add mathsymbindex package

Used to define math operators with automatic indexing
    Still in development, but fully working by now

PyTeX

@@ -1 +1 @@
-Subproject commit 494c43e52bae7cb2bc2cf15468cda8981a7ec8a3
+Subproject commit c8deda5af851b3072a9e235fc5fe317e70cf50e3

src/math/mathsymbindex.pysty3

@@ -0,0 +1,118 @@
+__HEADER__(Declaring of math symbols with automatic indexing)
+
+\RequirePackage{imakeidx}
+\RequirePackage{amsmath}
+\RequirePackage{xparse}
+
+
+% Keys used for declaring symbols
+\keys_define:nn { symbol }
+  {
+    operator      .tl_set:N   = \l_symbol_operator_tl,
+    operator      .default:n  = \use:n,
+    formula       .tl_set:N   = \l_symbol_formula_tl,
+    formula       .default:n  = \c_novalue_tl,
+    ordered       .tl_set:N   = \l_symbol_ordered_tl,
+    ordered       .default:n  = \c_novalue_tl,
+    description   .tl_set:N   = \l_symbol_description_tl,
+    description   .default:n  = \c_novalue_tl,
+    group         .tl_set:N   = \l_symbol_group_tl,
+    group         .default:n  = \c_novalue_tl
+  }
+
+% Core macro not be used publicly directly. Usage:
+  % #1 = indexname / group
+  % #2 = symbolname,
+  % #3 = description
+  % #4 = operator to apply (one argument) - can be \use:n for identity
+  % #5 = substitution when called
+  % #6 = ordering in index
+\cs_new_protected:Nn\symbol_define:nnnnnn
+  {
+    \bool_new:c { used_#2 }
+    \cs_new_protected:cn { symbol_#2: }
+      {
+        #4{#5}
+        \bool_if:cF { used_#2 }
+        {
+          \index[#1]
+            {
+              #6
+              @
+              $#4{#5}$
+              #3
+            }
+          \bool_gset_true:c { used_#2 }
+        }
+      }
+    \exp_args:Nc\gdef{#2}
+      {
+        \use:c { symbol_#2: }
+      }
+  }
+\cs_generate_variant:Nn\symbol_define:nnnnnn { V n V V V V }
+
+
+% Main package interface
+\NewDocumentCommand{\DeclareSymbol}{ O{} m}
+  {
+    \keys_set:nn{ symbol }
+      {
+        operator,
+        formula,
+        ordered,
+        description,
+        group
+      }
+    \keys_set:nn{ symbol }{#1}
+    \tl_if_eq:NnTF\l_symbol_description_tl{\c_novalue_tl}
+      {
+        \tl_set:Nn\l_symbol_description_tl { \c_empty_tl }
+      }
+      {
+        \tl_put_left:Nn\l_symbol_description_tl { ,\c_space_tl }
+      }
+    \tl_if_eq:NnT\l_symbol_formula_tl{\c_novalue_tl}
+      {
+        \tl_set:Nn\l_symbol_formula_tl {#2}
+      }
+    \tl_if_eq:NnT\l_symbol_ordered_tl{\c_novalue_tl}
+      {
+        \tl_set:Nn\l_symbol_ordered_tl {#2}
+      }
+    \symbol_define:VnVVVV
+        \l_symbol_group_tl
+        {
+          #2
+        }
+        \l_symbol_description_tl
+        \l_symbol_operator_tl
+        \l_symbol_formula_tl
+        \l_symbol_ordered_tl
+  }
+
+
+%% Wrapper commands specific for defining categories
+
+\NewDocumentCommand{\category}{ m }
+  {
+    \operatorname{\textbf{#1}}
+  }
+
+
+\NewDocumentCommand{\DeclareCategory}{ O{} m }
+  {
+    \DeclareSymbol[group = categories, #1]{#2}
+  }
+
+
+\NewDocumentCommand{\DeclareSimpleCategory}{ o m }
+  {
+    \IfValueTF{#1}
+    {
+      \DeclareCategory[operator = \category, description = #1]{#2}
+    }
+    {
+      \DeclareCategory[operator = \category]{#2}
+    }
+  }