feat(zsh): add fzf scripts

site-modules/core/files/oh-my-zsh/custom/fzf.zsh

@@ -0,0 +1,50 @@
+#!/bin/zsh
+#
+# FZF scripts to help with various tasks
+#
+# Author:  Ade Attwood <code@adeattwood.co.uk>
+# Updated: 2020-12-28
+#
+
+#
+# Edit commands with file previews using `fd` to search files to exclude files
+# to improve performance
+#
+alias fe="e \$(FZF_DEFAULT_COMMAND=\"fd -t f\" fzf --layout=reverse --preview 'bat --style=numbers ---color=always {}')"
+alias fte="te \$(FZF_DEFAULT_COMMAND=\"fd -t f\" fzf --layout=reverse --preview 'bat --style=numbers ---color=always {}')"
+
+#
+# Searching the git history with diff and show preview support. When selecting a
+# commit `git show` output is displayed and `CTRL-d` the `git diff` output is
+# displayed
+#
+fshow() {
+    local out shas sha q k
+    while out=$(
+            git log --color=always \
+                --format="%C(auto)%h%d %s %C(black)%C(bold)%cr" "$@" |
+                fzf --ansi --multi --no-sort --reverse --query="$q" \
+                    --print-query --expect=ctrl-d --toggle-sort=\`); do
+        q=$(head -1 <<< "$out")
+        k=$(head -2 <<< "$out" | tail -1)
+        shas=$(sed '1,2d;s/^[^a-z0-9]*//;/^$/d' <<< "$out" | awk '{print $1}')
+        [ -z "$shas" ] && continue
+        if [ "$k" = ctrl-d ]; then
+            git diff --color=always $shas | less -R
+        else
+            for sha in $shas; do
+                git show --color=always $sha | less -R
+            done
+        fi
+    done
+}
+
+#
+# Interactive `git add` with FZF and diff preview support.
+#
+fadd() {
+    git add $(git -c color.status=always status --short |
+                  fzf -m --reverse --ansi --multi --ansi --nth 2..,.. \
+                      --preview '(git diff --color=always -- {-1} | sed 1,4d; cat {-1}) | head -500' |
+                  cut -c4- | sed 's/.* -> //')
+}