使用源映射编译LESS文件

更新:新的最短答案

文档已更新!随着LESS的新功能的出现,有时候文档会稍微落后一些,所以如果你正在寻找最前沿的功能,你仍然可能会更好地运行lessc(查看更长的答案)并检查帮助文本中弹出的内容.

http://lesscss.org/usage/

简短的回答

您正在从命令行中查找以下任意数量的选项:

--source-map[=FILENAME]  Outputs a v3 sourcemap to the filename (or output filename.map)
--source-map-rootpath=X  adds this path onto the sourcemap filename and less file paths
--source-map-basepath=X  Sets sourcemap base path, defaults to current working directory.
--source-map-less-inline puts the less files into the map instead of referencing them
--source-map-map-inline  puts the map (and any less files) into the output css file
--source-map-url=URL     the complete url and filename put in the less file

在我写这篇文章时,我不知道任何生成地图的GUI选项(源地图在过去几个月里只被添加到LESS) - 抱歉没有任何更好的消息.我相信他们会在明年更新时增加支持.

更长的答案

如果从命令行运行lessc而没有任何参数,它将为您提供所有选项.(根据我的经验,这比他们的文档更新,因此它至少会让你指向正确的方向.)包含所有最新的地图内容.

用于开发的最简单的组合就是--source-map-less-inline --source-map-map-inline为您提供嵌入在输出css中的源映射.

如果你想添加一个单独的地图文件,你可以使用--source-map哪个,来自my.less输出my.css和my.css.map

供参考:当我运行我的副本时(目前为1.6.1)我得到了

usage: lessc [option option=parameter ...] <source> [destination]

If source is set to `-' (dash or hyphen-minus), input is read from stdin.
options:
  -h, --help               Print help (this message) and exit.
  --include-path=PATHS     Set include paths. Separated by `:'. Use `;' on Windows.
  -M, --depends            Output a makefile import dependency list to stdout
  --no-color               Disable colorized output.
  --no-ie-compat           Disable IE compatibility checks.
  --no-js                  Disable JavaScript in less files
  -l, --lint               Syntax check only (lint).
  -s, --silent             Suppress output of error messages.
  --strict-imports         Force evaluation of imports.
  --insecure               Allow imports from insecure https hosts.
  -v, --version            Print version number and exit.
  -x, --compress           Compress output by removing some whitespaces.
  --clean-css              Compress output using clean-css
  --clean-option=opt:val   Pass an option to clean css, using CLI arguments from
                           https://github.com/GoalSmashers/clean-css e.g.
                           --clean-option=--selectors-merge-mode:ie8
                           and to switch on advanced use --clean-option=--advanced
  --source-map[=FILENAME]  Outputs a v3 sourcemap to the filename (or output filename.map)
  --source-map-rootpath=X  adds this path onto the sourcemap filename and less file paths
  --source-map-basepath=X  Sets sourcemap base path, defaults to current working directory.
  --source-map-less-inline puts the less files into the map instead of referencing them
  --source-map-map-inline  puts the map (and any less files) into the output css file
  --source-map-url=URL     the complete url and filename put in the less file
  -rp, --rootpath=URL      Set rootpath for url rewriting in relative imports and urls.
                           Works with or without the relative-urls option.
  -ru, --relative-urls     re-write relative urls to the base less file.
  -sm=on|off               Turn on or off strict math, where in strict mode, math
  --strict-math=on|off     requires brackets. This option may default to on and then
                           be removed in the future.
  -su=on|off               Allow mixed units, e.g. 1px+1em or 1px*1px which have units
  --strict-units=on|off    that cannot be represented.
  --global-var='VAR=VALUE' Defines a variable that can be referenced by the file.
  --modify-var='VAR=VALUE' Modifies a variable already declared in the file.

-------------------------- Deprecated ----------------
  -O0, -O1, -O2            Set the parser's optimization level. The lower
                           the number, the less nodes it will create in the
                           tree. This could matter for debugging, or if you
                           want to access the individual nodes in the tree.
  --line-numbers=TYPE      Outputs filename and line numbers.
                           TYPE can be either 'comments', which will output
                           the debug info within comments, 'mediaquery'
                           that will output the information within a fake
                           media query which is compatible with the SASS
                           format, and 'all' which will do both.
  --verbose                Be verbose.

如果命令行不适合你,Grunt就是这种类型的东西.您可以配置grunt-contrib-less插件以使用如下配置生成内联映射:

 less: {
        options: {
            sourceMap:true,
            outputSourceFiles: true
        },
        lessFiles: {
            expand: true,
            flatten:false,
            src: ['**/*.less'],
            dest: ['dist/'],
            ext: '.css',
        }
    },

https://github.com/gruntjs/grunt-contrib-less