Roman numbers

roman_to_hindi/roman.sh

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+#!/bin/bash
+# vim: foldmethod=marker
+
+function romanToArabic {
+    local input=$1
+    local result=0
+    local prevChar=""
+    local currChar=""
+    local currValue=0
+    local prevValue=0
+
+    for ((i=0; i<${#input}; i++)); do
+        currChar="${input:i:1}"
+
+        case $currChar in
+            "I") currValue=1 ;;
+            "V") currValue=5 ;;
+            "X") currValue=10 ;;
+            "L") currValue=50 ;;
+            "C") currValue=100 ;;
+            "D") currValue=500 ;;
+            "M") currValue=1000 ;;
+            *) continue ;;
+        esac
+		# Comment{{{
+		# For numbers such as IV
+		# The loop first executes the else block
+		# since there is no prevValue yet.
+		# so 1 is added to the result variable 
+		# but in the case of IV and such the second iteration 
+		# executes the if block, and so we have to substract 2 
+		# from the result variable. 1 for the incorrect addition 
+		# and 1 for the current number.
+		# }}}
+        if ((prevValue < currValue)); then
+            result=$((result + currValue - 2 * prevValue))
+        else
+            result=$((result + currValue))
+        fi
+
+        prevChar="$currChar"
+        prevValue="$currValue"
+    done
+
+    echo "$result"
+}
+
+if [[ -z "$1" ]]; then
+    echo "Usage: $0 <inputFile_or_romanNumerals>"
+    exit 1
+fi
+
+if [[ -f "$1" ]]; then
+    inputFile="$1"
+
+    while IFS= read -r line; do
+        eval "line=$(echo "$line" | sed -E 's/([IVXLCDM]+)/$(romanToArabic "\1")/g')"
+        echo "$line"
+    done < "$inputFile" > "$inputFile.tmp"
+
+    mv "$inputFile.tmp" "$inputFile"
+
+    echo "Roman numerals converted in $inputFile"
+else
+    romanNumerals="$1"
+    arabicNumber=$(romanToArabic "$romanNumerals")
+    echo "Roman numerals '$romanNumerals' converted to: $arabicNumber"
+fi

roman_to_hindi/test.md

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+I
+II
+III
+IV
+V
+VI
+VII
+VIII
+IX
+X