Calibre ebook-找不到转换命令

Question

我正在学习Avdi Grimm关于Rake的教程系列，但我被Part 6卡住了。调用Pandoc的任务工作正常，但Calibre的ebook-convert命令返回状态127：

andrekibbe@Andres-MacBook rake_basics (master) $ rake
pandoc -o ch1.html ch1.md
pandoc -o ch2.html ch2.md
pandoc -o ch3.html ch3.md
pandoc -o subdir/appendix.html subdir/appendix.md
pandoc -o ch4.html ch4.markdown
cat ch1.html ch2.html ch3.html ch4.html  > book.html
ebook-convert book.html book.epub
rake aborted!
Command failed with status (127): [ebook-convert book.html book.epub...]
/Users/andrekibbe/code/rake_basics/Rakefile:27:in `block in <top (required)>'
/Users/andrekibbe/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:in `eval'
/Users/andrekibbe/.rvm/gems/ruby-2.2.1/bin/ruby_executable_hooks:15:in `<main>'
Tasks: TOP => default => book.epub

ebook-convert在我的应用程序目录的路径中：/Applications/calibre.app/Contents/MacOS/calibre，而我的Rakefile在/Users/andrekibbe/code/rake_basics中

require "rake/clean"

SOURCE_FILES = Rake::FileList.new("**/*.md", "**/*.markdown") do |fl|
  fl.exclude("~*")
  fl.exclude(/^scratch\//)
  fl.exclude do |f|
    `git ls-files #{f}`.empty?
  end
end
CLEAN.include(SOURCE_FILES.ext(".html"))

task default: ["book.epub", "book.mobi"]
task html: SOURCE_FILES.ext(".html")

rule ".html" => ->(f){source_for_html(f)} do |t|
  sh "pandoc -o #{t.name} #{t.source}"
end

file "book.html" => SOURCE_FILES.ext(".html") do |t|
  chapters   = FileList["**/ch*.html"]
  backmatter = FileList["backmatter/*.html"]
  sh "cat #{chapters} #{backmatter} > #{t.name}"
end
CLEAN.include("book.html")

file "book.epub" => "book.html" do |t|
  sh "ebook-convert book.html #{t.name}"
end
CLOBBER.include("book.epub")

file "book.mobi" => "book.epub" do |t|
  sh "kindlegen book.epub -o #{t.name}"
end
CLOBBER.include("book.mobi")

def source_for_html(html_file)
  SOURCE_FILES.detect{|f| f.ext('') == html_file.ext('')}
end

有没有办法要求Rakefile中的Calibre工具，比如gem，或者使用绝对路径或符号链接？我不认为这应该是必要的，因为在Avdi的代码中没有这样的东西。或者我需要在其他地方安装Calibre？

Answer 1

退出代码127是“未找到命令”。http://otaku-elite.com/blog/2013/06/06/rake-status-127/

作为第一步，您可以尝试将电子书转换为的，然后使用完整路径。

Answer 2

这是因为ebook-convert不在path中。您应该使用ebook-convert的完整路径或将其添加到路径中。

改变你的

ebook-convert book.html book.epub

至

/Applications/calibre.app/Contents/MacOS/ebook-convert book.html book.epub

或者将本地添加到/usr/ ln /bin，然后重试

sudo ln -s /Applications/calibre.app/Contents/MacOS/ebook-convert /usr/local/bin