How to add a header to CSV export in jq?

问题

I'm taking a modified command from the jq tutorial:

curl 'https://api.github.com/repos/stedolan/jq/commits?per_page=5' \
| jq -r -c '.[] | {message: .commit.message, name: .commit.committer.name} | [.[]] | @csv'

Which does csv export well, but missing the headers as the top:

"Fix README","Nicolas Williams"
"README: send questions to SO and Freenode","Nicolas Williams"
"usage() should check fprintf() result (fix #771)","Nicolas Williams"
"Use jv_mem_alloc() in compile.c (fix #771)","Nicolas Williams"
"Fix header guards (fix #770)","Nicolas Williams"

How can I add the header (in this case message,name) at the top? (I know it's possible manually, but how to do it within jq?)

回答1:

Based on Anton's comments on Jeff Mercado's answer, this snippet will get the key names of the properties of the first element and output them as an array before the rows, thus using them as headers. If different rows have different properties, then it won't work well; then again, neither would the resulting CSV.

map({message: .commit.message, name: .commit.committer.name}) | (.[0] | to_entries | map(.key)), (.[] | [.[]]) | @csv

来源：https://stackoverflow.com/questions/30015555/how-to-add-a-header-to-csv-export-in-jq