colored header help start

nextflow.config

@@ -8,6 +8,8 @@
 // Global Default Parameters
 params{
   version = '0.1.0'
+  // Colored output for log by default
+  monochrome_logs = false
 }
 
 manifest {

pipeline.nf

@@ -12,3 +12,46 @@
  Katherine Eaton <ktmeaton@gmail.com> - https://github.com/ktmeaton>
 ========================================================================================
 */
+
+def helpMessage() {
+    log.info nfcoreHeader()
+    log.info"""
+    =========================================
+    ${workflow.manifest.name} v${workflow.manifest.version}
+    =========================================
+    Usage:
+    The typical command for running the pipeline is as follows:
+    """.stripIndent()
+}
+
+// Show help message
+params.help = false
+if (params.help){
+    helpMessage()
+    exit 0
+}
+
+
+def nfcoreHeader() {
+    // Log colors ANSI codes
+    // Comes from nf-core/rnaseq and nf-core/eager
+    c_reset = params.monochrome_logs ? '' : "\033[0m";
+    c_dim = params.monochrome_logs ? '' : "\033[2m";
+    c_black = params.monochrome_logs ? '' : "\033[0;30m";
+    c_green = params.monochrome_logs ? '' : "\033[0;32m";
+    c_yellow = params.monochrome_logs ? '' : "\033[0;33m";
+    c_blue = params.monochrome_logs ? '' : "\033[0;34m";
+    c_purple = params.monochrome_logs ? '' : "\033[0;35m";
+    c_cyan = params.monochrome_logs ? '' : "\033[0;36m";
+    c_white = params.monochrome_logs ? '' : "\033[0;37m";
+
+    return """    -${c_dim}--------------------------------------------------${c_reset}-
+                                            ${c_green},--.${c_black}/${c_green},-.${c_reset}
+    ${c_blue}        ___     __   __   __   ___     ${c_green}/,-._.--~\'${c_reset}
+    ${c_blue}  |\\ | |__  __ /  ` /  \\ |__) |__         ${c_yellow}}  {${c_reset}
+    ${c_blue}  | \\| |       \\__, \\__/ |  \\ |___     ${c_green}\\`-._,-`-,${c_reset}
+                                            ${c_green}`._,._,\'${c_reset}
+    ${c_purple}  ${workflow.manifest.name} v${workflow.manifest.version}${c_reset}
+    -${c_dim}--------------------------------------------------${c_reset}-
+    """.stripIndent()
+}