kiss: y/n prompts and view package build file feature

kiss

@@ -39,14 +39,26 @@ contains() {
     case " $1 " in *" $2 "*) return 0; esac; return 1
 }
 
-prompt() {
-    # Ask the user for some input.
-    log "Continue?: Press Enter to continue or Ctrl+C to abort here"
+yn() {
+    log "${1:-Continue?} (y/n)"
 
-    # POSIX 'read' has none of the "nice" options like '-n', '-p'
-    # etc etc. This is the most basic usage of 'read'.
-    # '_' is used as 'dash' errors when no variable is given to 'read'.
-    read -r _
+    # Enable raw input to allow for a single byte to be read from
+    # stdin without needing to wait for the user to press Return.
+    stty -icanon -echo
+
+    # Read a single byte from stdin using 'dd'. POSIX 'read' has
+    # no support for single/'N' byte based input from the user.
+    answer=$(dd ibs=1 count=1 2>/dev/null)
+
+    # Disable raw input, leaving the terminal how we *should*
+    # have found it.
+    stty icanon echo
+
+    # Handle the answer here directly, enabling this function's
+    # return status to be used in place of checking for '[yY]'
+    # throughout this program. Also call the function again if
+    # invalid input is given.
+    case $answer in y) ;; n) return 1 ;; *) yn "$1"; esac
 }
 
 as_root() {
@@ -526,7 +538,7 @@ pkg_build() {
     log "Building: $*"
 
     # Only ask for confirmation if more than one package needs to be built.
-    [ $# -gt 1 ] || [ "$pkg_update" ] && prompt
+    [ $# -gt 1 ] || [ "$pkg_update" ] && yn
 
     log "Checking to see if any dependencies have already been built"
     log "Installing any pre-built dependencies"
@@ -560,6 +572,13 @@ pkg_build() {
 
     pkg_verify "$@"
 
+    # Allow user to inspect package files prior to build.
+    [ "$KISS_AUDIT" != 1 ] ||
+        for pkg; do
+            yn "View build file for $pkg?" &&
+                "${EDITOR:-vi}" "$(pkg_find "$pkg")/build"
+        done
+
     # Finally build and create tarballs for all passed packages and
     # dependencies.
     for pkg; do
@@ -643,13 +662,9 @@ pkg_build() {
     set -- $explicit
 
     # Only ask for confirmation if more than one package needs to be installed.
-    [ $# -gt 1 ] && {
-        log "Install built packages? [$*]"
-
-        prompt && {
-            args i "$@"
-            return
-        }
+    [ $# -gt 1 ] && yn "Install built packages? [$*]" && {
+        args i "$@"
+        return
     }
 
     log "Run 'kiss i $*' to install the package(s)"
@@ -730,8 +745,8 @@ pkg_conflicts() {
     # Enable alternatives automatically if it is safe to do so.
     # This checks to see that the package that is about to be installed
     # doesn't overwrite anything it shouldn't in '/var/db/kiss/installed'.
-    "$grep" -Fxf "$cac_dir/$pid-m" -- "$@" | 
-    "$grep" -q ":/var/db/kiss/installed/" || choice_auto=1 
+    "$grep" -Fxf "$cac_dir/$pid-m" -- "$@" |
+    "$grep" -q ":/var/db/kiss/installed/" || choice_auto=1
 
     # Use 'grep' to list matching lines between the to
     # be installed package's manifest and the above filtered
@@ -1146,7 +1161,7 @@ pkg_updates() {
         log "Detected package manager update"
         log "The package manager will be updated first"
 
-        prompt
+        yn
 
         pkg_build kiss
         args i kiss