feat: add postfix snippets, also undo the weird error to init.lua

Author: evesdropper

lua/luasnip-latex-snippets/init.lua

@@ -1,4 +1,2 @@
-{
-  [""] = {},
-  all = {}
-}
+snippet_path = debug.getinfo(1).source:sub(2):gsub("init.lua", "luasnippets")
+require("luasnip.loaders.from_lua").lazy_load({ paths = snippet_path })

lua/luasnip-latex-snippets/luasnippets/tex/math-commands.lua

@@ -36,6 +36,7 @@ local tex = require("luasnip-latex-snippets.luasnippets.tex.utils.conditions")
 local auto_backslash_snippet = require("luasnip-latex-snippets.luasnippets.tex.utils.scaffolding").auto_backslash_snippet
 local symbol_snippet = require("luasnip-latex-snippets.luasnippets.tex.utils.scaffolding").symbol_snippet
 local single_command_snippet = require("luasnip-latex-snippets.luasnippets.tex.utils.scaffolding").single_command_snippet
+local postfix_snippet = require("luasnip-latex-snippets.luasnippets.tex.utils.scaffolding").postfix_snippet
 
 M = {
     -- superscripts
@@ -339,4 +340,91 @@ for k, v in pairs(single_command_math_specs) do
 end
 vim.list_extend(M, single_command_math_snippets)
 
+local postfix_math_specs = {
+    mbb = {
+        context = {
+            name = "mathbb",
+            dscr =  "math blackboard bold",
+        },
+        command = {
+            pre = [[\mathbb{]],
+            post = [[}]],
+        }
+    },
+    mcal = {
+        context = {
+            name = "mathcal",
+            dscr =  "math calligraphic",
+        },
+        command = {
+            pre = [[\mathcal{]],
+            post = [[}]],
+        }
+    },
+    mscr = {
+        context = {
+            name = "mathscr",
+            dscr =  "math script",
+        },
+        command = {
+            pre = [[\mathscr{]],
+            post = [[}]],
+        },
+    },
+    mfr = {
+        context = {
+            name = "mathfrak",
+            dscr =  "mathfrak",
+        },
+        command = {
+            pre = [[\mathfrak{]],
+            post = [[}]],
+        },
+    },
+    hat = {
+		context = {
+			name = "hat",
+			dscr = "hat",
+		},
+		command = {
+            pre = [[\hat{]],
+            post = [[}]],
+        }
+	},
+	bar = {
+		context = {
+			name = "bar",
+			dscr = "bar (overline)",
+		},
+		command = {
+            pre = [[\overline{]],
+            post = [[}]]
+        }
+	},
+	tld = {
+		context = {
+			name = "tilde",
+            priority = 500,
+			dscr = "tilde",
+		},
+		command = {
+            pre = [[\tilde{]],
+            post = [[}]]
+        }
+	}
+}
+
+local postfix_math_snippets = {}
+for k, v in pairs(postfix_math_specs) do
+table.insert(
+    postfix_math_snippets,
+    postfix_snippet(
+        vim.tbl_deep_extend("keep", { trig = k, snippetType = "autosnippet" }, v.context),
+        v.command,
+        { condition = tex.in_math }
+    )
+)
+end
+vim.list_extend(M, postfix_math_snippets)
+
 return M

lua/luasnip-latex-snippets/luasnippets/tex/utils/scaffolding.lua

@@ -32,6 +32,22 @@ local autosnippet = ls.extend_decorator.apply(s, { snippetType = "autosnippet" }
 
 M = {}
 
+-- postfix helper function - generates dynamic node
+local generate_postfix_dynamicnode = function(_, parent, _, user_arg1, user_arg2)
+    local capture = parent.snippet.env.POSTFIX_MATCH
+    if #capture > 0 then
+        return sn(nil, fmta([[
+        <><><><>
+        ]],
+        {t(user_arg1), t(capture), t(user_arg2), i(0)}))
+    else
+        local visual_placeholder = parent.snippet.env.SELECT_RAW
+        return sn(nil, fmta([[
+        <><><><>
+        ]],
+        {t(user_arg1), i(1, visual_placeholder), t(user_arg2), i(0)}))
+    end
+end
 
 -- visual util to add insert node - thanks ejmastnak!
 M.get_visual = function(args, parent)
@@ -106,4 +122,18 @@ M.single_command_snippet = function(context, command, opts, ext)
 	)
 end
 
+M.postfix_snippet = function (context, command, opts)
+    opts = opts or {}
+	if not context.trig then
+		error("context doesn't include a `trig` key which is mandatory", 2)
+	end
+	if not context.trig then
+		error("context doesn't include a `trig` key which is mandatory", 2)
+	end
+	context.dscr = context.dscr
+	context.name = context.name or context.dscr
+    context.docstring = command.pre .. [[(POSTFIX_MATCH|VISUAL|<1>)]] .. command.post
+    return postfix(context, {d(1, generate_postfix_dynamicnode, {}, { user_args = {command.pre, command.post} })}, opts)
+end
+
 return M