// Verify that hl_lines attributes in markdown code blocks correctly highlight the intended lines. Use when reviewing documentation with code examples, especially Before/After comparisons, or when highlights seem incorrect.
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| name | Check Code Block Highlights |
| description | Verify that hl_lines attributes in markdown code blocks correctly highlight the intended lines. Use when reviewing documentation with code examples, especially Before/After comparisons, or when highlights seem incorrect. |
Verify that hl_lines attributes in markdown code blocks are correctly set to highlight the intended lines.
See ../shared/repo-conventions.md for file conventions.
hl_lines is snippet-relative, NOT related to linenums:
linenums="21" sets the displayed starting line numberhl_lines="3" highlights the 3rd line of the snippet (which displays as line 23)Example:
`groovy linenums="21" hl_lines="3"
process FOO { <- displayed as line 21 (snippet line 1)
input: <- displayed as line 22 (snippet line 2)
val x <- displayed as line 23 (snippet line 3) - HIGHLIGHTED
}
`
For each code block with hl_lines:
Identify the code block - Find blocks with hl_lines="..." attribute
Count snippet lines - Number each line of the code block starting from 1:
1: #!/usr/bin/env nextflow
2: (blank line)
3: process FOO {
4: publishDir 'results' <- if this should be highlighted, hl_lines should include "4"
...
Verify intent - For Before/After blocks:
Check for common errors:
linenums with hl_lines (thinking hl_lines="21" highlights displayed line 21)input:, output:) instead of the actual valuesWhen you find incorrect highlights:
hl_lines to reference those snippet line numbersFor each file checked, report:
## [filename]
### Block at line [N]: [description]
- Current: hl_lines="X Y Z"
- Lines X, Y, Z contain: [what's on those lines]
- Issue: [description of problem, if any]
- Suggested fix: hl_lines="A B C" (highlighting [what those lines contain])
### Summary
- Blocks checked: N
- Issues found: M
- [List of fixes needed]
Given this code block:
`groovy title="example.nf" linenums="1" hl_lines="8 11 14"
#!/usr/bin/env nextflow <- snippet line 1
<- snippet line 2 (blank)
process SAY_HELLO { <- snippet line 3
<- snippet line 4 (blank)
publishDir 'results' <- snippet line 5
<- snippet line 6 (blank)
input: <- snippet line 7
val greeting <- snippet line 8 - HIGHLIGHTED
<- snippet line 9 (blank)
output: <- snippet line 10
path "*.txt" <- snippet line 11 - HIGHLIGHTED
<- snippet line 12 (blank)
script: <- snippet line 13
"""echo hi""" <- snippet line 14 - HIGHLIGHTED
}
`
Analysis: hl_lines="8 11 14" correctly highlights the input value (line 8), output value (line 11), and script content (line 14).