Commit for initial Github release

.gitignore

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+.vscode

CreateNotification.ps1

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+. $PSScriptRoot/DllLoad.ps1
+. $PSScriptRoot/Logging.ps1
+. $PSScriptRoot/NotificationXmlBuilder.ps1
+
+
+function ShowNotification ([Windows.Data.Xml.Dom.XmlDocument]$xml, [string]$source_app_id) {
+    $toast = [Windows.UI.Notifications.ToastNotification]::new($xml)
+    [Windows.UI.Notifications.ToastNotificationManager]::CreateToastNotifier($source_app_id).Show($toast)
+}
+
+
+function GetMessageParts ([string[]]$file_content) {
+    $directives = @{}
+    $content = @()
+    foreach ($line in $file_content) {
+        if ($line.StartsWith("#")) {
+            # comment
+        } elseif ($line.StartsWith("||") -or $line.StartsWith("|#") ) {
+            # escape sequence, remove the initial | and interpret the rest as text
+            $content += $line.Substring(1, $line.Length - 1)
+        } elseif ($line.StartsWith("|")) {
+            # directive
+            $parts = $line.Substring(1, $line.Length - 1) -Split ":", 2
+            $k = $parts[0].Trim()
+            if ($k.StartsWith("!")) {
+                # negative boolean directive
+                $k = $k.Substring(1, $k.Length - 1)
+                $directives[$k] = $false
+            } else {
+                $v = if ($parts.Count -gt 1) {$parts[1].Trim()} else {$true}
+                $directives[$k] = $v 
+            }
+        } else {
+            # message text
+            $content += $line
+        }
+    }
+    return (@{Directives=$directives; Content=$content})
+}
+
+
+function BuildToastDataFromContent ([string[]] $file_content, [string]$log_file_path = $null,
+                                    [Nullable[datetime]]$timestamp = $null,
+                                    [bool]$enable_web_images = $false, [int]$max_web_image_size_bytes = 0,
+                                    [hashtable]$default_directives = @{}) {
+    $message = GetMessageParts($file_content)
+    $text_content = $message.Content
+    $directives = $default_directives.Clone()
+    foreach ($k in $message.Directives.Keys) {
+        $directives[$k] = $message.Directives.$k
+    }
+    $builder = [NotificationXmlBuilder]::new($text_content, $directives, $timestamp, $log_file_path, $enable_web_images, $max_web_image_size_bytes)
+    return $builder.GetNotificationData()
+}
+
+
+function NotifyFromFile ([string]$file_path, [string]$app_id, [string]$log_file_path,
+                                    [switch]$timestamp_from_file = $false,
+                                    [switch]$enable_web_images = $false, [int]$max_web_image_size_bytes = 0,
+                                    [hashtable]$default_directives = @{}) {
+    try {
+        WriteLogMessage "Attempting to process $file_path" $log_file_path
+        if ($timestamp_from_file) {
+            $private:file_time = (Get-Item -Path $file_path).LastWriteTime
+        } else {
+            $private:file_time = $null
+        }
+
+        $private:file_content = Get-Content -Path $file_path
+        if ($null -eq $file_content) {
+            WriteLogMessage "Got no content for $file_path" $log_file_path
+            return
+        }
+        if ($file_content.GetType().Name -eq "String") {
+            $file_content = @($file_content)
+        }
+
+        $toast_data = BuildToastDataFromContent $file_content -log_file_path:$log_file_path -timestamp:$file_time `
+                                                -default_directives:$default_directives `
+                                                -enable_web_images:$enable_web_images -max_web_image_size_bytes:$max_web_image_size_bytes
+        if (!$toast_data.Source_App_Id) {
+            $toast_data['Source_App_Id'] = $app_id
+        }
+        WriteLogMessage "Firing toast with XML:" $log_file_path
+        WriteLogMessage $toast_data.Xml.GetXml() $log_file_path
+        ShowNotification @toast_data
+
+        Remove-Item -Path $file_path
+        WriteLogMessage "Processed and deleted $file_path" $log_file_path
+    } catch {
+        WriteLogMessage "Error raising toast for $file_path" $log_file_path
+        WriteLogMessage $_ $log_file_path
+    }
+}
+
+
+function NotifyFromDir ([string]$directory, [string]$app_id, [string]$log_file_path,
+                                    [double]$min_age_sec = 5, [string]$file_pattern = "*.*",
+                                    [hashtable]$default_directives = @{}, [switch]$timestamp_from_file = $false,
+                                    [switch]$enable_web_images = $false, [int]$max_web_image_size_bytes = 0,
+                                    [switch]$recurse = $false) {
+    if (!($directory)) {
+        WriteLogMessage "NotifyFromDir called with empty directory: pass '.' if you really want to use the working dir" $log_file_path
+        return
+    }
+    $ts = Get-Date
+    WriteLogMessage "Sweeping $directory" $log_file_path
+    if ($recurse) {
+        $files = Get-ChildItem -Path $directory -Filter $file_pattern -File -Recurse
+    } else {
+        $files = Get-ChildItem -Path $directory -Filter $file_pattern -File
+    }
+
+    $files | ForEach-Object {
+        $age = (New-TimeSpan -Start $_.LastWriteTime -End $ts).TotalSeconds
+        if ($age -ge $min_age_sec) {
+            NotifyFromFile $_.FullName $app_id $log_file_path -default_directives:$default_directives -timestamp_from_file:$timestamp_from_file `
+                            -enable_web_images:$enable_web_images -max_web_image_size_bytes:$max_web_image_size_bytes
+        } else {
+            WriteLogMessage "Ignoring too recent file: $($_.FullPath)" $log_file_path
+        }
+    }
+    WriteLogMessage "Sweep complete for $directory" $log_file_path
+}

DllLoad.ps1

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+$legacy = $PSVersionTable.PSVersion.Major -eq 5
+
+[System.Reflection.Assembly]::LoadFrom("$PSScriptRoot\dll\CommunityToolkit.WinUI.Notifications.dll")
+[System.Reflection.Assembly]::LoadFrom("$PSScriptRoot\dll\Microsoft.Windows.SDK.NET.dll")
+[System.Reflection.Assembly]::LoadFrom("$PSScriptRoot\dll\WinRT.Runtime.dll")
+
+if ($legacy) {
+    [Windows.UI.Notifications.ToastNotificationManager, Windows.UI.Notifications, ContentType = WindowsRuntime] | Out-Null
+    [Windows.Data.Xml.Dom.XmlDocument, Windows.Data.Xml.Dom, ContentType = WindowsRuntime] | Out-Null
+}

ImageCache.ps1

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+class ImageCache {
+    static [hashtable]$PathMap = @{}
+    static [hashtable]$BadUris = @{}
+    static [int]$DefaultMaxSizeInBytes = 256000
+    static [int]$MaximumAttempts = 3
+
+
+    static [void]Reset () {
+        [ImageCache]::PathMap = @{}
+        [ImageCache]::BadUris = @{}
+    }
+
+    static [string]StoreResponseData ([object]$response) {
+        $file_stream = $null
+        try {
+            $local_file = New-TemporaryFile
+            $local_file_path = $local_file.FullName
+            $file_stream = New-Object IO.FileStream($local_file, "Append", "Write", "Read")
+            $response.RawContentStream.CopyTo($file_stream)
+            WriteLogMessage "Saved to $local_file_path"
+            return $local_file_path
+        } finally {
+            if ($file_stream) {
+                $file_stream.Close()
+            }
+        }
+    }
+
+    static [string]FetchImage ([string]$uri, [string]$log_file_path, [nullable[int]]$max_size_bytes) {
+        if ([ImageCache]::PathMap.ContainsKey($uri)) {
+            $local_path = [ImageCache]::PathMap[$uri]
+            if (Test-Path $local_path) {
+                WriteLogMessage "Using already downloaded image from $uri" $log_file_path
+                return $local_path
+            }
+        }
+        if ([ImageCache]::BadUris.ContainsKey($uri)) {
+            $failures = [ImageCache]::BadUris[$uri]
+            if (([ImageCache]::MaximumAttempts -gt 0) -and $failures -ge [ImageCache]::MaximumAttempts) {
+                WriteLogMessage "Not retrying ($failures previous failures): $uri" $log_file_path
+                return ""
+            } elseif ($failures -eq -1) {
+                WriteLogMessage "Not retrying (too large): $uri" $log_file_path
+                return ""
+            }
+        }
+
+        if ($null -eq $max_size_bytes) {
+            $max_size_bytes = [ImageCache]::DefaultMaxSizeInBytes
+        }
+        $ret = ""
+        try {
+            $response = Invoke-WebRequest -Uri $uri
+            $response_size = $response.RawContentLength
+            WriteLogMessage "Downloaded image ($response_size bytes) from $uri" $log_file_path
+            if ($response_size -gt $max_size_bytes) {
+                [ImageCache]::BadUris[$uri] = -1
+                WriteLogMessage "Image too large: not saving"
+            } else {
+                $local_file_path = [ImageCache]::StoreResponseData($response)
+                [ImageCache]::PathMap[$uri] = $local_file_path
+                $ret = $local_file_path
+            }
+        } catch {
+            WriteLogMessage "Exception fetching image from $uri" $log_file_path
+            WriteLogMessage $_ $log_file_path
+            [ImageCache]::BadUris[$uri] = if ([ImageCache]::BadUris.ContainsKey($uri)) {[ImageCache]::BadUris[$uri] + 1} else {1}
+        }
+        return $ret
+    }
+}

Init.ps1

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+. $PSScriptRoot/Listener.ps1
+. $PSScriptRoot/Logging.ps1
+
+
+function InitalizeLogging ([string]$LogsDir) {
+    # Minimal initialization of logging (so logs can be available before more complicated initialization steps)
+    if ($null -eq $app_context) {
+        $global:app_context = @{}
+    }
+    New-Item -Path $LogsDir -ItemType Directory -ErrorAction SilentlyContinue
+    $ts = Get-Date -UFormat '%Y%m%d_%H%M%S'
+    $app_context["log_file_path"] = Join-Path -Path $LogsDir -ChildPath "toast_$ts.log"
+}
+
+
+function Initialize ([string[]]$WatchedDirs = @(), [string]$FilePattern = "*.toa", [switch]$TimestampFromFile = $false, [double]$SweepIntervalSec = 600,
+                    [double]$SweepMinAgeSec = 5, [string]$LogsDir = "", [double]$PurgeLogsOlderThan = -1, [hashtable]$DefaultDirectives = @{},
+                    [switch]$SweepOnStartup = $false, [switch]$Recurse = $false, [switch]$EnableWebImages = $false, [double]$MaxWebImageSizeKb = 256) {
+    if (!($WatchedDirs.Count)) {
+        throw "Empty array of directories supplied"
+    }
+
+    if ($null -eq $app_context) {
+        $global:app_context = @{}
+    }
+    $app_context["timestamp_from_file"] = $TimestampFromFile
+    $app_context["default_directives"] = $DefaultDirectives
+    $app_context["enable_web_images"] = $EnableWebImages
+    $app_context["max_web_image_size_bytes"] = [int]($MaxWebImageSizeKb * 1000)
+
+    $apps = Get-StartApps | Where-Object { $_.Name.ToLower() -match ("^(windows )?powershell") }
+    $app_context["app_id"] = $apps[0].AppID
+
+    if ($LogsDir) {
+        if (!($app_context.log_file_path)) {
+            InitalizeLogging $LogsDir
+        }
+
+        if ($PurgeLogsOlderThan -ge 0) {
+            $keep_after = (Get-Date).AddDays(-$PurgeLogsOlderThan)
+            Get-ChildItem -Path $LogsDir -File | Where-Object { $_.CreationTime -lt $keep_after } | Remove-Item -Force
+        }
+    } else {
+        $app_context["log_file_path"] = $null
+    }
+
+    WriteLogMessage "Setting up listeners for $( $WatchedDirs.Length ) directories" $log_file_path
+
+     # Resolve items like ~ in the path: the FileSystemWatcher needs the resolved path
+    $dir_full_paths = $WatchedDirs | % { $ExecutionContext.SessionState.Path.GetUnresolvedProviderPathFromPSPath($_) }
+    foreach($dir in $dir_full_paths) {
+        New-Item -Path $dir -ItemType Directory -ErrorAction SilentlyContinue
+    }
+    CreateToastListeners $dir_full_paths -file_pattern:$FilePattern -recurse:$Recurse
+    CreateToastDirectorySweeper $dir_full_paths -interval_sec:$SweepIntervalSec -file_pattern:$FilePattern -min_age_sec:$SweepMinAgeSec -recurse:$Recurse
+    WriteLogMessage "Listener setup complete" $log_file_path
+
+    if ($SweepOnStartup) {
+        WriteLogMessage "Sweeping for files present on startup" $log_file_path
+        New-Event -SourceIdentifier "LightlyToastedSweepForce" -MessageData @{Directories = $dir_full_paths; Pattern = $FilePattern; Recurse = $Recurse}
+    }
+}

LICENSE.md

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+Copyright (c) 2022 Philip Grant.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

Listener.ps1

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+. $PSScriptRoot/CreateNotification.ps1
+. $PSScriptRoot/Logging.ps1
+
+
+function global:HandleFileEvent ([System.Management.Automation.PSEventArgs]$ev) {
+    NotifyFromFile $ev.SourceArgs.FullPath $app_context.app_id $app_context.log_file_path `
+                            -default_directives:$app_context.default_directives -timestamp_from_file:$app_context.timestamp_from_file `
+                            -enable_web_images:$app_context.enable_web_images -max_web_image_size_bytes:$app_context.max_web_image_size_bytes
+}
+
+
+function global:HandleDirectoriesEvent ([System.Management.Automation.PSEventArgs]$ev) {
+    foreach($dir in $ev.MessageData.Directories) {
+        NotifyFromDir $dir $app_context.app_id $app_context.log_file_path `
+            -file_pattern:$ev.MessageData.Pattern -default_directives:$app_context.default_directives `
+            -timestamp_from_file:$app_context.timestamp_from_file `
+            -enable_web_images:$app_context.enable_web_images -max_web_image_size_bytes:$app_context.max_web_image_size_bytes `
+            -min_age_sec:$ev.MessageData.MinAgeSec -recurse:$ev.MessageData.Recurse
+    }
+}
+
+
+function CreateToastListeners ([string[]]$directories, [string]$file_pattern = "*.*", [switch]$recurse = $false) {
+    $i = 0
+    foreach($directory in $directories) {
+        WriteLogMessage "Creating listener for: $directory" $app_context.log_file_path
+        $watcher = New-Object System.IO.FileSystemWatcher
+        $watcher.Path = $directory
+        $watcher.Filter = $file_pattern
+        $watcher.EnableRaisingEvents = $true
+        $watcher.IncludeSubdirectories = $recurse
+
+        foreach ($ev_name in @("Created", "Renamed")) {
+            Register-ObjectEvent -SourceIdentifier "LightlyToasted$i" `
+                                    -InputObject $watcher `
+                                    -EventName $ev_name `
+                                    -Action { try { HandleFileEvent $event } catch { WriteLogMessage $_.Exception.Message $app_context.log_file_path } }
+            $i++
+        }
+    }
+}
+
+
+function CreateToastDirectorySweeper([string[]]$directories, [double]$interval_sec = 300, [string]$file_pattern = "*.*",
+                                    [double]$min_age_sec = 5, [switch]$recurse = $false) {
+    WriteLogMessage "Creating directory sweeper for $( $directories.Length ) directories:" $app_context.log_file_path
+    $directories | % { WriteLogMessage "    $_" $app_context.log_file_path }
+    $timer = New-Object System.Timers.Timer
+    $timer.Interval = $interval_sec * 1000
+    $timer.AutoReset = $true
+    $timer.Enabled = $true
+
+    Register-ObjectEvent -SourceIdentifier "LightlyToastedSweep" `
+                            -InputObject $timer `
+                            -EventName "Elapsed" `
+                            -MessageData @{Directories = $directories; Pattern = $file_pattern; MinAgeSec = $min_age_sec; Recurse = $recurse} `
+                            -Action { try { HandleDirectoriesEvent $event } catch { WriteLogMessage $_.Exception.Message $app_context.log_file_path } }
+
+    Register-EngineEvent -SourceIdentifier "LightlyToastedSweepForce" `
+                            -Action {try { HandleDirectoriesEvent $event } catch { WriteLogMessage $_.Exception.Message $app_context.log_file_path } }
+}

Logging.ps1

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+function global:WriteLogMessage ([string] $msg, [string]$log_file_path, [bool]$ToConsole = $true) {
+    $ts = Get-Date -UFormat '%Y-%m-%d %H:%M:%S'
+    if ($log_file_path) {
+        if ($ToConsole) {
+            "[$ts] $msg" | Tee-Object -FilePath $log_file_path -Append | Write-Host
+        } else {
+            "[$ts] $msg" | Out-File -FilePath $log_file_path -Append
+        }
+    } elseif ($ToConsole) {
+        "[$ts] $msg" | Write-Host
+    }
+}