1.0.0

.gitignore

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+.nyc_output/
+node_modules/
+*.tar.gz
+*.log
+.DS_Store

.travis.yml

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+language: node_js
+node_js:
+  - "9"
+  - "8"
+  - "7"
+  - "6"
+install: npm install
+test: npm test

LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2018 Tom Hummel
+
+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.

README.md

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+# streak
+
+gather streaks from an ordered json array on stdin. results are printed in json to stdout.
+
+[![Build Status](https://travis-ci.org/tphummel/streak.svg?branch=master)](https://travis-ci.org/tphummel/streak)
+
+### setup
+
+with npm:
+```
+npm install --global @tphummel/streak
+```
+
+or with homebrew:
+
+```
+brew install tphummel/util/streak
+```
+
+or download a standalone [executable](https://github.com/tphummel/streak/releases/latest) for your system. Put the file (or link) on your $PATH.
+
+### usage
+
+```
+streak --help
+```
+
+### definitions
+- streak: two or more consecutive rows that satisfy the criteria
+- active streak: a streak which is still active as of the final provided row
+
+### scope/limits
+- the rows from stdin must be filled if it contains sparse data
+- the rows from stdin must be ordered from oldest to newest
+- the data from stdin must be filtered to include only relevant rows
+- stdout streaks list is not ordered

cli.js

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+#!/usr/bin/env node
+
+'use strict'
+
+const minimist = require('minimist')
+const getStdin = require('get-stdin')
+
+const lib = require('./index')
+
+const argv = minimist(process.argv, {
+  string: ['label', 'column', 'min', 'max'],
+  boolean: ['help', 'version'],
+  alias: {
+    l: 'label',
+    c: 'column',
+    h: 'help',
+    v: 'version'
+  },
+  default: {
+    label: 0,
+    column: 1,
+    min: 1
+  }
+})
+
+if (argv.help) {
+  printUsage()
+  process.exit(0)
+}
+
+if (argv.version) {
+  console.log(require('./package.json').version)
+  process.exit(0)
+}
+
+getStdin().then(str => {
+  try {
+    var input = JSON.parse(str)
+  } catch (e) {
+    console.log(`stdin was not valid valid json. failed to parse`)
+    process.exit(1)
+  }
+
+  const result = lib({
+    data: input,
+    displayColumn: argv.label,
+    criteria: {
+      column: argv.column,
+      minValue: argv.min,
+      maxValue: argv.max
+    }
+  })
+  console.log(JSON.stringify(result))
+})
+
+function printUsage () {
+  const usage = `
+  Streak.
+
+  Usage:
+    streak --label|-l <idx> --column|-c <idx> --min <val> [--max <val>]
+    streak -h | --help
+    streak -v | --version
+
+  Options:
+    -l --label    index of column holding label. zero-indexed. [default: 0]
+    -c --column   index of column holding criteria. zero-indexed. [default: 1]
+    --min         Numeric criteria to evaluate criteria field (>=). [default: 1]
+    --max         Numeric criteria to evaluate criteria field (<=)
+
+    -h --help     Show this screen.
+    -v --version  Show version.
+
+  Example:
+    echo -n '[["2017-01-01", 3],["2017-01-02", 5],["2017-01-03", 5],["2017-01-07", 1]]' \\
+      | streak -l 0 -c 1 --min 5
+  `
+  console.log(usage)
+}

index.js

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+'use strict'
+
+function rowSatisfiesCriteria ({row, criteria}) {
+  if (criteria && criteria.minValue != null) {
+    if (row[criteria.column] < criteria.minValue) {
+      return false
+    }
+  }
+
+  if (criteria && criteria.maxValue != null) {
+    if (row[criteria.column] > criteria.maxValue) {
+      return false
+    }
+  }
+
+  return true
+}
+
+function getStreaks ({data, displayColumn, criteria}) {
+  let streaks = []
+  let active = []
+  const minStreakLength = 2
+
+  data.forEach(row => {
+    let streakInProgress = active.length > 0
+    let criteriaSatisfied = rowSatisfiesCriteria({row, criteria})
+
+    if (streakInProgress) {
+      if (criteriaSatisfied) {
+        active.push(row)
+      } else {
+        if (active.length >= minStreakLength) streaks.push(active)
+        active = []
+      }
+    } else {
+      if (criteriaSatisfied) active.push(row)
+    }
+  })
+
+  let output = streaks.map(raw => {
+    return {
+      start: raw[0][displayColumn],
+      end: raw[raw.length - 1][displayColumn],
+      value: raw.length,
+      active: false
+    }
+  })
+
+  if (active.length >= minStreakLength) {
+    output.push({
+      start: active[0][displayColumn],
+      end: active[active.length - 1][displayColumn],
+      value: active.length,
+      active: true
+    })
+  }
+
+  return output
+}
+
+module.exports = getStreaks
+module.exports.rowSatisfiesCriteria = rowSatisfiesCriteria