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feat(images): expose rewriter system prompt as admin setting

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CEO feedback: every generated image is anchoring on the cartoon
peptide-with-arms-and-legs character because the hardcoded rewriter
system prompt both lists "anthropomorphized molecules" first in its
primer and ships a few-shot example that literally shows one. The ask
is to give CEO the lever without a code change.

Adds `prautoblogger_image_prompt_instructions` (textarea) in the
Images section. Default value is the existing REWRITER_SYSTEM_PROMPT
constant verbatim, so behaviour is unchanged on upgrade until someone
edits it. `Image_Prompt_Builder::rewrite_via_llm()` reads the option
at call time via a new `resolve_system_prompt()` helper and falls back
to the constant if the option is blank or whitespace-only, so a saved
empty value cannot brick image generation.

Const visibility flipped from `private` to `public` so the settings
field can reference it directly as the field default.

Tests:

- `test_rewrite_uses_setting_when_present` — option set, assert the
  LLM's system message equals the option content.
- `test_rewrite_falls_back_to_default_when_setting_empty` — option
  whitespace, assert the LLM's system message equals the constant.

Uninstall: new option covered by the existing prautoblogger_% LIKE
sweep in uninstall.php.

Cost impact: none by default. Future CEO edits will change prompt
length; current default is ~180 tokens, budget impact linear from
there.

Part of the v0.8.0 image bundle (thread image-mime-bug, message 03).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
peptiderepo
2026-04-21 01:11:15 +07:00
parent fb1451c4dc
commit 0505e50e85
3 changed files with 140 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
includes/admin/class-settings-fields-extended.php
View File

@@ -256,6 +256,14 @@ class PRAutoBlogger_Settings_Fields_Extended {
'default' => PRAUTOBLOGGER_DEFAULT_IMAGE_STYLE_SUFFIX,
'description' => __( 'Appended to every image prompt. Controls visual look. Changing mid-run causes visible style drift.', 'prautoblogger' ),
],
[
'id' => 'prautoblogger_image_prompt_instructions',
'label' => __( 'Image Prompt Instructions', 'prautoblogger' ),
'type' => 'textarea',
'section' => 'prautoblogger_images',
'default' => PRAutoBlogger_Image_Prompt_Builder::REWRITER_SYSTEM_PROMPT,
'description' => __( 'System prompt given to the rewriter LLM that turns each article into a SCENE + CAPTION for the image generator. Changing this reshapes the look of all future images. Leave blank to use the default.', 'prautoblogger' ),
],
[
'id' => 'prautoblogger_image_nsfw_retry',
'label' => __( 'Retry NSFW-Blocked Images', 'prautoblogger' ),

30
includes/core/class-image-prompt-builder.php
View File

@@ -21,13 +21,12 @@ declare(strict_types=1);
class PRAutoBlogger_Image_Prompt_Builder {
/**
* System prompt that teaches the LLM how to write image-gen prompts.
*
* Why this lives here instead of in wp_options: it's engineering-level
* instruction, not a user-facing setting. Changing it should require a
* code review, not an admin-panel click.
* Default system prompt that teaches the LLM how to write image-gen
* prompts. Exposed as a `public const` so the admin-settings layer can
* use it as the default value for `prautoblogger_image_prompt_instructions`.
* The option, when non-empty, wins at call time (see rewrite_via_llm).
*/
private const REWRITER_SYSTEM_PROMPT = <<<'PROMPT'
public const REWRITER_SYSTEM_PROMPT = <<<'PROMPT'
You are a comedy writer and single-panel cartoon creator, like Gary Larson (The Far Side) meets science humor.
Given an article title and summary about peptides, supplements, or biohacking, create a SINGLE-PANEL COMIC concept. Output TWO parts separated by a blank line:
@@ -141,12 +140,13 @@ PROMPT;
}
try {
$llm = $this->get_llm_provider();
$model = get_option( 'prautoblogger_analysis_model', PRAUTOBLOGGER_DEFAULT_ANALYSIS_MODEL );
$llm = $this->get_llm_provider();
$model = get_option( 'prautoblogger_analysis_model', PRAUTOBLOGGER_DEFAULT_ANALYSIS_MODEL );
$system = $this->resolve_system_prompt();
$result = $llm->send_chat_completion(
[
[ 'role' => 'system', 'content' => self::REWRITER_SYSTEM_PROMPT ],
[ 'role' => 'system', 'content' => $system ],
[ 'role' => 'user', 'content' => $user_message ],
],
$model,
@@ -283,15 +283,17 @@ PROMPT;
];
}
/**
* Lazy-load the OpenRouter provider.
*
* @return PRAutoBlogger_OpenRouter_Provider
*/
/** Lazy-load the OpenRouter provider. */
private function get_llm_provider(): PRAutoBlogger_OpenRouter_Provider {
if ( null === $this->llm ) {
$this->llm = new PRAutoBlogger_OpenRouter_Provider();
}
return $this->llm;
}
/** Admin option wins; blank falls back to REWRITER_SYSTEM_PROMPT. */
private function resolve_system_prompt(): string {
$override = (string) get_option( 'prautoblogger_image_prompt_instructions', '' );
return '' !== trim( $override ) ? $override : self::REWRITER_SYSTEM_PROMPT;
}
}