a result of a limited character set, combined character operators surfaced quite early, such as the widely used arrow (->), comprised of a hyphen and greater sign. It looks like an arrow if you know the analogy and squint a bit.

Composite glyphs are problematic in languages such as Haskell which utilize these complicated operators (<-, ::, =>, -<, >>= etc.) extensively (over 100 in lens alone!). The readability of this kind of complex code improves considerably with some kind of pretty printing.

Some Haskell programmers have resorted to unicode symbols in code as a solution (⇒, ← etc.). This opens a whole new can of worms. In addition to encoding/compatibility problems and all the reasons it never worked out for APL, these symbols are one-character-wide and therefore eye-strainingly small.

Hasklig solves this problem the way typographers have always solved ill-fitting characters which co-occur often: ligatures. The underlying code stays the same — only the representation changes.

Download Font Family

Hasklig

Hasklig Sample

Source Code Pro

Source Code Pro Sample

Editors and Terminals with support

  • Atom (add text-rendering: optimizeLegibility; to your .editor css.)
  • Chocolat
  • Geany
  • gEdit
  • Kate
  • Konsole
  • KWrite
  • Leksah (x64 W8 reported not working)
  • TextEdit

No support

  • Aquamacs
  • gVim (output corrupted)
  • iTerm2
  • MacVim
  • Sublime Text (Vote for the enhancement here)
  • Terminal (OSX)

To Do

  1. Contextual glyph substitution for \ → λ and . → ∘
  2. Terminal support (for example iTerm2)
  3. Discretionary or alternate ligatures for some characters (notably /= with a slash in the middle, and pretty printed less-equals and greater-equals signs)
  4. Version for C-esque languages (->, !=, ==)

Alternatives

  • Vim: vim2hs and HaskellConceal do this but a ligature takes up one less space, changing vertical alignment
  • Emacs: haskell-mode does the same as vim2hs, but emacs reportedly supports adjusting the font for ligatures so that proper spacing is maintained Instructions (note: I haven't been able to get this to work myself on OSX)