/
index.ts
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/
index.ts
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#!/usr/bin/env node
const csvgenerate: any = require('csv-write-stream');
const cmdusage:any = require('command-line-usage');
import * as commandLineArgs from 'command-line-args';
import * as fs from 'fs';
import * as sqlite3 from "sqlite3";
import * as async from "async";
import * as path from "path";
import * as csvparser from "csv-parse";
import * as iconvlite from "iconv-lite";
const db = new sqlite3.Database(':memory:');
const optionsDefinitions:commandLineArgs.OptionDefinition[]= [
{name:'verbose',alias:'v',type:Boolean,description:"Verbose Logging"},
{name:'csv',alias:'c',type:String,multiple:true,description:"CSV files to load"},
{name:'queries',alias:'q',type:String,multiple:true,description:"Queries to run on the data"},
{name:'outfiles',alias:'o',type:String,multiple:true,description:"Paths were the data should be written to. One per query"},
{name:'csvdelimiter',alias:'d',defaultValue:";",type:String,description:"Delimiter of the csv files"},
{name:'outputdelimiter',alias:'D',defaultValue:';',type:String,description:"Delimiter of the output csv files"},
{name:'outputnewline',alias:'N',defaultValue:'\r\n',type:String,description:"Newline of the output csv files"},
{name:'noheader',alias:'H',defaultValue:false,type:Boolean,description:"Omit writing the header to the csv files"},
{name:'csvencoding',alias:'e',defaultValue:"utf-8",type:String,description:"Encoding of the loaded csv files"},
{name:'outputencoding',alias:'E',defaultValue:"utf-8",type:String,description:"Encoding of the output csv files"},
{name:'queryencoding',defaultValue:"utf-8",type:String,description:"Encoding of the queries"},
{name:'help',alias:'h',defaultValue:false,type:Boolean,description:"Show this help text"}
];
const options = commandLineArgs.default(optionsDefinitions);
if(options.help){
const sections = [
{
header:"queryoncsv",
content: "A small command line utility to query csv files using sqlite3"
},{
header:"Options",
optionList:optionsDefinitions
}
];
console.log(cmdusage(sections));
process.exit(0);
}
if(!options.csv || options.csv.length == 0){
console.error("No csv files supplied, exiting");
process.exit(1);
}
if(!options.queries || options.queries.length == 0){
console.error("No queries supplied, exiting");
process.exit(1);
}
if(!options.outfiles || options.outfiles.length != options.queries.length){
console.error("Number of outfiles need to match number of queries");
process.exit(1);
}
if(!iconvlite.encodingExists(options.csvencoding)){
console.error("CSV Encoding " + options.csvencoding + " does not exist");
process.exit(1);
}
if(!iconvlite.encodingExists(options.queryencoding)){
console.error("Query Encoding " + options.queryencoding + " does not exist");
process.exit(1);
}
if(!iconvlite.encodingExists(options.outputencoding)){
console.error("Output Encoding " + options.outputencoding + " does not exist");
process.exit(1);
}
loadCSVFiles(options.csv,function(err){
if(err){
console.error(err);
process.exit(1);
}
log("Succesfully loaded all csv files");
executeQueries(options.queries,function(err){
if(err){
console.error(err);
}
});
});
function log(p:string|any){
if(options.verbose){
console.log(p);
}
}
function loadCSVFiles(paths:string[],callback:async.ErrorCallback<Error>){
async.each(paths,function(csvpath:string,callback:async.ErrorCallback<Error>){
log("Checking if file exists:" +csvpath);
if(!fs.existsSync(csvpath) ||fs.lstatSync(csvpath).isDirectory()){
console.error("Could not find " + csvpath +" , exiting");
process.exit(1);
}
const tablename = path.basename(csvpath,".csv");
log("Success checking " + tablename +"!");
const abspath = path.resolve(csvpath);
const csvContentBuffer:Buffer = fs.readFileSync(abspath);
const csvContent:string = iconvlite.decode(csvContentBuffer, options.csvencoding);
csvparser.default(csvContent,{delimiter:options.csvdelimiter},function(err,parsedCSV:string[][]){
if(err){
return callback(err);
}
log(parsedCSV[0]);
const columnNames = parsedCSV[0];
const columnUsages :{[key:string]:number} ={};
const columnDefinitions =columnNames.map(function(column){
let lastUsage:number = 0;
let columnStr:String = column;
if(column in columnUsages){
lastUsage = columnUsages[column]
columnStr = column + "-duplicate-" + lastUsage;
}
columnUsages[column] = lastUsage + 1;
return "[" + columnStr + "]" + " TEXT";
}).reduce((a,b)=>{return a+ ", " +b;});
const tableDefinition = "CREATE TABLE " + tablename + " (" + columnDefinitions + ")";
log(tableDefinition);
db.run(tableDefinition,(err)=>{
if(err){
console.error(err);
return callback(err);
}
async.eachOf(parsedCSV,(row:string[],index,callback:async.ErrorCallback<Error>)=>{
//do not enter first row as data row, as this is the header
if(index == 0)
return callback();
const queryString = "INSERT INTO " + tablename + " VALUES (" + row.map(_=>{return "?"}).reduce((a,b)=>{return a+ ", " +b;}) + ")";
log(queryString);
log(row);
db.run(queryString,row,(err:Error|undefined)=>{
callback(err);
})
},err=>{
return callback(err);
});
});
});
},(err)=>{
callback(err);
});
}
function executeQueries(paths:string[],callback:async.ErrorCallback<Error>){
async.eachOf(paths,(querypath:string,queryindex,callback:async.ErrorCallback<Error>)=>{
if(!fs.lstatSync(querypath).isFile()){
console.error("Could not find " + querypath+ " ,exiting");
process.exit(1);
}
log("Found " + querypath);
const queryBuffer:Buffer = fs.readFileSync(querypath,{encoding:null,"flag":"r"});
const query:string = iconvlite.decode(queryBuffer,options.queryencoding);
log(query);
db.all(query,(err,rows)=>{
if(err){
console.error(err);
return;
}
log(rows);
if(rows.length == 0){
log("Empty query result");
}else{
const outpath = options.outfiles[queryindex];
const header = Object.keys(rows[0]);
log(header);
const writer = csvgenerate({
separator:options.outputdelimiter,
newline:options.outputnewline,
header:header,
sendHeaders:!options.noheader
});
writer
.pipe(iconvlite.encodeStream(options.outputencoding))
.pipe(fs.createWriteStream(outpath));
rows.forEach((row)=>{writer.write(row)});
writer.end();
}
})
});
}