more work on latex snippets

.config/nvim/lua/snippets/tex.lua

@@ -4,7 +4,7 @@ local ls = require("luasnip")
 local s = ls.snippet
 -- local sn = ls.snippet_node
 -- local isn = ls.indent_snippet_node
-local t = ls.text_node
+-- local t = ls.text_node
 local i = ls.insert_node
 local f = ls.function_node
 -- local c = ls.choice_node
@@ -19,13 +19,13 @@ local f = ls.function_node
 -- local m = extras.match
 -- local n = extras.nonempty
 -- local dl = extras.dynamic_lambda
--- local fmt = require("luasnip.extras.fmt").fmt
+local fmt = require("luasnip.extras.fmt").fmt
 -- local fmta = require("luasnip.extras.fmt").fmta
 -- local conds = require("luasnip.extras.expand_conditions")
 -- local postfix = require("luasnip.extras.postfix").postfix
 -- local types = require("luasnip.util.types")
 -- local parse = require("luasnip.util.parser").parse_snippet
--- local ms = ls.multi_snippet
+local ms = ls.multi_snippet
 
 local function has_value(tab, val)
     for _, value in ipairs(tab) do
@@ -46,20 +46,48 @@ end
 
 return {
 }, {
-    s({ trig = "^beg", regTrig = true, wordTrig = false, name = "begin{} / end{}" }, {
-        t "\\begin{", i(1), t({ "}", "\t" }),
-        i(0),
-        t({ "", "\\end{" }), reference(1), t "}"
-    }),
-    s({ trig = "mk", name = "Inline Math" }, {
-        t "$", i(1), t "$", f(cond_space, 2), i(2)
-    }),
-    s({ trig = "dm", name = "Display Math" }, {
-        t({ "\\[", "\t" }),
-        i(1),
-        t({ "", ".\\]" })
-    }),
-    s({ trig = "([A-Za-z])(%d)", regTrig = true, wordTrig = false, name = "Auto-Subscript" }, {
-        capture(1), t "_", capture(2)
-    })
+    s({ trig = "^beg", regTrig = true, wordTrig = false, name = "begin{} / end{}" }, fmt([[
+        \begin{{{}}}
+            {}
+        \end{{{}}}
+    ]], { i(1), i(0), reference(1) })),
+    s({ trig = "mk", name = "Inline Math" }, fmt([[
+        ${}${}{}
+    ]], { i(1), f(cond_space, 2), i(2) })),
+    s({ trig = "dm", name = "Display Math" }, fmt([[
+        \[
+            {}
+        .\]
+    ]], { i(1) })),
+    s({ trig = "([A-Za-z])(%d)", regTrig = true, name = "Subscript" }, fmt([[
+        {}_{}
+    ]], { capture(1), capture(2) })),
+    s({ trig = "([A-Za-z])_(%d)", regTrig = true, name = "Subscript" }, fmt([[
+        {}_{{{}}}
+    ]], { capture(1), capture(2) })),
+    s({ trig = " td", wordTrig = false, name = "Superscript" }, fmt([[
+        ^{{{}}}
+    ]], { i(1) })),
+    s({ trig = " sr", wordTrig = false, name = "Square" }, fmt([[
+        ^2
+    ]], {})),
+    s({ trig = " cb", wordTrig = false, name = "Cube" }, fmt([[
+        ^3
+    ]], {})),
+    s({ trig = " cl", wordTrig = false, name = "Complement" }, fmt([[
+        ^{{c}}
+    ]], {})),
+    s({ trig = "//", wordTrig = false, name = "Fraction" }, fmt([[
+        \\frac{{{}}}{{{}}}
+    ]], { i(1), i(2) })),
+    -- if lua patterns had conditionals this would be less of a mess
+    -- unfortunately this also expands on incomplete ^{} superscripts e.g. 4\pi^2}/
+    ms({
+        { trig = "(%d+)/" },
+        { trig = "(%d*\\?[A-Za-z]+[%^_]{?%d+}?)/", priority = 1001 },
+        common = { regTrig = true, name = "Fraction" }
+    }, fmt([[
+        \\frac{{{}}}{{{}}}
+    ]], { capture(1), i(1) })),
+    -- TODO: continue porting these snippets: https://castel.dev/post/lecture-notes-1/#fractions
 }