git: Add word-wise diff as quick alias

Since I often use git for prose and textual writing, wordwise
diffs make a lot of sense to have quick access to. This commit
sets up a git-internal alias `git diffword` as well as an
even shorter `gdd` (diff) and `gdds` (diff staged) which
mimic the other diff aliases `gd`/`gds` already existing.

git/.config/git/config

@@ -22,6 +22,7 @@
   last          = "diff HEAD~ HEAD"
   pushall       = "!git remote | xargs -I R git push R"   # push to all connected remotes
   fetchall      = "!git remote | xargs -I R git fetch R"  # fetch from all connected remotes
+  diffword      = "!git diff --word-diff=color --word-diff-regex='[0-9A-Za-z_]+'"  # word-wise diff, good for prose
 [commit]
   gpgsign       = true                                                 # sign commits as me
   verbose       = true                                                 # Always show diff when preparing commit message

git/.config/sh/alias.d/git.sh

@@ -32,7 +32,9 @@ fi
 alias gco='git checkout'
 
 alias gd='git diff'
+alias gdd='git diffword'
 alias gds='git diff --staged'
+alias gdds='git diffword --staged'
 
 alias gi='git ignore'