Check a BibTeX bibliography to make sure everything is properly linked (DOI, ISBN or arXiv).

Confirm-Citations.ps1

ipmo posh-tex

function ConvertFrom-BibTeX {
    param(
        [string] $Path
    )
    
    $bibDB = Invoke-Python @"
import bibtexparser
import json

with open(r"$Path") as bibtex_file:
    bib_db = bibtexparser.load(bibtex_file)
print(json.dumps(bib_db.entries))
"@ | ConvertFrom-Json;

    foreach ($bibItem in $bibDB) {
        $bibItem | Write-Output
    }
}

function Get-CitedKeys {
    param([string] $Path)
    (
        Select-String -Path $Path -Pattern "\\citation\{([\w\-\:\,]*)\}" |
        % { $_.Matches.Groups[1].Value -split "," } | Sort-Object | Get-Unique
    )
}


function Confirm-Citations {
    param([string] $AuxPath, [string] $BibPath)
    $citedKeys = Get-CitedKeys $AuxPath;
    ConvertFrom-BibTeX $BibPath | ? {($_.ID -in $citedKeys) -and -not ($_.DOI -or $_.ISBN -or ($_.link -match ".*arxiv\.org.*"))}
}