Emacs Org Mode：用noweb调用带参数src块生成表格报错求排查

It looks like the main issue is how you're trying to pass arguments to your gdt code block using noweb—Org Mode's noweb syntax doesn't support direct argument passing like <<gdt("14-05-2018")>>. Here's why that's causing a syntax error, and how to fix it:

First, when you write <<gdt("14-05-2018")>>, Org Mode doesn't recognize this as a valid noweb reference (since reference names can't include parentheses or arguments). Instead of replacing it with your gdt block's code, it leaves that line as-is in your Ruby code. Ruby then interprets << as the left-shift operator followed by gdt("14-05-2018")—which is invalid syntax, hence the error.

Here's the correct approach to make this work:

Step 1: Define your gdt block with a parameter #

First, ensure your gdt code block declares the date parameter using the :var header argument. This tells Org Mode the block accepts a variable named date that you can pass from other blocks.

Example gdt block:
#+BEGIN_SRC ruby :var date="01-01-2024" :results output org
require 'date'

parsed_date = Date.strptime(date, "%d-%m-%Y")

puts "| Date | Day of Week | Month |"
puts "|------------|-------------|-------------|"
puts "| #{parsed_date.strftime("%d-%m-%Y")} | #{parsed_date.strftime("%A")} | #{parsed_date.strftime("%B")} |"
#+END_SRC

Step 2: Call gdt from another block using noweb #

To call this block and pass a specific date, use the :var header argument in your calling block to set the date value, then reference <<gdt>> (without arguments). Org Mode will automatically pass the date value from the calling block to the gdt block during evaluation.

Example calling block:
#+BEGIN_SRC ruby :noweb eval :var date="14-05-2018" :results output org
<>
#+END_SRC

When you evaluate this calling block, Org Mode will run the gdt block with date set to "14-05-2018" and output the generated Org table as expected.

Alternative: Inline variable override #

If you want to hardcode the date directly in the noweb context (instead of using :var), you can define a snippet that sets the date variable before calling gdt—just make sure your gdt block either doesn't have a :var date=... declaration, or that the inline assignment overrides it:

#+BEGIN_SRC ruby :noweb eval :results output org
date = "14-05-2018"
<>
#+END_SRC

That should resolve the syntax error and let you generate your Org table correctly!

内容的提问来源于stack exchange，提问作者osadasami