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| -rwxr-xr-x | pwsh-diff | 342 |
1 files changed, 342 insertions, 0 deletions
diff --git a/pwsh-diff b/pwsh-diff new file mode 100755 index 0000000..bf10324 --- /dev/null +++ b/pwsh-diff @@ -0,0 +1,342 @@ +#!/usr/bin/env pwsh + +param ( + [Parameter(Mandatory=$true, ValueFromPipeline=$true)][string[]]$input +) + +$VERSION = "0.1.0" +$COLOR_REGEX = "\x1b\[[0-9;]*m" + +class HighlightTheme { + [string]$NormalColor + [string]$HighlightColor +} + +class LinePair { + [string]$RemovedLine + [string]$AddedLine +} + +class Hunk { + [string[]]$RemovedLines + [string[]]$AddedLines +} + +function New-Hunk { + return [Hunk]@{ + RemovedLines = @() + AddedLines = @() + } +} + +function Get-Color { + param ( + [string]$str + ) + + if (!$str -or $str -eq "reset") { + return "`e[0m"; + } + + # Replace named colors with numeric colors + $color_hash = @{ + "red" = "160"; + "blue" = "21"; + "green" = "34"; + "yellow" = "226"; + "orange" = "214"; + "purple" = "98"; + "white" = "15"; + "black" = "0"; + } + + foreach ($color in $color_hash.GetEnumerator()) { + $str = $str -Replace $color.Name, $color.Value + } + + # Extract foreground, background, and command + $match = Select-String -InputObject $str -Pattern "(\d+)?_?(\w+)?" ` + | Select-Object -ExpandProperty Matches ` + | Select-Object -First 1 + if ($match.Groups) { + $fg = $match.Groups[1].Value + $cmd = $match.Groups[2].Value + } + + $match = Select-String -InputObject $str -Pattern "on_?(\d+)" ` + | Select-Object -ExpandProperty Matches ` + | Select-Object -First 1 + + if ($match.Groups) { + $bg = $match.Groups[1].Value + } + + if ($cmd) { + # Convert named commands to numeric commands + $cmd_hash = @{ + "bold" = "1"; + "italic" = "3"; + "underline" = "4"; + "blink" = "5"; + "inverse" = "7"; + } + + foreach ($command in $cmd_hash.GetEnumerator()) { + $cmd = $cmd -Replace $command.Name, $command.Value + } + } + + # Build ANSI sequence + $seq = ""; + + if ($cmd) { + $seq += "`e[$cmd`m" + } + + if ($fg) { + $seq += "`e[38;5;$fg`m" + } + + if ($bg) { + $seq += "`e[48;5;$bg`m" + } + + return $seq +} + +# Fetch a text item from the git config +function Get-GitConfigItem { + param ( + [string]$key + ) + + return $(git config --get "$key") +} + +# Fetch a boolean item from the git config +function Get-GitConfigBoolean { + param ( + [string]$key + ) + + $text = Get-GitConfigItem $key + + if ($text -and $text -eq "true") { + return $true + } else { + return $false + } +} + +function Get-VisibleString { + param ( + [string]$str + ) + + return $str -Replace $COLOR_REGEX, "" +} + +# Count the visible width of a string, excluding any terminal color sequences. +function Measure-VisibleWidth { + param ( + [string]$str + ) + + $str = Get-VisibleString $str + return $str.Length +} + +# Return a substring of $str, omitting $len visible characters from the +# beginning, where terminal color sequences do not count as visible. +function Get-VisibleSubString { + param ( + [string]$str, + [int]$len + ) + + $str = Get-VisibleString $str + return $str.Substring(0, $len) +} + +function Split-Line { + param ( + [string]$line + ) + + return $line.ToCharArray() + # return Select-String -InputObject $line -Pattern "($COLOR_REGEX|.)" -AllMatches ` + # | ForEach-Object { $_.Matches.Value } +} + +function Set-LineHighlight { + param ( + [string]$line, + [int]$prefixEnd, + [int]$suffixStart, + [HighlightTheme]$theme + ) + + $reset = Get-Color "reset" + + # if ($prefixEnd -gt $suffixStart) { + # return -join ("$($theme.NormalColor)", $line, "$reset") + # } + + $prefix = $line.Substring(0, $prefixEnd) + $mid = $line.Substring($prefixEnd, $suffixStart - $prefixEnd + 1) + $suffix = $line.Substring($suffixStart + 1) + + return -join ( ` + "$($theme.NormalColor)", "$prefix", "$reset", ` + "$($theme.HighlightColor)", "$mid", "$reset", ` + "$($theme.NormalColor)", "$suffix", "$reset") +} + +function Set-LinePairHighlight { + param ( + [LinePair]$lines, + [HighlightTheme]$removedTheme, + [HighlightTheme]$addedTheme + ) + + $removedLineVis = Get-VisibleString $lines.RemovedLine + $removedLineSplit = Split-Line $(Get-VisibleString $lines.RemovedLine) + + $addedLineVis = Get-VisibleString $lines.AddedLine + $addedLineSplit = Split-Line $(Get-VisibleString $lines.AddedLine) + + # Find common prefix + $r_prefix = 0 + $a_prefix = 0 + $plusMinusFound = $false + + while ($r_prefix -lt $removedLineSplit.Length -and $a_prefix -lt $addedLineSplit.Length) { + $r = $removedLineSplit[$r_prefix] + $a = $addedLineSplit[$a_prefix] + + if ($r -ceq $a) { + $r_prefix++ + $a_prefix++ + } elseif (!$plusMinusFound -and $r -eq "-" -and $a -eq "+") { + $r_prefix++ + $a_prefix++ + $plusMinusFound = $true + } else { + break + } + } + + # Find common suffix + $r_suffix = $removedLineSplit.Length - 1 + $a_suffix = $addedLineSplit.Length - 1 + + while ($r_suffix -ge $r_prefix -and $a_suffix -ge $a_prefix) { + $r = $removedLineSplit[$r_suffix] + $a = $addedLineSplit[$a_suffix] + + if ($r -ceq $a) { + $r_suffix-- + $a_suffix-- + } else { + break + } + } + + $removedLineHighlight = Set-LineHighlight $removedLineVis $r_prefix $r_suffix $removedTheme + $addedLineHighlight = Set-LineHighlight $addedLineVis $a_prefix $a_suffix $addedTheme + + return [LinePair]@{ + RemovedLine = $removedLineHighlight + AddedLine = $addedLineHighlight + } +} + +function Set-HunkHighlight { + param ( + [Hunk]$hunk, + [HighlightTheme]$removedTheme, + [HighlightTheme]$addedTheme + ) + + if (!$hunk.RemovedLines -or !$hunk.AddedLines) { + return $hunk + } + + if ($hunk.RemovedLines.Count -ne $hunk.AddedLines.Count) { + return $hunk + } + + $retHunk = New-Hunk + + $i = 0 + while ($i -lt $hunk.RemovedLines.Count) { + $pair = [LinePair]@{ + RemovedLine = $hunk.RemovedLines[$i] + AddedLine = $hunk.AddedLines[$i] + } + + $pair = Set-LinePairHighlight $pair $removedTheme $addedTheme + + $retHunk.RemovedLines += $pair.RemovedLine + $retHunk.AddedLines += $pair.AddedLine + + $i++ + } + + return $retHunk +} + +function Write-Hunk { + param ( + [Hunk]$hunk + ) + + foreach ($line in $hunk.RemovedLines) { + Write-Output $line + } + + foreach ($line in $hunk.AddedLines) { + Write-Output $line + } +} + + + +$addedTheme = [HighlightTheme]@{ + NormalColor = Get-Color "39" + HighlightColor = Get-Color "39 on_4" +} + +$removedTheme = [HighlightTheme]@{ + NormalColor = Get-Color "13" + HighlightColor = Get-Color "13 on_5" +} + +$inHunk = $false +$hunk = New-Hunk + +foreach ($line in $input) { + if (!$inHunk) { + Write-Output $line + $inHunk = $line -match "^($COLOR_REGEX)*@@" + } elseif ($line -match "^($COLOR_REGEX)*-") { + $hunk.RemovedLines += $line + } elseif ($line -match "^($COLOR_REGEX)*\+") { + $hunk.AddedLines += $line + } else { + # This is the flush + $hunk = Set-HunkHighlight $hunk $removedTheme $addedTheme + foreach ($r_line in $hunk.RemovedLines) { + Write-Output $r_line + } + + foreach ($a_line in $hunk.AddedLines) { + Write-Output $a_line + } + $hunk = New-Hunk + # End of flush + + Write-Output $line + $inHunk = $line -match "^($COLOR_REGEX)*[\@ ]" + } +} |