fix: prepare-commit-msg script fails when cannot find git mob

fix: GH-141

features/git-mob/mob-init.feature

@@ -21,14 +21,6 @@ Feature: mob-init
     Then the file ".git/hooks/prepare-commit-msg" should exist
     And the file ".git/hooks/prepare-commit-msg" should contain:
       """
-      #!/bin/sh
-
-      COMMIT_MSG_FILE=$1
-      COMMIT_SOURCE=$2
-      SHA1=$3
-
-      set -e
-
       git mob hooks prepare-commit-msg "$COMMIT_MSG_FILE" $COMMIT_SOURCE $SHA1
       """
     And the output should contain:

features/git-mob/uninstall.feature

@@ -50,7 +50,7 @@ Feature: uninstall
     And a file named "local_bin/git-solo" should not exist
     And a file named "local_bin/git-suggest-coauthors" should not exist
 
-  Scenario: uninstall can break hook scripts
+  Scenario: uninstall no longer breaks hook scripts
 
     `git mob` doesn't track the initialization of hook scripts
     so it doesn't know what hook scripts to remove when it
@@ -60,18 +60,15 @@ Feature: uninstall
     check your `.git/hooks/prepare-commit-msg` hook script
     and remove or comment out references to `git mob`
 
-    :warning: if you have `git-mob` in your path when you run
-              this scenario it may fail as it expects to find
-              no `git-mob` instance after running `uninstall`
+    :information_source: this bug was fixed in GH-141 by updating
+                         the prepare-commit-msg script to fail
+                         silently if it cannot find the git mob
+                         plugin
 
     Given a simple git repo at "example"
     And I cd to "example"
     And I successfully run `git mob init`
     And I successfully run `git commit --allow-empty -m "empty mobbed commit"`
     When I successfully run `git mob uninstall`
     And I run `git commit --allow-empty -m "empty mobbed commit"`
-    Then the exit status should be 1
-    And the output should contain:
-      """
-      git: 'mob' is not a git command. See 'git --help'.
-      """
+    Then the exit status should be 0

internal/cmd/mob_init.go

@@ -72,7 +72,7 @@ SHA1=$3
 
 set -e
 
-git mob hooks prepare-commit-msg "$COMMIT_MSG_FILE" $COMMIT_SOURCE $SHA1
+if [ -z "$(which git-mob)" ]; then echo "WARNING: could not locate 'git-mob'; commits will not be prepared"; else git mob hooks prepare-commit-msg "$COMMIT_MSG_FILE" $COMMIT_SOURCE $SHA1; fi
 `
 	if err := os.WriteFile(fileName, []byte(fileContents), 0755); err != nil {
 		return fmt.Errorf("writing git hook: %v", err)