create a script for generating images of pseudocode example snippets,…

… move scripts to their own directory

util/pseudocode_snippets.sh

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+#!/usr/bin/env bash
+
+# This script generates images of pseudocode instructions used in the book and in the solutions.
+# Maintains a hashmap mapping instruction names to LaTeX snippets used to typeset the instructions.
+# For each instruction, wraps the snippet in a codebox environment and compiles it to a PDF named after the instruction.
+# The PDF is then converted to a PNG file, ready to be referenced in a Markdown file.
+
+declare -A instructions=(
+['true']='\const{true}'
+['false']='\const{false}'
+['nil']='\nil'
+['infinity']='$\infty$'
+['constant']='\const{red}'
+['dashed_constant']='\const{no-such-path}'
+['variable']='$k$'
+['decorated_variable']="\$k_2'\$"
+['dashed_variable']='\id{best-score}'
+['fixed_function']='$\func{out-degree}(v)$'
+['assignment']='$x\gets y$'
+['increment']='$i\gets i+1$'
+['decrement']='$j\gets j-4$'
+['is_equal']='$x\isequal y$'
+['is_not_equal']='$x\ne y$'
+['compound_condition']='$x<y$ or ($x>y$ and not \id{found})'
+['procedure_call']='$\proc{Insertion-Sort}(A,n)$'
+['attribute']='$\attrib{T}{root}$'
+['dashed_attribute']='$\attrib{A}{heap-size}$'
+['indexed_attribute']='$\attrib{x}{\id{key}_i}$'
+['return_no_value']='\Return'
+['return_single_value']='\Return $x$'
+['return_multiple_values']='\Return $x$ and $y$'
+['exchange']='exchange $x$ with $y$'
+['swap']='swap $x$ with $y$'
+['error']="\Error \`\`overflow''"
+['print']='print $x$'
+['new_array']='let $A[0\subarr n]$ be a new array'
+['array_cell']='$A[i]$'
+['new_set']='$S\gets\emptyset$'
+['set_union']='$S\cup\{x\}$'
+['set_cardinality']='$|S|$'
+['floor_division']='$\lfloor a/b\rfloor$'
+['ceiling_division']='$\lceil a/b\rceil$'
+['minimum']='$\min\{x,y\}$'
+['maximum']='$\max\{x,y\}$'
+['if_statement']='
+\zi \If condition1
+\zi     \Then statement1
+\zi \ElseIf condition1
+\zi     \Then statement2
+\zi \ElseNoIf statement3
+        \End'
+['for_to_loop']='
+\zi \For $i=a$ \To $b$
+\zi     \Do body
+        \End'
+['for_downto_loop']='
+\zi \For $i=b$ \Downto $a$
+\zi     \Do body
+        \End'
+['for_each_loop']='
+\zi \For each $v\in V$
+\zi     \Do body
+        \End'
+['while_loop']='
+\zi \While condition
+\zi    \Do body
+       \End'
+['repeat_loop']='
+\zi \Repeat
+\zi     body
+\zi \Until condition'
+)
+
+rm *.png
+
+for name in "${!instructions[@]}"; do
+  cat <<EOF > "$name".tex
+\documentclass[convert]{standalone}
+\makeatletter
+\def\input@path{{../}}
+\makeatother
+\usepackage{amsmath}
+\usepackage{txfonts}
+\usepackage[lite,eucal,amsbb,subscriptcorrection,zswash]{mtpro2}
+\usepackage{varwidth}
+\usepackage{clrscode4e}
+\begin{document}
+\begin{varwidth}{\linewidth}
+\vspace*{-3ex}
+\begin{innercodebox}
+${instructions[$name]}
+\end{innercodebox}
+\end{varwidth}
+\end{document}
+EOF
+  pdflatex -halt-on-error -interaction=batchmode -shell-escape "$name".tex
+  rm "$name".{tex,aux,log,pdf}
+done

util/standalone.cfg

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+\standaloneconfig{
+  multi=false,
+  crop,
+  convert={
+    convertexe=convert,
+    outext=.png,
+    command={%
+      \convertexe\space
+      -density 300 -alpha remove -alpha off
+      \infile\space
+      --out \outfile
+    }
+  }
+}