Question: What author wrote a novel that spawned a film of the same and was featured in the memoir 100 Films and a Funeral?

Context paragraphs:
100 Films and a Funeral: 100 Films and a Funeral is both a memoir by Michael Kuhn and a 2007 documentary film adaptation by filmmaker Michael McNamara about the rise and fall of PolyGram Filmed Entertainment (PFE), the company that produced "Four Weddings and a Funeral", "The Usual Suspects", and "Trainspotting".  Kuhn headed PFE from 1991 till 1999, when Philips sold it to the Seagram conglomerate.  The selling of PFE also ended the prominent role of the company in the British film industry revival of the 1990s.

A Conspiracy of Friends: A Conspiracy of Friends is the third online novel by Alexander McCall Smith, author of the The No. 1 Ladies' Detective Agency series.  In the first series, the author wrote a chapter a day, starting from 15 September 2008, and the series ran for 20 weeks, totalling 100 episodes.  The daily chapters, read by Andrew Sachs, were also available as an audio download.

The Dog Who Came in from the Cold: The Dog Who Came in from the Cold is the second online novel by Alexander McCall Smith, author of the The No. 1 Ladies' Detective Agency series.  In the first series, the author wrote a chapter a day, starting on 15 Sep 2008, the series running for 20 weeks and totalling 100 episodes.  The daily chapters, read by Andrew Sachs were also available as an audio download.

A Genius in the Family (book): A Genius in the Family is a memoir by Piers and Hilary du Pré, which chronicles the life and career of their late sister, cellist Jacqueline du Pré.  The book claims to tell the true story of their family lives, and each chapter is headed 'Piers' or 'Hilary', according to which author wrote it.

Sin Pit: Sin Pit is a crime novel by American journalist Paul S. Meskil (Jul 2, 1923–Oct 11, 2005), published by Lion Books in 1954.  It is one of those rare paperback originals that has achieved cult status through a combination of circumstances, including the fact the author wrote only one work of crime fiction, the initial print run was relatively low for paperbacks at the time, the book had only one print run by the original publisher (Lion Books) and, finally, found an audience years later among collectors of 1950s paperback crime novels.  Sin Pit shares all the above circumstances with another paperback crime novel published a year earlier, in 1953, that similarly achieved cult status — Black Wings Has My Angel by Elliott Chaze, published by Fawcett Gold Medal.  Both authors were respected journalists their entire lives and wrote only a single crime novel that was never republished until years later, only after gaining an audience among aficionados of pulp fiction.

Miracles from Heaven: Miracles from Heaven: A Little Girl, Her Journey to Heaven, and Her Amazing Story of Healing is a memoir written by an American author Christy Beam, released on April 14, 2015.  The author wrote the book about her own sick daughter Annabel Beam.

Corduroy Mansions: Corduroy Mansions is the first online novel by Alexander McCall Smith, author of the The No. 1 Ladies' Detective Agency series.  In the first series, the author wrote a chapter a day, starting on 15 Sep 2008, the series running for 20 weeks and totalling 100 episodes.  The daily chapters, read by Andrew Sachs were also available as an audio download.

The New Centurions (novel): The New Centurions, written by Joseph Wambaugh, is a 1971 novel depicting the stresses of police work in Los Angeles, California in the early 1960s.  The author wrote the novel, his first, while a working member of the Los Angeles Police Department.  The novel became a film starring George C. Scott and Stacy Keach.

Bottom's Dream: Bottom's Dream (German: "Zettels Traum" or "ZETTEL’S TRAUM" as the author wrote the title) is a novel published in 1970 by West German author Arno Schmidt.  Schmidt began writing the novel in December 1963 while he and Hans Wollschläger began to translate the works of Edgar Allan Poe into German.  The novel was inspired by James Joyce's novel "Finnegans Wake", particularly Schmidt's use of columns (his "SpaltenTechnik"), which Schmidt claimed was borrowed from the "Wake".

Trainspotting (film): Trainspotting is a 1996 British black comedy crime film directed by Danny Boyle, and starring Ewan McGregor, Ewen Bremner, Jonny Lee Miller, Kevin McKidd, Robert Carlyle, and Kelly Macdonald in her acting debut.  Based on the novel of the same name by Irvine Welsh, the film was released in the United Kingdom on 23 February 1996.

Supporting paragraphs: 100 Films and a Funeral Trainspotting (film)
Answer: Irvine Welsh