run-source.md
In devtools: Tools to Make Developing R Packages Easier

gist with multiple files uses first with warning

Code
  source_gist("605a984e764f9ed358556b4ce48cbd08", sha1 = "f176f5e1fe0", local = environment())
Message
  2 .R files in gist, using first
  i Sourcing gist "605a984e764f9ed358556b4ce48cbd08"

errors with bad id

Code
  source_gist("xxxx")
Condition
  Error in `source_gist()`:
  ! Invalid gist id specification "xxxx"

error if file doesn't exist or no files

Code
  find_gist("605a984e764f9ed358556b4ce48cbd08", 1)
Condition
  Error:
  ! `filename` must be `NULL`, or a single filename ending in .R/.r
Code
  find_gist("605a984e764f9ed358556b4ce48cbd08", "c.r")
Condition
  Error:
  ! 'c.r' not found in gist
Code
  find_gist("c535eee2d02e5f47c8e7642811bc327c")
Condition
  Error:
  ! No R files found in gist

check_sha1() checks or reports sha1 as needed

Code
  check_sha1(path, NULL)
Message
  i SHA-1 hash of file is "9f7efafc467018e11a7efc4bb7089ff0e5bff371"
Code
  check_sha1(path, "f")
Condition
  Error in `check_sha1()`:
  ! `sha1` must be at least 6 characters, not 1.
Code
  check_sha1(path, "ffffff")
Condition
  Error in `check_sha1()`:
  ! `sha1` ("ffffff") doesn't match SHA-1 hash of downloaded file ("9f7efa")