From 1920eb19f0efd0477c171b4eeda6b979fdefbe18 Mon Sep 17 00:00:00 2001
From: NerdyPepper <akshayoppiliappan@gmail.com>
Date: Tue, 13 Feb 2018 17:19:15 +0530
Subject: Add ligature plugins, installation instructions

---
 ligature_plugins/README.md   | 33 +++++++++++++++++++++++++++++++++
 ligature_plugins/haskell.vim |  2 +-
 ligature_plugins/python.vim  | 37 +++++++++++++++++++++++++++++++++++++
 3 files changed, 71 insertions(+), 1 deletion(-)
 create mode 100644 ligature_plugins/README.md
 create mode 100644 ligature_plugins/python.vim

diff --git a/ligature_plugins/README.md b/ligature_plugins/README.md
new file mode 100644
index 0000000..a17c67b
--- /dev/null
+++ b/ligature_plugins/README.md
@@ -0,0 +1,33 @@
+# Ligatures and Unicode substitution
+
+These features are supported *in vim only*.
+
+### Installation
+
+Symlink the required vim plugins to
+
+ - `~/.vim/after/syntax/` (vim)
+ - `~/.config/nvim/after/syntax/` (neovim)
+
+ ```shell
+ #vim
+ cd ~/scientifica/ligature_plugins/
+ for i in `ls *.vim`; do
+ ln -sf ~/scientifica/ligature_plugins/"$i" ~/.vim/after/syntax/"$i"
+ done
+
+ #nvim
+ cd ~/scientifica/ligature_plugins/
+ for i in `ls *.vim`; do
+ ln -sf ~/scientifica/ligature_plugins/"$i" ~/.config/nvim/after/syntax/"$i"
+ done
+ ```
+
+Haskell in vim with scientifica:
+![haskell_ligs](https://0x0.st/sT8a.png)
+
+Credits go to [romeovs](https://github.com/romeovs/) for the haskell plugin.  
+Credits go to [ehamberg](https://github.com/ehamberg/vim-cute-python) for the python plugin.
+
+Both plugins have been modified (haskell.vim especially) to play well with scientifica.  
+If you need ligatures for other languages, just open an issue, with the language and the ligature sequence.
diff --git a/ligature_plugins/haskell.vim b/ligature_plugins/haskell.vim
index b556b0a..e582dc7 100644
--- a/ligature_plugins/haskell.vim
+++ b/ligature_plugins/haskell.vim
@@ -3,7 +3,7 @@
 
 
 " set correct conceal
-set conceallevel=1
+setlocal conceallevel=1
 
 " lambda's
 syntax match hsLambda "\\" conceal cchar=λ
diff --git a/ligature_plugins/python.vim b/ligature_plugins/python.vim
new file mode 100644
index 0000000..3542ae3
--- /dev/null
+++ b/ligature_plugins/python.vim
@@ -0,0 +1,37 @@
+" This is a fork of vim-cute-python
+" with a few character replacements to
+" play well with scientifica
+
+" we need the conceal feature (vim ≥ 7.3)
+if !has('conceal')
+    finish
+endif
+
+" remove the keywords. we'll re-add them below
+syntax clear pythonOperator
+
+syntax match pythonOperator "\<is\>"
+
+syntax match pyNiceOperator "\<in\>" conceal cchar=∈
+syntax match pyNiceOperator "\<or\>" conceal cchar=∨
+syntax match pyNiceOperator "\<and\>" conceal cchar=∧
+" include the space after “not” – if present – so that “not a” becomes “¬a”.
+" also, don't hide “not” behind  ‘¬’ if it is after “is ”.
+syntax match pyNiceOperator "<=" conceal cchar=≤
+syntax match pyNiceOperator ">=" conceal cchar=≥
+" only conceal “==” if alone, to avoid concealing SCM conflict markers
+syntax match pyNiceOperator "=\@<!===\@!" conceal cchar=≡
+syntax match pyNiceOperator "!=" conceal cchar=≠
+
+syntax keyword pyNiceOperator sum conceal cchar=∑
+syntax match pyNiceOperator "\<\%(math\.\)\?sqrt\>" conceal cchar=√
+syntax match pyNiceKeyword "\<\%(math\.\)\?pi\>" conceal cchar=π
+
+syntax keyword pyNiceStatement lambda conceal cchar=λ
+
+hi link pyNiceOperator Operator
+hi link pyNiceStatement Statement
+hi link pyNiceKeyword Keyword
+hi! link Conceal Operator
+
+setlocal conceallevel=1
-- 
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