How to check during “pre_get_posts” if WP performing default query for specific custom template?

As you describe the timing would not quite work. During WP core load:

  1. main query is created and processed into query variables (with pre_get_posts being one of the hooks able to influence the results)
  2. then template-loader.php uses conditionals (dependent on those query variables) to determine template to use

So at the point of pre_get_posts you cannot technically check for template choice, because that is not happened yet. However what you can check for – is query variables are those that correspond with that template being chosen down the road. Which is practically quite close.

Related Posts:

  1. Looking for WordPress System Diagrams
  2. How can I load a page template from a plugin?
  3. Overwrite theme file from plugin
  4. How to control output of custom post type without modifying theme?
  5. When is it appropriate to put functions on page template vs. functions.php?
  6. Filter to change the content of 404 page
  7. Change of query var in pre_get_posts not maintained
  8. How to properly use a hook to create template for custom product type in a plugin such as Woocommerce? [closed]
  9. How to check active theme is parent or child wordpress
  10. WordPress removing data attributes for scheduled post
  11. Is there a way to loop through a shortcode datasource to create a table?
  12. creating custom archive template within plugin for custom post type using archive_template filter
  13. Where to call wp_enqueue_script in a plugin with custom template?
  14. Can Page Templates be Applied to Archive and Post Templates?
  15. ORDER BY wp_post custom column name in wp_query
  16. Create a free scripts and styles template within a plugin
  17. How can I turn a custom wordpress page into a product page?
  18. pre_get_post alter current post id
  19. Plugin templates vs Parent Theme
  20. How to make “upgrade safe” theme for a plugin?
  21. What action hook can I use to add a JavaScript to a page post using a theme template that is not including get_header() nor get_footer()?
  22. How to create templates for a custom module to show on the front end within my theme?
  23. Why aren’t some plugin styles loading when I load a template?
  24. Plugin custom post template; without overriding all posts
  25. Best way to distribute templates and code accross multiple wordpress sites?
  26. Load php file with jquery in single.php
  27. Setting post_id for single.php based on URL without a redirect
  28. Overriding the template files using a plugin for all themes
  29. How do I use a plugin to swap out the template file for a custom post type?
  30. Add WordPress Meta Box saved form input to WordPress RSS feed [duplicate]
  31. Javascript not being loaded only in custom taxonomy template
  32. Add new header/footer on landing page with plugin
  33. Use a page as a template for a custom post type
  34. Page template compatibility with different themes
  35. How to set custom homepage via a plugin
  36. Template file structure , wordpress hook for altering the template
  37. Can a plugin differentiate syndication feeds from actual site views?
  38. How to use get_pages( ) correctly with ‘child_of’ to replace page with child page
  39. Displaying External Data – Not Posts
  40. Making plugin output customizable
  41. Use different archive template for plugin
  42. How to display custom taxonomy and terms using/creating plugin template
  43. WP Job Manager – Show recent jobs as cards
  44. Help interpreting @wordpress/create-block-tutorial-template usage error
  45. Update Option Stored in Multi-Dimensional Array
  46. Best practices for using the transients API
  47. $wpdb->insert_id
  48. Remove profile picture option (and other things) from profile.php (in admin)
  49. How Can I Add a Filter to Class Instance Only?
  50. Getting old term value with edited_{$taxonomy} | Hook
  51. Call activation hook multiple times
  52. Adding custom code into header.php using a plugin
  53. Two-step login process – Is it possible?
  54. Unified Approach for Placing Option Pages
  55. Define a function outside a class and call the function using action or filter hook
  56. Modifying WordPress plugins
  57. On plugin deactivation hide its shortcode
  58. Can I submit a plugin that follows the PSR-2 coding style guide?
  59. Verify Nonce returns false – Request Nonce returns correct value
  60. How to untrash a post only if it was not a draft?
  61. Can I change header.php of current theme through a plugin function?
  62. Gutenberg blocks not getting styled on back end
  63. Writing a plugin which needs to upload files
  64. Calling is_single() outside the loop
  65. update woocommere total value on checkout based on selected payment method
  66. Add a Save Button to Custom Meta Box [duplicate]
  67. Gutenberg: import dependency or assign from global variable?
  68. Following WordPress Markup Is mandatory, got awkward resultyby wordpress standard markup?
  69. Steps to Update a WordPress Plugin That We Developed
  70. Using WAMP, trying to create a plugin, getting error: You do not have sufficient permissions to access this page
  71. Loading Modernizr (or other JavaScript libraries) for use in a plugin
  72. Issue on Setting $icon_url Parameter on WP add_menu_page()
  73. I have this error notice ‘wp_enqueue_script was called incorrectly’ in my plugin
  74. Logout after clicking URL link results in “headers already sent” error
  75. wpdb->get_var always returning 0
  76. A function that will remove HTML and tags from a string?
  77. $wpdb->prepare is not working like mysql_real_escape_string
  78. Enqueue ONLY Plugin Styles and Scripts
  79. Setting a post’s category
  80. Remove Products From Category
  81. Using WordPress with WP Statistics for QR code usage survey
  82. Integrating a Gutenberg custom block within a larger plugin
  83. How to do admin ajax request in a plugin for rest api
  84. Add default value from selection
  85. How can I create a wp plugin with this code
  86. admin-post.php form handling only working when logged in as admin
  87. Gutenberg component in a plugin admin
  88. Custom Admin Plugin – Injecting repeatable select fields (add, remove) into an Ordered List
  89. Add_action not calling callback function
  90. React in plugins: REST endpoints vs. regular functions
  91. WordPress function is not called and ajax return 0
  92. Post Pagination does not working on WP-Query
  93. Plugin options page: grouping checkboxes
  94. Issue on Getting WP Gallery Items In cpt-single.php As Attachments
  95. Plugin translation not being displayed
  96. Show Metabox Images in slideshow instead of static
  97. Deactivate plugin on registration
  98. How to filter manage categories listing
  99. How to remove a class [closed]
  100. I want to redirect user to an amazon product page from my wordpress website when they add product to there cart [closed]