Question: What writer for The Smothers Brothers Comedy Hour wrote a 2000 novella adapted into a 2005 film?

Context paragraphs:
Shopgirl (novella): Shopgirl is a 2000 novella written by Steve Martin.  Martin adapted his book for a 2005 film of the same title.

Another Nice Mess: Another Nice Mess is a 1972 comedy film written and directed by Bob Einstein, a former writer for "The Smothers Brothers Comedy Hour".  The film starred Rich Little as Richard Nixon and Herb Voland as Spiro Agnew.  The film is presented in the style of a Laurel and Hardy comedy, with Nixon in the Oliver Hardy role, and Agnew in the Stan Laurel role.  The film is out of print and hard to find.  The film also stars Bruce Kirby, Diahn Williams, Stewart Bradley, and Steve Martin in his film debut.

Smothers Brothers Comedy Hour (album): Smothers Brothers Comedy Hour (the first release of this album lists it as "Smothers Comedy Brothers Hour" on the label, similar to the show's logo on the front cover) is a 1968 comedy album released on Mercury Records by the Smothers Brothers consisting of bits from their CBS television series, "The Smothers Brothers Comedy Hour".  As a result, much of the album consists of political humor, which was absent from their previous recording efforts but remained true to their television show's content.  It reached number 164 on the "Billboard" Pop Albums chart.

Steve Martin: Stephen Glenn Martin (born August 14, 1945) is an American actor, comedian, writer, producer, and musician.  Martin came to public notice in the 1960s as a writer for "The Smothers Brothers Comedy Hour", and later as a frequent guest on "The Tonight Show".  In the 1970s, Martin performed his offbeat, absurdist comedy routines before packed houses on national tours.  Since the 1980s, having branched away from comedy, Martin has become a successful actor, as well as an author, playwright, pianist, and banjo player, eventually earning him an Emmy, Grammy, and American Comedy awards, among other honors.

Paul Wayne: Paul Wayne (born 1932 in Toronto, Ontario) is a Canadian writer.  He wrote sketches of television variety shows, like "The Smothers Brothers Comedy Hour" that he won an Emmy Award for, and episodes of other television shows, like "Three's Company".  He also served as producer of only two short-lived sitcoms, "Doc" and "Excuse My French".

Mason Williams: Mason Douglas Williams (born August 24, 1938) is an American classical guitarist, composer, writer, comedian and poet.  He is best known for his 1968 instrumental "Classical Gas" and for his work as a comedy writer on "Smothers Brothers Comedy Hour", "The Glen Campbell Goodtime Hour", and "Saturday Night Live".

The Smothers Brothers at the Purple Onion: The Smothers Brothers at the Purple Onion, released May 1, 1961 on Mercury Records, was the first album released by the Smothers Brothers and established their reputation as folk music satirists.  The Purple Onion was a celebrated comedy and music club in the North Beach area of San Francisco that launched the careers of the Kingston Trio and Phyllis Diller in addition to the Smothers Brothers.  The album's full cover text is: The Songs and Comedy of the Smothers Brothers!  Recorded at the Purple Onion, San Francisco, and is Mercury catalog number MG 20611 (monaural), and SR 60611 (stereo).  It is sometimes referred to as Live at the Purple Onion.

The Glen Campbell Goodtime Hour: The Glen Campbell Goodtime Hour is an American network television music and comedy variety show hosted by singer Glen Campbell from January 1969 through June 1972 on CBS.  He was offered the show after he hosted a 1968 summer replacement for "The Smothers Brothers Comedy Hour".  Campbell used "Gentle on My Mind" as the theme song of the show.  The show was one of the few rural-oriented shows to survive CBS's rural purge of 1971.

The Smothers Brothers Comedy Hour: The Smothers Brothers Comedy Hour was an American comedy and variety show television series hosted by the Smothers Brothers and initially airing on CBS from 1967 to 1969.

Murray Roman: Murray Roman (March 8, 1929 – November 6, 1973) was an American stand-up comedian whose career was cut short by a car crash.  Many consider his style, and material, to be similar to Lenny Bruce.  Roman was also a writer on the Smothers Brothers Comedy Hour and, as part of the Comedy Hour writing team, won an Emmy for his work in 1969.  His most noted sketch was "The Honey House," which mocked the syrupy 1968 hit song "Honey," by Bobby Goldsboro.  The skit featured a tour of house where the eponymous Honey had lived and died, conducted with suitable melodrama by her husband, played first by Tom Smothers and then by Dick.

Supporting paragraphs: Shopgirl (novella) Steve Martin
Answer: Steve Martin