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|
# SmartNav.psm1
# Poor man's zoxide for PowerShell - frecency-based smart cd
# DB: JSON at $env:USERPROFILE\.smartnav\dirs.json
$Script:DBPath = "$($env:USERPROFILE)\.smartnav\dirs.json"
# ---------------------------------------------------------------------------
# Internal helpers
# ---------------------------------------------------------------------------
function Initialize-SmartNav {
$dir = Split-Path $Script:DBPath
if (-not (Test-Path $dir)) {
New-Item -Path $dir -ItemType Directory | Out-Null
}
if (-not (Test-Path $Script:DBPath)) {
'[]' | Set-Content $Script:DBPath -Encoding UTF8
}
}
function Read-NavDB {
Initialize-SmartNav
$raw = Get-Content $Script:DBPath -Raw -Encoding UTF8
if ([string]::IsNullOrWhiteSpace($raw)) { return @() }
try {
$parsed = $raw | ConvertFrom-Json
# ConvertFrom-Json returns a single object when the array has 1 item,
# so force it to always be an array.
return @($parsed)
}
catch {
Write-Warning "SmartNav: DB corrupt, resetting. ($($_.Exception.Message))"
'[]' | Set-Content $Script:DBPath -Encoding UTF8
return @()
}
}
function Write-NavDB {
param([object[]]$Entries)
$Entries | ConvertTo-Json -Depth 3 | Set-Content $Script:DBPath -Encoding UTF8
}
# Frecency score: combines visit count and how recent the last visit was.
# Returns a float so Sort-Object can rank properly.
function Get-Frecency {
param(
[int]$Score,
[string]$LastAccess # ISO 8601 string
)
try {
$age = (Get-Date) - [datetime]$LastAccess
$hoursSince = $age.TotalHours
}
catch {
$hoursSince = 999999
}
# Decay buckets (mirrors zoxide's rough weighting)
$weight = switch ($true) {
($hoursSince -lt 1) { 4.0 }
($hoursSince -lt 24) { 2.0 }
($hoursSince -lt 168) { 0.5 } # < 1 week
default { 0.25 }
}
return [math]::Round($Score * $weight, 4)
}
# ---------------------------------------------------------------------------
# Public functions
# ---------------------------------------------------------------------------
function Update-NavScore {
param([string]$Path)
if ([string]::IsNullOrWhiteSpace($Path)) { return }
if (-not (Test-Path $Path)) { return }
$entries = Read-NavDB
$now = (Get-Date).ToString('o')
$existing = $entries | Where-Object { $_.path -eq $Path }
if ($existing) {
$existing.score = $existing.score + 1
$existing.last_access = $now
}
else {
$entries += [PSCustomObject]@{
path = $Path
score = 1
last_access = $now
}
}
Write-NavDB -Entries $entries
}
function Get-NavMatch {
param([string]$Query)
$entries = Read-NavDB
if ($entries.Count -eq 0) { return $null }
# 1. Try regex match on path components
$escaped = [regex]::Escape($Query)
$matched = $entries | Where-Object {
try { $_.path -match $escaped }
catch { $false }
}
# 2. Fallback: plain substring (case-insensitive)
if (-not $matched) {
$matched = $entries | Where-Object {
$_.path -like "*$Query*"
}
}
if (-not $matched) { return $null }
# 3. Sort by frecency, pick best
$best = $matched |
ForEach-Object {
[PSCustomObject]@{
path = $_.path
frecency = Get-Frecency -Score $_.score -LastAccess $_.last_access
}
} |
Sort-Object -Property frecency -Descending |
Select-Object -First 1
# 4. Validate the path still exists on disk
if ($best -and (Test-Path $best.path)) {
return $best.path
}
# 5. Path is stale - remove it and return null
$cleaned = $entries | Where-Object { $_.path -ne $best.path }
Write-NavDB -Entries @($cleaned)
return $null
}
# ---------------------------------------------------------------------------
# cd override
# ---------------------------------------------------------------------------
function cd {
param(
[Parameter(Position = 0)]
[string]$Path
)
# No args: go home
if (-not $Path) {
Push-Location $env:USERPROFILE
Update-NavScore $PWD.Path
return
}
# "-": go back
if ($Path -eq '-') {
Pop-Location
Update-NavScore $PWD.Path
return
}
# "~": explicit home
if ($Path -eq '~') {
Push-Location $env:USERPROFILE
Update-NavScore $PWD.Path
return
}
# Actual path: navigate directly
if (Test-Path $Path) {
Push-Location $Path
Update-NavScore $PWD.Path
return
}
# Fuzzy match: search history
$match = Get-NavMatch $Path
if ($match) {
Write-Host " -> $match" -ForegroundColor DarkGray
Push-Location $match
Update-NavScore $PWD.Path
}
else {
Write-Host "No matches for '$Path'" -ForegroundColor Red
}
}
# ---------------------------------------------------------------------------
# Bonus: list top visited dirs (like zoxide query -l)
# ---------------------------------------------------------------------------
function Get-NavHistory {
param(
[int]$Top = 20,
[string]$Filter = ''
)
$entries = Read-NavDB
if ($entries.Count -eq 0) {
Write-Host "No history yet." -ForegroundColor DarkGray
return
}
$results = $entries |
ForEach-Object {
[PSCustomObject]@{
frecency = Get-Frecency -Score $_.score -LastAccess $_.last_access
score = $_.score
path = $_.path
}
} |
Where-Object { $_.path -like "*$Filter*" } |
Sort-Object -Property frecency -Descending |
Select-Object -First $Top
$results | Format-Table -AutoSize
}
# ---------------------------------------------------------------------------
# Exports
# ---------------------------------------------------------------------------
Export-ModuleMember -Function cd, Get-NavHistory, Update-NavScore, Get-NavMatch
|
