Add functionality to truncate via `composer.json`

README.md

@@ -312,7 +312,7 @@ Customizations available are:
 |Default|Truncate whole directories from left. How many is defined by `POWERLEVEL9K_SHORTEN_DIR_LENGTH`|
 |`truncate_middle`|Truncates the middle part of a folder. E.g. you are in a folder named "~/MySuperProjects/AwesomeFiles/BoringOffice", then it will truncated to "~/MyS..cts/Awe..les/BoringOffice", if `POWERLEVEL9K_SHORTEN_DIR_LENGTH=3` is also set (controls the amount of characters to be left).|
 |`truncate_from_right`|Just leaves the beginning of a folder name untouched. E.g. your folders will be truncated like so: "/ro../Pr../office". How many characters will be untouched is controlled by `POWERLEVEL9K_SHORTEN_DIR_LENGTH`.|
-|`truncate_with_package_name`|Use the `package.json` `name` field to abbreviate the directory path.|
+|`truncate_with_package_name`|Search for a `package.json` or `composer.json` and prints the `name` field to abbreviate the directory path. The precedence and/or files could be set by `POWERLEVEL9K_DIR_PACKAGE_FILES=(package.json composer.json)`|
 |`truncate_with_folder_marker`|Search for a file that is specified by `POWERLEVEL9K_SHORTEN_FOLDER_MARKER` and truncate everything before that (if found, otherwise stop on $HOME and ROOT).|
 
 For example, if you wanted the truncation behavior of the `fish` shell, which

powerlevel9k.zsh-theme

@@ -655,7 +655,16 @@ prompt_dir() {
         subdirectory_path=$(truncatePathFromRight "${current_dir:${#${(S%%)package_path//$~zero/}}}")
         # Parse the 'name' from the package.json; if there are any problems, just
         # print the file path
-        local pkgFile="${package_path}/package.json"
+        defined POWERLEVEL9K_DIR_PACKAGE_FILES || POWERLEVEL9K_DIR_PACKAGE_FILES=(package.json composer.json)
+
+        local pkgFile="unknown"
+        for file in "${POWERLEVEL9K_DIR_PACKAGE_FILES[@]}"; do
+          if [[ -f "${package_path}/${file}" ]]; then
+            pkgFile="${package_path}/${file}"
+            break;
+          fi
+        done
+
         local packageName=$(jq '.name' ${pkgFile} 2> /dev/null \
           || node -e 'console.log(require(process.argv[1]).name);' ${pkgFile} 2>/dev/null \
           || cat "${pkgFile}" 2> /dev/null | grep -m 1 "\"name\"" | awk -F ':' '{print $2}' | awk -F '"' '{print $2}' 2>/dev/null \