如何评论 github 上 PR 的特定行号

How to comment on a specific line number on a PR on github

我正在尝试编写一个小脚本,可以使用 eslint 输出对 github PR 发表评论。

问题是 eslint 为我提供了每个错误的绝对行号。 但是 github API 想要相对于差异的行号。

来自 github API 文档:https://developer.github.com/v3/pulls/comments/#create-a-comment

To comment on a specific line in a file, you will need to first determine the position in the diff. GitHub offers a application/vnd.github.v3.diff media type which you can use in a preceding request to view the pull request's diff. The diff needs to be interpreted to translate from the line in the file to a position in the diff. The position value is the number of lines down from the first "@@" hunk header in the file you would like to comment on.

The line just below the "@@" line is position 1, the next line is position 2, and so on. The position in the file's diff continues to increase through lines of whitespace and additional hunks until a new file is reached.

所以如果我想在上图中的第 5 行添加评论,那么我需要将 12 传递给 API

我的问题是如何轻松地将 eslint 在其错误消息中给出的新行号映射到 github API

所需的相对行号

到目前为止我尝试了什么

我正在使用 parse-diff 将 github API 提供的差异转换为 json 对象

[{
  "chunks": [{
    "content": "@@ -,OLD_TOTAL_LINES +NEW_STARTING_LINE_NUMBER,NEW_TOTAL_LINES @@",
    "changes": [
    {
      "type": STRING("normal"|"add"|"del"),
      "normal": BOOLEAN,
      "add": BOOLEAN,
      "del": BOOLEAN,
      "ln1": OLD_LINE_NUMBER,
      "ln2": NEW_LINE_NUMBER,
      "content": STRING,
      "oldStart": NUMBER,
      "oldLines": NUMBER,
      "newStart": NUMBER,
      "newLines": NUMBER
    }
  }]
}]

我在想下面的算法

我找到了解决办法。我没有把它放在这里,因为它涉及简单的循环,没有什么特别的。但无论如何现在回答以帮助他人。

我已经打开了一个拉取请求来创建问题中所示的类似情况 https://github.com/harryi3t/5134/pull/7/files

使用 Github API 可以得到差异数据。

diff --git a/test.js b/test.js
index 2aa9a08..066fc99 100644
--- a/test.js
+++ b/test.js
@@ -2,14 +2,7 @@

 var hello = require('./hello.js');

-var names = [
-  'harry',
-  'barry',
-  'garry',
-  'harry',
-  'barry',
-  'marry',
-];
+var names = ['harry', 'barry', 'garry', 'harry', 'barry', 'marry'];

 var names2 = [
   'harry',
@@ -23,9 +16,7 @@ var names2 = [
 // after this line new chunk will be created
 var names3 = [
   'harry',
-  'barry',
-  'garry',
   'harry',
   'barry',
-  'marry',
+  'marry', 'garry',
 ];

现在只需将此数据传递给 diff-parse 模块并进行计算。

var parsedFiles = parseDiff(data); // diff output
parsedFiles.forEach(
  function (file) {
    var relativeLine = 0;
    file.chunks.forEach(
      function (chunk, index) {
        if (index !== 0)  // relative line number should increment for each chunk
          relativeLine++; // except the first one (see rel-line 16 in the image)
        chunk.changes.forEach(
          function (change) {
            relativeLine++;
            console.log(
             change.type,
             change.ln1 ? change.ln1 : '-',
             change.ln2 ? change.ln2 : '-',
             change.ln ? change.ln : '-',
             relativeLine
           );
          }
        );
      }
    );
  }
);

这将打印

type    (ln1) old line   (ln2) new line   (ln) added/deleted line    relative line
normal     2                  2                 -                       1
normal     3                  3                 -                       2
normal     4                  4                 -                       3
del        -                  -                 5                       4
del        -                  -                 6                       5
del        -                  -                 7                       6
del        -                  -                 8                       7
del        -                  -                 9                       8
del        -                  -                 10                      9
del        -                  -                 11                      10
del        -                  -                 12                      11
add        -                  -                 5                       12
normal     13                 6                 -                       13
normal     14                 7                 -                       14
normal     15                 8                 -                       15
normal     23                 16                -                       17
normal     24                 17                -                       18
normal     25                 18                -                       19
del        -                   -                26                      20
del        -                   -                27                      21
normal     28                 19                -                       22
normal     29                 20                -                       23
del        -                  -                 30                      24
add        -                  -                 21                      25
normal     31                 22                -                       26

现在您可以使用相对行号来 post 使用 github api 的评论。

为了我的目的,我只需要新添加行的相对行号,但是使用上面的 table 也可以为删除的行获取它。

这是我在其中使用它的 linting 项目的 link。 https://github.com/harryi3t/lint-github-pr