Improves vim latex editing

.config/nvim/UltiSnips/tex.snippets

@@ -1,27 +1,40 @@
-snippet fig "figure" 
+global !p
-\begin{figure}
+def math():
+    return vim.eval('vimtex#syntax#in_mathzone()') == '1'
+
+def comment(): 
+    return vim.eval('vimtex#syntax#in_comment()') == '1'
+
+def env(name):
+    [x,y] = vim.eval("vimtex#env#is_inside('" + name + "')") 
+    return x != '0' and x != '0'
+
+endglobal
+
+snippet fig "Figure environment" b
+\begin{figure}[${1:htpb}]
 	\centering
-	\includegraphics[width=.8\textwidth]{$1}
+	${2:\includegraphics[width=0.8\textwidth]{$3}}
-	\caption{$3}
+	\caption{${4:$3}}
-	\label{fig:$2}
+	\label{fig:${5:${3/\W+/-/g}}}
 \end{figure}
 endsnippet
 
-snippet tab "table"
+snippet table "Table environment" b
-\begin{table}
+\begin{table}[${1:htpb}]
 	\centering
-	\begin{tabular}{$1}
+	\caption{${2:caption}}
-		$0
+	\label{tab:${3:label}}
+	\begin{tabular}{${5:c}}
+	$0${5/((?<=.)c|l|r)|./(?1: & )/g}
 	\end{tabular}
-	\caption{$3}
-	\label{table:$2}
 \end{table}
 endsnippet
 
-snippet \beg "\begin{}...\end{}"
+snippet beg "\begin{}...\end{}" bA
-\begin{$1}
+\\begin{$1}
 	$0
-\end{$1}
+\\end{$1}
 endsnippet
 
 snippet enum "list"
@@ -29,3 +42,227 @@ snippet enum "list"
 	\item $0
 \end{enumerate}
 endsnippet
+
+snippet mk "Math" wA
+$${1}$`!p
+if t[2] and t[2][0] not in [',', '.', '?', '-', ' ']:
+    snip.rv = ' '
+else:
+    snip.rv = ''
+`$2
+endsnippet
+
+snippet dm "Math" wA
+\[
+$2
+${1:.}\] $0
+endsnippet
+
+snippet ali "Align" bA
+\begin{align*}
+	${2:${VISUAL}}
+${1:.}\end{align*}
+endsnippet
+
+context "math()"
+snippet '([A-Za-z])(\d)' "auto subscript" wrA
+`!p snip.rv = match.group(1)`_`!p snip.rv = match.group(2)`
+endsnippet
+
+context "math()"
+snippet '([A-Za-z])_(\d\d)' "auto subscript2" wrA
+`!p snip.rv = match.group(1)`_{`!p snip.rv = match.group(2)`}
+endsnippet
+
+snippet __ "subscript" iA
+_{$1}$0
+endsnippet
+
+context "math()"
+snippet sr "^2" iA
+^2
+endsnippet
+
+context "math()"
+snippet cb "^3" iA
+^3
+endsnippet
+
+context "math()"
+snippet td "superscript" iA
+^{$1}$0
+endsnippet
+
+context "math()"
+snippet // "Fraction" iA
+\\frac{$1}{$2}$0
+endsnippet
+
+context "math()"
+snippet / "Fraction" i
+\\frac{${VISUAL}}{$1}$0
+endsnippet
+
+context "math()"
+snippet '((\d+)|(\d*)(\\)?([A-Za-z]+)((\^|_)(\{\d+\}|\d))*)/' "Fraction" wrA
+\\frac{`!p snip.rv = match.group(1)`}{$1}$0
+endsnippet
+
+priority 1000
+context "math()"
+snippet '^.*\)/' "() Fraction" wrA
+`!p
+stripped = match.string[:-1]
+depth = 0
+i = len(stripped) - 1
+while True:
+	if stripped[i] == ')': depth += 1
+	if stripped[i] == '(': depth -= 1
+	if depth == 0: break;
+	i -= 1
+snip.rv = stripped[0:i] + "\\frac{" + stripped[i+1:-1] + "}"
+`{$1}$0
+endsnippet
+
+context "math()"
+snippet () "left( right)" iA
+\left( ${1:${VISUAL}} \right) $0
+endsnippet
+
+snippet lr "left( right)" i
+\left( ${1:${VISUAL}} \right) $0
+endsnippet
+
+snippet lr( "left( right)" i
+\left( ${1:${VISUAL}} \right) $0
+endsnippet
+
+snippet lr| "left| right|" i
+\left| ${1:${VISUAL}} \right| $0
+endsnippet
+
+snippet lr{ "left\{ right\}" i
+\left\\{ ${1:${VISUAL}} \right\\} $0
+endsnippet
+
+snippet lrb "left\{ right\}" i
+\left\\{ ${1:${VISUAL}} \right\\} $0
+endsnippet
+
+snippet lr[ "left[ right]" i
+\left[ ${1:${VISUAL}} \right] $0
+endsnippet
+
+snippet lra "leftangle rightangle" iA
+\left<${1:${VISUAL}} \right>$0
+endsnippet
+
+snippet sum "sum" w
+\sum_{n=${1:1}}^{${2:\infty}} ${3:a_n z^n}
+endsnippet
+
+snippet taylor "taylor" w
+\sum_{${1:k}=${2:0}}^{${3:\infty}} ${4:c_$1} (x-a)^$1 $0
+endsnippet
+
+snippet lim "limit" w
+\lim_{${1:n} \to ${2:\infty}} 
+endsnippet
+
+snippet limsup "limsup" w
+\limsup_{${1:n} \to ${2:\infty}} 
+endsnippet
+
+snippet prod "product" w
+\prod_{${1:n=${2:1}}}^{${3:\infty}} ${4:${VISUAL}} $0
+endsnippet
+
+snippet part "d/dx" w
+\frac{\partial ${1:V}}{\partial ${2:x}} $0
+endsnippet
+
+context "math()"
+snippet sq "\sqrt{}" iA
+\sqrt{${1:${VISUAL}}} $0
+endsnippet
+
+context "math()"
+snippet sr "^2" iA
+^2
+endsnippet
+
+snippet plot "Plot" w
+\begin{figure}[$1]
+	\centering
+	\begin{tikzpicture}
+		\begin{axis}[
+			xmin= ${2:-10}, xmax= ${3:10},
+			ymin= ${4:-10}, ymax = ${5:10},
+			axis lines = middle,
+		]
+			\addplot[domain=$2:$3, samples=${6:100}]{$7};
+		\end{axis}
+	\end{tikzpicture}
+	\caption{$8}
+	\label{${9:$8}}
+\end{figure}
+endsnippet
+
+priority 100
+context "math()"
+snippet '(?<!\\)(sin|cos|arccot|cot|csc|ln|log|exp|star|perp)' "ln" rwA
+\\`!p snip.rv = match.group(1)`
+endsnippet
+
+priority 300
+context "math()"
+snippet dint "integral" wA
+\int_{${1:-\infty}}^{${2:\infty}} ${3:${VISUAL}} $0
+endsnippet
+
+priority 200
+context "math()"
+snippet '(?<!\\)(arcsin|arccos|arctan|arccot|arccsc|arcsec|pi|zeta|int)' "ln" rwA
+\\`!p snip.rv = match.group(1)`
+endsnippet
+
+context "math()"
+snippet case "cases" wA
+\begin{cases}
+	$1
+\end{cases}
+endsnippet
+
+snippet ooo "\infty" iA
+\infty
+endsnippet
+
+context "math()"
+snippet hnn "hn" iA
+h[n]
+endsnippet
+
+context "math()"
+snippet htt "ht" iA
+h(t)
+endsnippet
+
+context "math()"
+snippet xnn "xn" iA
+x[n]
+endsnippet
+
+context "math()"
+snippet xtt "xt" iA
+x(t)
+endsnippet
+
+context "math()"
+snippet ynn "yn" iA
+y[n]
+endsnippet
+
+context "math()"
+snippet ytt "yt" iA
+y(t)
+endsnippet

.config/nvim/ftplugin/tex.vim

@@ -1,11 +1,9 @@
 let g:vimtex_compiler_latexmk = {
         \ 'backend': 'nvim',
-        \ 'background' : 0,
+        \ 'background' : 1,
         \ 'build_dir' : 'latex_build',
         \ 'continuous' : 1,
         \ 'options' : [
-        \   '-pdfdvi',
-        \   '-pdflatex="xelatex -shell-escape %O %S"',
         \   '-verbose',
         \   '-file-line-error',
         \   '-synctex=1',