feat(core): scoring data customizable added with config file and CLI parameter

            scoring threshold not reached returns exit code 1, other returns 0
            scoring data tests and readme documentation added

Author: PagoNxt-Trade

docs/guides/2-cli.md

@@ -39,6 +39,7 @@ Other options include:
       --stdin-filepath           path to a file to pretend that stdin comes from                                [string]
       --resolver                 path to custom json-ref-resolver instance                                      [string]
   -r, --ruleset                  path/URL to a ruleset file                                                     [string]
+  -s, --scoring-config           path/URL to a scoring config file                                       [string]
   -F, --fail-severity            results of this level or above will trigger a failure exit code
                                                   [string] [choices: "error", "warn", "info", "hint"] [default: "error"]
   -D, --display-only-failures    only output results equal to or greater than --fail-severity [boolean] [default: false]
@@ -60,6 +61,92 @@ Here you can build a [custom ruleset](../getting-started/3-rulesets.md), or exte
 - [OpenAPI ruleset](../reference/openapi-rules.md)
 - [AsyncAPI ruleset](../reference/asyncapi-rules.md)
 
+## Scoring the API
+
+Scoring an API definition is a way to understand in a high level, how compliant is the API definition with the rulesets provided. This helps teams to understand the quality of the APIs regarding the definition.
+
+The scoring is produced in two different metrics:
+
+- A number scoring. Who cames as substracting from 100% from any error or warning
+- A letter, who groups numeric scorings in letters from A (better) to any
+
+Also it introduces a quality gate, were an API scoring below the specific threshold will fail in a pipeline.
+
+Enabling scoring is done using a new parameter called --scoring-config or -s and the scoring configuration file, where you can define how an error or a warning affects to the scoring
+
+Usage:
+
+```bash
+ spectral lint ./reference/**/*.oas*.{json,yml,yaml} --ruleset mycustomruleset.js --scoring-config ./scoringFile.json
+```
+
+or
+
+```bash
+spectral lint ./reference/**/*.oas*.{json,yml,yaml} -r mycustomruleset.js -s ./scoringFile.json
+```
+
+Heres an example of this scoringFile config file:
+
+```
+    {
+      "scoringSubtract":
+        {
+          "error":
+           {
+             1:55,
+             2:65,
+             3:75,
+             6:85,
+             10:95
+           }
+          "warn":
+           {
+             1:3,
+             2:7,
+             3:10,
+             6:15,
+             10:18
+           }
+        },
+      "scoringLetter":
+        {
+          "A":75,
+          "B":65,
+          "C":55,
+          "D":45,
+          "E":0
+        },
+      "threshold":50,
+      "warningsSubtract": true,
+      "uniqueErrors": false
+    }
+```
+
+Where:
+
+- scoringSubtract : An object with a key/value pair objects for every result level we want to subtract percentage, with the percentage to subtract from number of results on every result type
+- scoringLetter : An object with key/value pairs with scoring letter and scoring percentage, that the result must be greater , for this letter
+- threshold : A number with minimum percentage value to provide valid the file we are checking
+- warningsSubtract : A boolean to setup if accumulate the result types to less the scoring percentage or stop counting on most critical result types
+- uniqueErrors : A boolean to setup a count with unique errors or with all of them
+
+Example:
+
+    With previous scoring config file, if we have:
+
+    1 error, the scoring is 45% and D
+    2 errors, the scoring is 35% and E
+    3 errors, the scoring is 25% and E
+    4 errors, the scoring is 25% and E
+    and so on
+
+Output:
+
+    Below your output log you can see the scoring, like:
+
+    ✖ SCORING: A (93%)
+
 ## Error Results
 
 Spectral has a few different error severities: `error`, `warn`, `info`, and `hint`, and they are in "order" from highest to lowest. By default, all results will be shown regardless of severity, but since v5.0, only the presence of errors will cause a failure status code of 1. Seeing results and getting a failure code for it are now two different things.

packages/cli/src/commands/__tests__/lint.test.ts

@@ -146,6 +146,22 @@ describe('lint', () => {
     );
   });
 
+  it('calls lint with document, ruleset and scoring config file', async () => {
+    const doc = './__fixtures__/empty-oas2-document.json';
+    const ruleset = 'custom-ruleset.json';
+    const configFile = 'scoring-config.json';
+    await run(`lint -r ${ruleset} -s ${configFile} ${doc}`);
+    expect(lint).toBeCalledWith([doc], {
+      encoding: 'utf8',
+      format: ['stylish'],
+      output: { stylish: '<stdout>' },
+      ruleset: 'custom-ruleset.json',
+      stdinFilepath: undefined,
+      ignoreUnknownFormat: false,
+      failOnUnmatchedGlobs: false,
+    });
+  });
+
   it.each(['json', 'stylish'])('calls formatOutput with %s format', async format => {
     await run(`lint -f ${format} ./__fixtures__/empty-oas2-document.json`);
     expect(formatOutput).toBeCalledWith(results, format, { failSeverity: DiagnosticSeverity.Error });
@@ -244,13 +260,13 @@ describe('lint', () => {
     expect(process.stderr.write).nthCalledWith(2, `Error #1: ${chalk.red('some unhandled exception')}\n`);
     expect(process.stderr.write).nthCalledWith(
       3,
-      expect.stringContaining(`packages/cli/src/commands/__tests__/lint.test.ts:236`),
+      expect.stringContaining(`packages/cli/src/commands/__tests__/lint.test.ts:252`),
     );
 
     expect(process.stderr.write).nthCalledWith(4, `Error #2: ${chalk.red('another one')}\n`);
     expect(process.stderr.write).nthCalledWith(
       5,
-      expect.stringContaining(`packages/cli/src/commands/__tests__/lint.test.ts:237`),
+      expect.stringContaining(`packages/cli/src/commands/__tests__/lint.test.ts:253`),
     );
 
     expect(process.stderr.write).nthCalledWith(6, `Error #3: ${chalk.red('original exception')}\n`);

packages/cli/src/commands/lint.ts

@@ -14,6 +14,14 @@ import { formatOutput, writeOutput } from '../services/output';
 import { FailSeverity, ILintConfig, OutputFormat } from '../services/config';
 
 import { CLIError } from '../errors';
+import { ScoringConfig } from './../formatters/types';
+import {
+  getScoringConfig,
+  getScoringLevel,
+  groupBySource,
+  getCountsBySeverity,
+  uniqueErrors,
+} from '../formatters//utils';
 
 const formatOptions = Object.values(OutputFormat);
 
@@ -127,6 +135,11 @@ const lintCommand: CommandModule = {
           description: 'path/URL to a ruleset file',
           type: 'string',
         },
+        'scoring-config': {
+          alias: 's',
+          description: 'path/URL to a scoring config file',
+          type: 'string',
+        },
         'fail-severity': {
           alias: 'F',
           description: 'results of this level or above will trigger a failure exit code',
@@ -168,6 +181,7 @@ const lintCommand: CommandModule = {
       failSeverity,
       displayOnlyFailures,
       ruleset,
+      scoringConfig,
       stdinFilepath,
       format,
       output,
@@ -197,20 +211,30 @@ const lintCommand: CommandModule = {
         results = filterResultsBySeverity(results, failSeverity);
       }
 
+      const scoringConfigData = getScoringConfig(scoringConfig);
+
       await Promise.all(
         format.map(f => {
-          const formattedOutput = formatOutput(results, f, { failSeverity: getDiagnosticSeverity(failSeverity) });
+          const formattedOutput = formatOutput(results, f, {
+            failSeverity: getDiagnosticSeverity(failSeverity),
+            scoringConfig: scoringConfigData,
+          });
           return writeOutput(formattedOutput, output?.[f] ?? '<stdout>');
         }),
       );
 
       if (results.length > 0) {
-        process.exit(severeEnoughToFail(results, failSeverity) ? 1 : 0);
+        process.exit(
+          scoringThresholdNotEnough(results, scoringConfigData) ? 1 : severeEnoughToFail(results, failSeverity) ? 1 : 0,
+        );
       } else if (config.quiet !== true) {
         const isErrorSeverity = getDiagnosticSeverity(failSeverity) === DiagnosticSeverity.Error;
         process.stdout.write(
           `No results with a severity of '${failSeverity}' ${isErrorSeverity ? '' : 'or higher '}found!\n`,
         );
+        if (scoringConfig !== void 0) {
+          process.stdout.write(`SCORING: (100%)\nPASSED!`);
+        }
       }
     } catch (ex) {
       fail(isError(ex) ? ex : new Error(String(ex)), config.verbose === true);
@@ -273,6 +297,25 @@ const filterResultsBySeverity = (results: IRuleResult[], failSeverity: FailSever
   return results.filter(r => r.severity <= diagnosticSeverity);
 };
 
+const scoringThresholdNotEnough = (results: IRuleResult[], scoringConfig: ScoringConfig | undefined): boolean => {
+  if (scoringConfig !== void 0) {
+    const groupedResults = groupBySource(results);
+    let groupedUniqueResults = { ...groupedResults };
+    if (scoringConfig.uniqueErrors) {
+      groupedUniqueResults = { ...groupBySource(uniqueErrors(results)) };
+    }
+    return (
+      scoringConfig.threshold >
+      getScoringLevel(
+        getCountsBySeverity(groupedUniqueResults),
+        scoringConfig.scoringSubtract,
+        scoringConfig.warningsSubtract,
+      )
+    );
+  }
+  return false;
+};
+
 export const severeEnoughToFail = (results: IRuleResult[], failSeverity: FailSeverity): boolean => {
   const diagnosticSeverity = getDiagnosticSeverity(failSeverity);
   return results.some(r => r.severity <= diagnosticSeverity);

packages/cli/src/formatters/json.ts

@@ -1,6 +1,21 @@
-import { Formatter } from './types';
+import { ISpectralDiagnostic } from '@stoplight/spectral-core';
+import { Formatter, FormatterOptions } from './types';
 
-export const json: Formatter = results => {
+import { groupBySource, uniqueErrors, getCountsBySeverity, getScoringText } from './utils';
+
+const version = process.env.npm_package_version;
+
+export const json: Formatter = (results: ISpectralDiagnostic[], options: FormatterOptions) => {
+  let spectralVersion = '';
+  let groupedResults;
+  let scoringText = '';
+  if (options.scoringConfig !== void 0) {
+    if (options.scoringConfig.customScoring !== undefined) {
+      spectralVersion = `${options.scoringConfig.customScoring} ${version as string}`;
+    }
+    groupedResults = groupBySource(uniqueErrors(results));
+    scoringText = getScoringText(getCountsBySeverity(groupedResults), options.scoringConfig);
+  }
   const outputJson = results.map(result => {
     return {
       code: result.code,
@@ -11,5 +26,17 @@ export const json: Formatter = results => {
       source: result.source,
     };
   });
-  return JSON.stringify(outputJson, null, '\t');
+  let objectOutput;
+  if (options.scoringConfig !== void 0) {
+    const scoring = +(scoringText !== null ? scoringText.replace('%', '').split(/[()]+/)[1] : 0);
+    objectOutput = {
+      version: spectralVersion,
+      scoring: scoringText.replace('SCORING:', '').trim(),
+      passed: scoring >= options.scoringConfig.threshold,
+      results: outputJson,
+    };
+  } else {
+    objectOutput = outputJson;
+  }
+  return JSON.stringify(objectOutput, null, '\t');
 };

packages/cli/src/formatters/pretty.ts

@@ -24,22 +24,40 @@
  * @author Ava Thorn
  */
 
+import { ISpectralDiagnostic } from '@stoplight/spectral-core';
 import { printPath, PrintStyle } from '@stoplight/spectral-runtime';
-import { IDiagnostic, IRange } from '@stoplight/types';
+import { IDiagnostic, IRange, DiagnosticSeverity } from '@stoplight/types';
 import chalk from 'chalk';
 
-import { Formatter } from './types';
-import { getColorForSeverity, getHighestSeverity, getSummary, getSeverityName, groupBySource } from './utils';
+import { Formatter, FormatterOptions } from './types';
+import {
+  getColorForSeverity,
+  getHighestSeverity,
+  getSummary,
+  getSeverityName,
+  groupBySource,
+  getScoringText,
+  getCountsBySeverity,
+  uniqueErrors,
+} from './utils';
+
+const { version } = require('../../package.json');
 
 function formatRange(range?: IRange): string {
   if (range === void 0) return '';
 
   return ` ${range.start.line + 1}:${range.start.character + 1}`;
 }
 
-export const pretty: Formatter = results => {
+export const pretty: Formatter = (results: ISpectralDiagnostic[], options: FormatterOptions) => {
   const cliui = require('cliui');
   let output = '\n';
+  if (options.scoringConfig !== void 0) {
+    if (options.scoringConfig.customScoring !== void 0) {
+      output += `${options.scoringConfig.customScoring}${version as string}\n`;
+    }
+  }
+  output += '\n';
   const DEFAULT_TOTAL_WIDTH = process.stdout.columns;
   const COLUMNS = [10, 13, 25, 20, 20];
   const variableColumns = DEFAULT_TOTAL_WIDTH - COLUMNS.reduce((a, b) => a + b);
@@ -50,10 +68,23 @@ export const pretty: Formatter = results => {
   const PAD_TOP1_LEFT0 = [1, 0, 0, 0];
   const ui = cliui({ width: DEFAULT_TOTAL_WIDTH, wrap: true });
 
+  const uniqueResults = uniqueErrors(results);
   const groupedResults = groupBySource(results);
-  const summaryColor = getColorForSeverity(getHighestSeverity(results));
+  const summaryColor = getColorForSeverity(getHighestSeverity(uniqueResults));
   const summaryText = getSummary(groupedResults);
 
+  let groupedUniqueResults = { ...groupedResults };
+  let scoringColor = '';
+  let scoringText = null;
+
+  if (options.scoringConfig !== void 0) {
+    if (options.scoringConfig.uniqueErrors) {
+      groupedUniqueResults = { ...groupBySource(uniqueResults) };
+    }
+    scoringColor = getColorForSeverity(DiagnosticSeverity.Information);
+    scoringText = getScoringText(getCountsBySeverity(groupedUniqueResults), options.scoringConfig);
+  }
+
   const uniqueIssues: IDiagnostic['code'][] = [];
   Object.keys(groupedResults).forEach(i => {
     const pathResults = groupedResults[i];
@@ -83,6 +114,15 @@ export const pretty: Formatter = results => {
   output += ui.toString();
   output += chalk[summaryColor].bold(`${uniqueIssues.length} Unique Issue(s)\n`);
   output += chalk[summaryColor].bold(`\u2716${summaryText !== null ? ` ${summaryText}` : ''}\n`);
+  if (options.scoringConfig !== void 0) {
+    output += chalk[scoringColor].bold(`\u2716${scoringText !== null ? ` ${scoringText}` : ''}\n`);
+    const scoring = +(scoringText !== null ? scoringText.replace('%', '').split(/[()]+/)[1] : 0);
+    if (scoring >= options.scoringConfig.threshold) {
+      output += chalk['green'].bold(`\u2716 PASSED!\n`);
+    } else {
+      output += chalk['red'].bold(`\u2716 NOT PASSED!\n`);
+    }
+  }
 
   return output;
 };