dfdc07cbfa
Code is not used anywhere yet, but the end goal is: * Replace the bash-style algorithm with a less kludgy one * Add the ability to customize tab completion method (will also include default zsh-style completion) * Abstract tab completion so it can be shared for chat and emote names as available options
83 lines
2.6 KiB
JavaScript
83 lines
2.6 KiB
JavaScript
CyTube.tabCompleteMethods = {};
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// Bash-style completion
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// Only completes as far as it is possible to maintain uniqueness of the completion.
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CyTube.tabCompleteMethods['Longest unique prefix'] = function (input, position, options, context) {
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var lower = input.toLowerCase();
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// First, backtrack to the nearest whitespace to find the
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// incomplete string that should be completed.
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var start;
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var incomplete = '';
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for (start = position - 1; start >= 0; start--) {
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if (/\s/.test(lower[start])) {
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start++;
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break;
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}
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incomplete = lower[start] + incomplete;
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}
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// Nothing to complete
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if (!incomplete.length) {
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return {
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text: input,
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newPosition: position
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};
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}
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var matches = options.filter(function (option) {
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return option.toLowerCase().indexOf(incomplete) === 0;
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});
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var completed;
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var isFullMatch = false;
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if (matches.length === 0) {
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return {
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text: input,
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newPosition: position
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};
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} else if (matches.length === 1) {
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// Unique match
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completed = matches[0];
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isFullMatch = true;
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} else {
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// There is not a unique match, find the longest possible prefix
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// that results in a unique completion
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// Do this by comparing each match to the next and trimming to the
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// first index where they differ.
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var currentPrefix = null;
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for (var i = 0; i < matches.length - 1; i++) {
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var first = matches[i];
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var second = matches[i+1];
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var nextPrefix = '';
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for (var j = 0; (currentPrefix === null || j < currentPrefix.length)
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&& j < first.length
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&& j < second.length; j++) {
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if (first[j].toLowerCase() === second[j].toLowerCase()) {
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nextPrefix += first[j];
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} else {
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break;
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}
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}
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if (currentPrefix === null || nextPrefix.length < currentPrefix.length) {
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currentPrefix = nextPrefix;
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}
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}
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completed = currentPrefix;
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}
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var space = isFullMatch ? ' ' : '';
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return {
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text: input.substring(0, start) + completed + space + input.substring(position),
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newPosition: start + completed.length + space.length
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};
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};
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// Zsh-style completion.
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// Always complete a full option, and cycle through available options on successive tabs
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CyTube.tabCompleteMethods['Cycle options'] = function (input, position, options, context) {
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};
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