diff options
Diffstat (limited to 'tools/node_modules/eslint/node_modules/inquirer/lib/utils/paginator.js')
-rw-r--r-- | tools/node_modules/eslint/node_modules/inquirer/lib/utils/paginator.js | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/tools/node_modules/eslint/node_modules/inquirer/lib/utils/paginator.js b/tools/node_modules/eslint/node_modules/inquirer/lib/utils/paginator.js new file mode 100644 index 0000000000..fc7ebe0669 --- /dev/null +++ b/tools/node_modules/eslint/node_modules/inquirer/lib/utils/paginator.js @@ -0,0 +1,38 @@ +'use strict'; + +var _ = require('lodash'); +var chalk = require('chalk'); + +/** + * The paginator keeps track of a pointer index in a list and returns + * a subset of the choices if the list is too long. + */ + +var Paginator = module.exports = function () { + this.pointer = 0; + this.lastIndex = 0; +}; + +Paginator.prototype.paginate = function (output, active, pageSize) { + pageSize = pageSize || 7; + var middleOfList = Math.floor(pageSize / 2); + var lines = output.split('\n'); + + // Make sure there's enough lines to paginate + if (lines.length <= pageSize) { + return output; + } + + // Move the pointer only when the user go down and limit it to the middle of the list + if (this.pointer < middleOfList && this.lastIndex < active && active - this.lastIndex < pageSize) { + this.pointer = Math.min(middleOfList, this.pointer + active - this.lastIndex); + } + this.lastIndex = active; + + // Duplicate the lines so it give an infinite list look + var infinite = _.flatten([lines, lines, lines]); + var topIndex = Math.max(0, active + lines.length - this.pointer); + + var section = infinite.splice(topIndex, pageSize).join('\n'); + return section + '\n' + chalk.dim('(Move up and down to reveal more choices)'); +}; |