[git] Add diff-so-fancy as git diff

Added package diff-so-fancy and make diff use it by default for its
diffs by setting it as its diff-pager.

Added sanity function dsf which invokes diff-so-fancy if it exists or
degrades gracefully if it does not. Use this function for all git diff
needs.

Pre-fill the pager search term in git to enable jumping between changed
files with n/N.

bootstrap/packages.txt

@@ -15,6 +15,7 @@ bison
 chromium
 dhcpcd
 dialog
+diff-so-fancy
 docker
 docx2txt
 dunst

git/.config/git/config

@@ -22,6 +22,8 @@
 	rebase        = true # always rebase on pulling, obviates merge commits
 [diff]
 	colorMoved    = zebra # also color stuff that has simply been moved, in a classy zebra-color
+[pager]
+  diff          = dsf | less --tabs=4 -RFXS --pattern '(^(Date|added|deleted|modified): |^diff --git )'
 [color.diff]
   meta          = "9"
   frag          = "magenta bold"

git/.local/bin/dsf

@@ -0,0 +1,18 @@
+#!/usr/bin/env sh
+# Pretty git diff display
+
+# degrade diffs gracefully:
+# prefer diff-so-fancy if it is installed,
+# otherwise fallback to git's own prettifier,
+# if nothing exists just pass it on
+dsf() {
+  if exist diff-so-fancy; then
+    diff-so-fancy
+  elif exist /usr/share/git/diff-highlight/diff-highlight; then
+    /usr/share/git/diff-highlight/diff-highlight
+  else
+    cat
+  fi
+}
+
+dsf

git/README.md

@@ -9,6 +9,16 @@
 ## Global git settings
 
 This is probably the first thing that needs to be customized, since it points to a different identity for each git user.
+I sign all my commits by default, so take out the corresponding lines if you don't, or exchange it with your gpg key.
+
+Git will rewrite any remotes using http(s) to use the ssh notation for pushes to github and gitlab so that, even if you set up the repository using an https url you can utilize your usual ssh key for pushing.
+
+Finally, the configuration makes use of a custom pager called `dsf` which is also contained in this module. 
+It tries to use `diff-so-fancy` if that is installed on the path, otherwise uses git's internal diff prettifier. 
+If nothing exists it falls back to the standard output.
+You can move between changed files in diffs with n/N.
+
+Otherwise, the git config is prepared to handle lfs repositories, and it has an assortment of smaller quality of life changes, though nothing major.
 
 ## Basic git command aliases