86 lines
1.8 KiB
Go
86 lines
1.8 KiB
Go
/*
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filter --- Simple interactive data filter for POSIX pipelines
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Copyright (c) 2022 Sameer Rahmani <lxsameer@gnu.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package main
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import (
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"bufio"
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"fmt"
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"io"
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"os"
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)
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type Item struct {
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Text string
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Selected bool
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}
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type Items = *[]*Item
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func NewItem(text string) *Item {
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return &Item{
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Text: text,
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Selected: false,
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}
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}
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func toggleItems(items Items, start int, end int) {
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for _, item := range (*items)[start:end] {
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item.Selected = !item.Selected
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}
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}
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// Pffff Golang, right? :D
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func min(a, b int) int {
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if a < b {
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return a
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}
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return b
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}
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func max(a, b int) int {
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if a > b {
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return a
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}
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return b
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}
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// Reads the input from stdin and makes sure that the current
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// process is being run in a pipeline and converts the data
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// to an array of items.
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func ReadFromStdin() (Items, error) {
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info, err := os.Stdin.Stat()
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if err != nil {
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panic(err)
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}
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if info.Mode()&os.ModeCharDevice != 0 {
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return nil, fmt.Errorf("the command is intended to work with pipes. For example `git log | filter | xarg | ...`")
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}
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reader := bufio.NewReader(os.Stdin)
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var output []*Item
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for {
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input, _, err := reader.ReadLine()
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if err != nil && err == io.EOF {
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break
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}
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item := NewItem(string(input))
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output = append(output, item)
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}
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return &output, nil
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}
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