Reapply "Add blerc."

This reverts commit b2734d8e54.

.blerc

@@ -0,0 +1,54 @@
+# Insert date-time string within a bash prompt using `\dt<SP>`
+function blerc/define-sabbrev-dt {
+  ble-sabbrev -m '\dt'='ble/util/assign COMPREPLY "date +%F_%H-%M-%S"'
+}
+blehook/eval-after-load complete blerc/define-sabbrev-dt
+
+# Insert the time within a bash prompt using `\time<SP>`
+function blerc/define-sabbrev-time {
+  ble-sabbrev -m '\time'='ble/util/assign COMPREPLY "date +%H-%M-%S"'
+}
+blehook/eval-after-load complete blerc/define-sabbrev-time
+
+# Insert the date within a bash prompt using `\date<SP>`
+# https://github.com/akinomyoga/ble.sh/wiki/Recipes#r1-insert-date-through-sabbrev-date
+function blerc/define-sabbrev-date {
+  ble-sabbrev -m '\date'='ble/util/assign COMPREPLY "date +%F"'
+}
+blehook/eval-after-load complete blerc/define-sabbrev-date
+
+# Interactive git branch selection with `\branch<SP>`
+# https://github.com/akinomyoga/ble.sh/wiki/Recipes#r2-insert-git-branch-name-from-menu-through-sabbrev-branch
+function blerc/define-sabbrev-branch {
+  function blerc/sabbrev-git-branch {
+    ble/util/assign-array COMPREPLY "git branch | sed 's/^\*\{0,1\}[[:blank:]]*//'" 2>/dev/null
+  }
+  ble-sabbrev -m '\branch'=blerc/sabbrev-git-branch
+}
+blehook/eval-after-load complete blerc/define-sabbrev-branch
+
+# Interactive git commit selection with `\commit<SP>`
+# https://github.com/akinomyoga/ble.sh/wiki/Recipes#r3-insert-git-commit-id-from-menu-through-sabbrev-commit
+function blerc/define-sabbrev-commit {
+  ble/color/defface blerc_git_commit_id fg=63
+  ble/complete/action#inherit-from blerc_git_commit_id word
+  function ble/complete/action:blerc_git_commit_id/init-menu-item {
+    local ret
+    ble/color/face2g blerc_git_commit_id; g=$ret
+  }
+  function blerc/sabbrev-git-commit {
+    bleopt sabbrev_menu_style=desc-raw
+    bleopt sabbrev_menu_opts=enter_menu
+
+    local format=$'%h \e[1;32m(%ar)\e[m %s - \e[4m%an\e[m\e[1;33m%d\e[m'
+    local arr; ble/util/assign-array arr 'git log --pretty=format:"$format"' &>/dev/null
+    local line hash subject
+    for line in "${arr[@]}"; do
+      builtin read hash subject <<< "$line"
+      ble/complete/cand/yield blerc_git_commit_id "$hash" "$subject"
+    done
+  }
+  ble-sabbrev -m '\commit'='blerc/sabbrev-git-commit'
+}
+blehook/eval-after-load complete blerc/define-sabbrev-commit
+