mirror of
https://github.com/siyuan-note/siyuan.git
synced 2025-05-04 17:51:49 +08:00
106 lines
2.7 KiB
Go
106 lines
2.7 KiB
Go
// SiYuan - Build Your Eternal Digital Garden
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// Copyright (c) 2020-present, b3log.org
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//
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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 Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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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 Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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package util
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import (
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"bytes"
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"context"
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"os"
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"os/exec"
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"regexp"
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"strings"
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"time"
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"github.com/88250/gulu"
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"github.com/dgraph-io/ristretto"
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"github.com/siyuan-note/logging"
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)
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var tesseractEnabled bool
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func initTesseract() {
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ver := getTesseractVer()
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if "" == ver {
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return
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}
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logging.LogInfof("tesseract-ocr enabled [ver=%s]", ver)
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}
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func getTesseractVer() (ret string) {
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cmd := exec.Command("tesseract", "--version")
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gulu.CmdAttr(cmd)
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data, err := cmd.CombinedOutput()
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if nil == err && strings.HasPrefix(string(data), "tesseract v") {
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parts := bytes.Split(data, []byte("\n"))
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if 0 < len(parts) {
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ret = strings.TrimPrefix(string(parts[0]), "tesseract ")
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ret = strings.TrimSpace(ret)
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tesseractEnabled = true
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}
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return
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}
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return
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}
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var ocrResultCache, _ = ristretto.NewCache(&ristretto.Config{
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NumCounters: 100000,
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MaxCost: 1000 * 1000 * 64,
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BufferItems: 64,
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})
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func Tesseract(imgAbsPath string) string {
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if ContainerStd != Container || !tesseractEnabled {
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return ""
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}
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info, err := os.Stat(imgAbsPath)
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if nil != err {
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return ""
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}
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cached, ok := ocrResultCache.Get(imgAbsPath)
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if ok {
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return cached.(string)
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}
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defer logging.Recover()
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ctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)
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defer cancel()
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cmd := exec.CommandContext(ctx, "tesseract", "-c", "debug_file=/dev/null", imgAbsPath, "stdout", "-l", "chi_sim+eng")
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gulu.CmdAttr(cmd)
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output, err := cmd.CombinedOutput()
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if ctx.Err() == context.DeadlineExceeded {
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logging.LogWarnf("tesseract [path=%s, size=%d] timeout", imgAbsPath, info.Size())
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return ""
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}
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if nil != err {
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logging.LogWarnf("tesseract [path=%s, size=%d] failed: %s", imgAbsPath, info.Size(), err)
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return ""
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}
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ret := string(output)
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reg := regexp.MustCompile("\\s+")
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ret = reg.ReplaceAllString(ret, "")
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logging.LogInfof("tesseract [path=%s, size=%d]: %s", imgAbsPath, info.Size(), ret)
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ocrResultCache.Set(imgAbsPath, ret, info.Size())
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return ret
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}
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