Add `pre-commit` checks

The big ones here are `trim-trailing-whitespace` and `end-of-file-fixer`
(which makes sure that every file ends with exactly one newline
character).

Change-Id: Idca73b640883188f068f9903e013cf0d82aa1123

7 files changed, 0 insertions, 7 deletions

diff --git a/doc/manual/src/command-ref/nix-env/install.md b/doc/manual/src/command-ref/nix-env/install.md
index 5dc04c385..5c532b856 100644
--- a/doc/manual/src/command-ref/nix-env/install.md
+++ b/doc/manual/src/command-ref/nix-env/install.md
@@ -184,4 +184,3 @@ channel:
 ```console
 $ nix-env --file https://github.com/NixOS/nixpkgs/archive/nixos-14.12.tar.gz --install --attr firefox
 ```
-
diff --git a/doc/manual/src/command-ref/nix-env/list-generations.md b/doc/manual/src/command-ref/nix-env/list-generations.md
index a4881ece8..ab04122cf 100644
--- a/doc/manual/src/command-ref/nix-env/list-generations.md
+++ b/doc/manual/src/command-ref/nix-env/list-generations.md
@@ -30,4 +30,3 @@ $ nix-env --list-generations
   97   2004-02-06 16:22:45
   98   2004-02-06 16:24:33   (current)
 ```
-
diff --git a/doc/manual/src/command-ref/nix-env/query.md b/doc/manual/src/command-ref/nix-env/query.md
index c9b4d8513..3fbb30839 100644
--- a/doc/manual/src/command-ref/nix-env/query.md
+++ b/doc/manual/src/command-ref/nix-env/query.md
@@ -212,4 +212,3 @@ To show all packages in the latest revision of the Nixpkgs repository:
 ```console
 $ nix-env --file https://github.com/NixOS/nixpkgs/archive/master.tar.gz --query --available
 ```
-
diff --git a/doc/manual/src/command-ref/nix-env/set-flag.md b/doc/manual/src/command-ref/nix-env/set-flag.md
index e04b22a91..68a88d288 100644
--- a/doc/manual/src/command-ref/nix-env/set-flag.md
+++ b/doc/manual/src/command-ref/nix-env/set-flag.md
@@ -79,4 +79,3 @@ To make files from `binutils` take precedence over files from `gcc`:
 $ nix-env --set-flag priority 5 binutils
 $ nix-env --set-flag priority 10 gcc
 ```
-
diff --git a/doc/manual/src/command-ref/nix-env/set.md b/doc/manual/src/command-ref/nix-env/set.md
index b9950eeab..dc2765217 100644
--- a/doc/manual/src/command-ref/nix-env/set.md
+++ b/doc/manual/src/command-ref/nix-env/set.md
@@ -27,4 +27,3 @@ contain just Firefox:
 ```console
 $ nix-env --profile /nix/var/nix/profiles/browser --set firefox
 ```
-
diff --git a/doc/manual/src/command-ref/nix-env/switch-generation.md b/doc/manual/src/command-ref/nix-env/switch-generation.md
index 38cf0534d..d211c5f85 100644
--- a/doc/manual/src/command-ref/nix-env/switch-generation.md
+++ b/doc/manual/src/command-ref/nix-env/switch-generation.md
@@ -30,4 +30,3 @@ Switching will fail if the specified generation does not exist.
 $ nix-env --switch-generation 42
 switching from generation 50 to 42
 ```
-
diff --git a/doc/manual/src/command-ref/nix-env/upgrade.md b/doc/manual/src/command-ref/nix-env/upgrade.md
index 322dfbda2..11e0eddbe 100644
--- a/doc/manual/src/command-ref/nix-env/upgrade.md
+++ b/doc/manual/src/command-ref/nix-env/upgrade.md
@@ -138,4 +138,3 @@ This is illustrated by the following examples:
     2.3a < 2.3c
     2.3pre1 < 2.3c
     2.3pre1 < 2.3q
-