Add tab triggered calculation

requirements.txt

@@ -0,0 +1,2 @@
+sympy
+latex2sympy2

tex.snippets

@@ -200,6 +200,42 @@ snip.rv = subprocess.check_output(['wolframscript', '-code', code])
 `
 endsnippet
 
+priority 10000
+context "math()"
+snippet '^(.*(?:= |\$))(.*[^\s=])\s*$' "latex-sympy-calculator-expression" wr
+`!p
+import re
+from latex2sympy2 import latex2latex, latex2sympy, var, variances, set_variances, set_real, latex
+from sympy import simplify
+prefix = match.group(1)
+code = match.group(2)
+reg = re.match(r'^(.*)\&\s*=(?:.*)$', prefix)
+sep = '\n' + ' ' * len(reg.group(1)) + '&= ' if reg else ' = '
+try:
+	snip.rv = prefix + code + sep + latex(simplify(latex2sympy(code).subs(variances)))
+except:
+	snip.rv = prefix + code + sep
+`
+endsnippet
+
+priority 10000
+context "math()"
+snippet '^(.*(?:= |\$))(.*)=\s*$' "latex-sympy-calculator-numeric" wr
+`!p
+import re
+from latex2sympy2 import latex2latex, latex2sympy, var, variances, set_variances, set_real, latex
+from sympy import simplify
+prefix = match.group(1)
+code = match.group(2)
+reg = re.match(r'^(.*)\&\s*=(?:.*)$', prefix)
+sep = '\n' + ' ' * len(reg.group(1)) + '&= ' if reg else ' = '
+try:
+	snip.rv = prefix + code + sep + latex(simplify(latex2sympy(code).subs(variances).doit().doit()).evalf(subs=variances))
+except:
+	snip.rv = prefix + code + sep
+`
+endsnippet
+
 snippet == "equals" iA
 &= $1 \\\\
 endsnippet