Add git aliases for signing commits (#1126)

modules/git/README.md

@@ -59,12 +59,16 @@ Aliases are enabled by default. You can disable them with:
   - `gc` records changes to the repository.
   - `gca` stages all modified and deleted files.
   - `gcm` records changes to the repository with the given message.
+  - `gcS` records changes to the repository. (Signed)
+  - `gcSa` stages all modified and deleted files. (Signed)
+  - `gcSm` records changes to the repository with the given message. (Signed)  - `gco`  checks out a branch or paths to work tree.
   - `gcam` stages all modified and deleted files, and records changes to the repository with the given message.
   - `gco` checks out a branch or paths to work tree.
   - `gcO` checks out hunks from the index or the tree interactively.
-  - `gcf` amends the tip of the current branch using the same log message as
+  - `gcf` amends the tip of the current branch using the same log message as *HEAD*. 
-    *HEAD*.
+  - `gcSf` amends the tip of the current branch using the same log message as *HEAD*. (Signed)
   - `gcF` amends the tip of the current branch.
+  - `gcSF` amends the tip of the current branch. (Signed)
   - `gcp` applies changes introduced by existing commits.
   - `gcP` applies changes introduced by existing commits without committing.
   - `gcr` reverts existing commits by reverting patches and recording new

modules/git/alias.zsh

@@ -53,11 +53,16 @@ if ! zstyle -t ':prezto:module:git:alias' skip 'yes'; then
   alias gc='git commit --verbose'
   alias gca='git commit --verbose --all'
   alias gcm='git commit --message'
+  alias gcS='git commit -S --verbose'
+  alias gcSa='git commit -S --verbose --all'
+  alias gcSm='git commit -S --message'
   alias gcam='git commit --all --message'
   alias gco='git checkout'
   alias gcO='git checkout --patch'
   alias gcf='git commit --amend --reuse-message HEAD'
+  alias gcSf='git commit -S --amend --reuse-message HEAD'
   alias gcF='git commit --verbose --amend'
+  alias gcSF='git commit -S --verbose --amend'
   alias gcp='git cherry-pick --ff'
   alias gcP='git cherry-pick --no-commit'
   alias gcr='git revert'