Pattern replacer

horta-replacer.ps1

<#
.DESCRIPTION
    This script is for replacing something by pattern in all text files 
    in specific directory and its subdirectories recursively.

.PARAMETER word 
    Pattern what we want to replace.

.PARAMETER replace
    Replacement.

.PARAMETER place
    Directory where lies files and subdirectories.

.EXAMPLE
    .\replace.ps1 -place D:\awesome_stories -word "#define true 1" -replace "#define true 0"

.NOTES
    Author: Alex Newlifer - alex.newlifer@gmail.com
#>
param(
    [string]$place   = $PSScriptRoot,
    [string]$word    = "",
    [string]$replace = ""
)

$regexPattern = $word
if($caseSensitive -eq $false) { $regexPattern = "(?i)$regexPattern" }
$regex = New-Object System.Text.RegularExpressions.Regex $regexPattern

# Function for highlighting pattern in the line.
function Write-HostAndHighlightPattern([string]$inputText)
{
    $index = 0
    while($index -lt $inputText.Length)
    {
        $match = $regex.Match($inputText, $index)
        if($match.Success -and $match.Length -gt 0)
        {
            Write-Host $inputText.SubString($index, $match.Index - $index) -nonewline
            Write-Host $match.Value.ToString() -ForegroundColor Red -nonewline
            $index = $match.Index + $match.Length
        }
        else
        {
            Write-Host $inputText.SubString($index) -nonewline
            $index = $inputText.Length
        }
    }
}

$time1 = Get-Date -format HH:mm:ss

$list = Get-ChildItem $place -recurse -Exclude "*.dll", "*.exe", "*.lib", "*.obj", "*.manifest", "*.log", "*.tlog", "*.sdf" | %{Write-Host Examining file: $_.fullname; $_} | ? { $_.psiscontainer -eq $false } | ? { gc $_.pspath | select-string -pattern $word } | % { $_.FullName } 

$time2 = Get-Date -format HH:mm:ss

Write-Host "Count of matched files: " $list.Length

$TimeDiff = New-TimeSpan $Time1 $Time2

if ($TimeDiff.Seconds -lt 0) {
    $Hrs = ($TimeDiff.Hours) + 23
    $Mins = ($TimeDiff.Minutes) + 59
    $Secs = ($TimeDiff.Seconds) + 59 }
else {
    $Hrs = $TimeDiff.Hours
    $Mins = $TimeDiff.Minutes
    $Secs = $TimeDiff.Seconds }
$Difference = '{0:00}:{1:00}:{2:00}' -f $Hrs,$Mins,$Secs
$Difference

foreach( $file in $list )
{
    $text = get-content $file
    $line = $text | select-string -pattern $word -simplematch

    Write-Host "Do you really want to replace here? (Y/N)"
    Write-HostAndHighlightPattern $line
    $yes  = Read-Host "`n"
    

    
    switch( $yes ) {
        "Y" {
            $newText = $text -replace $word, $replace
            $newText > $file
        }
        "N" {
            continue
        }
        default {
            Write-Host "Unknown command " $yes
        }
    }
}

Write-Host "Work is done!"