devscript: all large scripts use die/warn idiom

developer/bin/develop_brew_cask

@@ -7,13 +7,25 @@ set -e               # exit on any uncaught error
 set +o histexpand    # don't expand history expressions
 shopt -s nocasematch # case-insensitive regular expressions
 
+warn () {
+    local message="$@"
+    if ! [[ $message =~ "\n"$ ]]; then
+        message="${message}\n"
+    fi
+    printf "$message" 1>&2
+}
+
+die () {
+    warn "$@"
+    exit 1
+}
+
 cd_to_project_root () {
     local script_dir="$(/usr/bin/dirname $0)"
     cd "$script_dir"
     local git_root="$(git rev-parse --show-toplevel)"
     if [[ -z "$git_root" ]]; then
-        printf "Could not find git project root"
-        exit 1
+        die "Could not find git project root"
     fi
     cd "$git_root"
 }
@@ -22,8 +34,7 @@ cd_to_version_dir () {
     local cellar_dir="$1"
     local version_dir="$2"
     if [[ -z "$version_dir" ]]; then
-        printf "Can't get version dir under $cellar_dir/\n"
-        exit 1
+        die "Can't get version dir under $cellar_dir/"
     fi
     cd "$cellar_dir/$version_dir"
 }
@@ -57,15 +68,13 @@ _develop_brew_cask () {
 
     # sanity check
     if [[ "$(/usr/bin/stat -L -f '%i' "$tap_dir")" -eq "$(/usr/bin/stat -L -f '%i' "$git_root")" ]]; then
-        printf "\nERROR: run this script in your private repo, not inside Homebrew.\n"
-        exit 1
+        die "\nERROR: run this script in your private repo, not inside Homebrew."
     fi
 
     # action
     cd_to_version_dir "$cellar_dir" "$version_dir"
     if [[ -e "production_rubylib" ]]; then
-        printf "brew-cask is already set up for development\n"
-        exit 1
+        die "brew-cask is already set up for development"
     else
         create_dev_links "$git_root" "$tap_dir"
         printf "brew-cask is now in development mode\n"

developer/bin/get_release_tag

@@ -11,12 +11,16 @@ opt_next=''
 opt_latest=''
 opt_verbose=''
 
-die () {
+warn () {
     local message="$@"
     if ! [[ $message =~ "\n"$ ]]; then
         message="${message}\n"
     fi
     printf "$message" 1>&2
+}
+
+die () {
+    warn "$@"
     exit 1
 }
 

developer/bin/production_brew_cask

@@ -7,13 +7,25 @@ set -e               # exit on any uncaught error
 set +o histexpand    # don't expand history expressions
 shopt -s nocasematch # case-insensitive regular expressions
 
+warn () {
+    local message="$@"
+    if ! [[ $message =~ "\n"$ ]]; then
+        message="${message}\n"
+    fi
+    printf "$message" 1>&2
+}
+
+die () {
+    warn "$@"
+    exit 1
+}
+
 cd_to_project_root () {
     local script_dir="$(/usr/bin/dirname $0)"
     cd "$script_dir"
     local git_root="$(git rev-parse --show-toplevel)"
     if [[ -z "$git_root" ]]; then
-        printf "Could not find git project root"
-        exit 1
+        die "Could not find git project root"
     fi
     cd "$git_root"
 }
@@ -22,8 +34,7 @@ cd_to_version_dir () {
     local cellar_dir="$1"
     local version_dir="$2"
     if [[ -z "$version_dir" ]]; then
-        printf "Can't get version dir under $cellar_dir/\n"
-        exit 1
+        die "Can't get version dir under $cellar_dir/"
     fi
     cd "$cellar_dir/$version_dir"
 }
@@ -54,8 +65,7 @@ _production_brew_cask () {
 
     # sanity check
     if [[ "$(/usr/bin/stat -L -f '%i' "$tap_dir")" -eq "$(/usr/bin/stat -L -f '%i' "$git_root")" ]]; then
-        printf "\nERROR: run this script in your private repo, not inside Homebrew.\n"
-        exit 1
+        die "\nERROR: run this script in your private repo, not inside Homebrew."
     fi
 
     # action
@@ -65,8 +75,7 @@ _production_brew_cask () {
         printf "brew-cask is now in production mode\n"
         printf "It is safe to run 'brew update'\n"
     else
-        printf "brew-cask is already set up for production\n"
-        exit 1
+        die "brew-cask is already set up for production"
     fi
 
 }

developer/bin/project_stats

@@ -9,13 +9,25 @@ set -e               # exit on any uncaught error
 set +o histexpand    # don't expand history expressions
 shopt -s nocasematch # case-insensitive regular expressions
 
+warn () {
+    local message="$@"
+    if ! [[ $message =~ "\n"$ ]]; then
+        message="${message}\n"
+    fi
+    printf "$message" 1>&2
+}
+
+die () {
+    warn "$@"
+    exit 1
+}
+
 cd_to_project_root () {
     local script_dir="$(/usr/bin/dirname $0)"
     cd "$script_dir"
     local git_root="$(git rev-parse --show-toplevel)"
     if [[ -z "$git_root" ]]; then
-        printf "Could not find git project root"
-        exit 1
+        die "Could not find git project root"
     fi
     cd "$git_root"
 }
@@ -27,14 +39,13 @@ warn_if_off_branch () {
         wanted_branch="$1"
     fi
     if ! [[ "$branch" = "$wanted_branch" ]]; then
-        printf "\nWARNING: you are running from branch '$branch', not '$wanted_branch'\n\n"
+        warn "\nWARNING: you are running from branch '$branch', not '$wanted_branch'\n\n"
     fi
 }
 
 verify_git_object () {
     if ! git rev-parse --verify "$1" > /dev/null 2>/dev/null; then
-        printf "\nERROR: No such commit object: $1\n\n"
-        exit 1
+        die "\nERROR: No such commit object: $1"
     fi
 }