Add useful messages when command line preprocessor fails #1526
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Error messages before and after the changes
Before
2021-05-05 18:48:39 [INFO] (mdbook::book): Book building has started
thread 'main' panicked at 'nn', src/main.rs:53:5
note: run with
RUST_BACKTRACE=1environment variable to display a backtrace2021-05-05 18:48:39 [ERROR] (mdbook::utils): Error: The preprocessor exited unsuccessfully
2021-05-05 18:50:53 [INFO] (mdbook::book): Book building has started
2021-05-05 18:50:53 [ERROR] (mdbook::utils): Error: Unable to parse the preprocessed book
2021-05-05 18:50:53 [ERROR] (mdbook::utils): Caused By: expected value at line 1 column 1
After
2021-05-08 12:44:54 [INFO] (mdbook::book): Book building has started
thread 'main' panicked at 'ddd', src/main.rs:50:5
note: run with
RUST_BACKTRACE=1environment variable to display a backtrace2021-05-08 12:44:54 [ERROR] (mdbook::utils): Error: The "cat" preprocessor exited unsuccessfully with exit code: 101 status
2021-05-05 18:53:36 [INFO] (mdbook::book): Book building has started
2021-05-05 18:53:36 [ERROR] (mdbook::utils): Error: Unable to parse the preprocessed book from "cat" processor
2021-05-05 18:53:36 [ERROR] (mdbook::utils): Caused By: expected value at line 1 column 1