git: Add git-bug edit function gbe

Can edit either the description of a bug (`gbe <bug-id>`) or a specific
comment (`gbe <comment-id>`).

vcs/git/config/sh/alias.d/git-bug.sh

@@ -0,0 +1,66 @@
+#!/usr/bin/env sh
+
+if ! exist git-bug; then
+    return 1
+fi
+
+# POSIX-compliant version of . <(cmd) substitution
+# shellcheck source=/dev/null # but shellcheck can't access
+git-bug completion zsh | . /dev/fd/0
+
+alias gbt='git-bug termui'
+alias gb="git-bug bug"
+alias gbw="git-bug bug show"
+
+alias gbn='git-bug bug new'
+alias gbm='git-bug bug comment new'
+
+# 'git-bug edit' function to edit:
+#   - bug descriptions (pass a bug-id)
+#   - comments (pass a comment-id)
+if [ -x "$(command -v vipe)" ] && [ -x "$(command -v jq)" ]; then
+    gbe() {
+        if git-bug bug status "$1" >/dev/null 2>/dev/null; then
+            id=$(git-bug bug show --format json "$1" | jq --raw-output '.comments[0].id')
+            msg=$(git-bug bug show --format json "$1" | jq --raw-output '.comments[0].message')
+            chain=$(git-bug bug show "$1" | while read -r line; do echo "# $line"; done)
+
+            txt="$(printf "%s\n\n%s\n# %s" "$msg" "# Please enter the comment message. Lines starting with '#' will be ignored,
+# and an empty message aborts the operation.
+#
+# Bug history:
+#" "$chain")"
+
+            outp=$(printf "%s" "$txt" | vipe | sed '/^#/d')
+            comp=$(printf "%s" "$txt" | sed '/^#/d')
+            if [ -z "$outp" ]; then
+                echo Empty message, nothing to do. >&2
+            elif [ "$comp" = "$outp" ]; then
+                echo No change detected, nothing to do. >&2
+            else
+                git-bug bug comment edit -m "$outp" "$id"
+            fi
+        else
+            # TODO: Populate comment edit msg with old comment just like above
+            # Might need upstream changes to have 'show bug comment' interface
+            # because currently we can't just 'display' a single bug comment
+            # TODO: If git-bug has a bug selected (with git-bug select)
+            # we could use this here
+            git-bug bug comment edit "$@"
+        fi
+    }
+fi
+
+# TODO: edit bug title
+alias gbte='git-bug bug title edit'
+
+# TODO: Implement toggle function
+# grab current status and then open or close accordingly
+alias gbo='git-bug bug status close'
+
+alias gbp='git-bug push'
+alias gbl='git-bug pull'
+
+alias gbu='git-bug user' # list users
+# show primary user info
+alias gbU='git-bug user user "$(git-bug user | cut -d" " -f1 | head -n1)"'

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

@@ -97,29 +97,4 @@ else
     alias gsta='git stash save'
 fi
 
-if exist git-bug; then
-    # POSIX-compliant version of . <(cmd) substitution
-    # shellcheck source=/dev/null # but shellcheck can't access
-    git-bug completion zsh | . /dev/fd/0
-
-    alias gbt='git-bug termui'
-    alias gb="git-bug bug"
-    alias gbw="git-bug bug show"
-
-    alias gbn='git-bug bug new'
-    alias gbm='git-bug bug comment new'
-    alias gbte='git-bug bug title edit'
-
-    # TODO: Implement toggle function
-    # grab current status and then open or close accordingly
-    alias gbo='git-bug bug status close'
-
-    alias gbp='git-bug push'
-    alias gbl='git-bug pull'
-
-    alias gbu='git-bug user' # list users
-    # show primary user info
-    alias gbU='git-bug user user "$(git-bug user | cut -d" " -f1 | head -n1)"'
-fi
-
 unset -v git_version