feat(math): add snippets

- left right brackets (alternative to 'lr{')
- sequence
- absolute value

Author: iurimateus

lua/luasnip-latex-snippets/math_i.lua

@@ -60,6 +60,16 @@ local math_i = {
     { trig = "lra", name = "leftangle rightangle" },
     "\\left< ${1:${TM_SELECTED_TEXT}} \\right>$0"
   ),
+
+  ls.parser.parse_snippet(
+    { trig = "lrb", name = "left\\{ right\\}" },
+    "\\left\\{ ${1:${TM_SELECTED_TEXT}} \\right\\\\} $0"
+  ),
+
+  ls.parser.parse_snippet(
+    { trig = "sequence", name = "Sequence indexed by n, from m to infinity" },
+    "(${1:a}_${2:n})_{${2:n}=${3:m}}^{${4:\\infty}}"
+  ),
 }
 
 return math_i

lua/luasnip-latex-snippets/math_iA.lua

@@ -132,7 +132,6 @@ local math_iA = {
   ls.parser.parse_snippet({ trig = ">=", name = "geq" }, "\\ge "),
   ls.parser.parse_snippet({ trig = "invs", name = "inverse" }, "^{-1}"),
   ls.parser.parse_snippet({ trig = "~~", name = "~" }, "\\sim "),
-  -- ls.parser.parse_snippet({ trig = "lrb", name = "left\\{ right\\}" }, "\\left\\{ ${1:${TM_SELECTED_TEXT}} \\right\\} $0"),
   ls.parser.parse_snippet({ trig = "conj", name = "conjugate" }, "\\overline{$1}$0"),
 }
 

lua/luasnip-latex-snippets/math_wA_no_backslash.lua

@@ -14,6 +14,11 @@ local math_wA_no_backslash = {
     { trig = "fun", name = "function map" },
     "f \\colon $1 \\R \\to \\R \\colon $0"
   ),
+
+  ls.parser.parse_snippet(
+    { trig = "abs", name = "absolute value \\abs{}" },
+    "\\abs{${1:${TM_SELECTED_TEXT}}}$0"
+  ),
 }
 
 return math_wA_no_backslash