enh(install): Detect suitable branch to download

Author: davidhcefx

install.sh

@@ -1,25 +1,26 @@
-#!/bin/sh
+#!/bin/bash
+set -e
 
 # check for unzip before we continue
 if [ ! "$(command -v unzip)" ]; then
   echo 'unzip is required but was not found. Install unzip first and then run this script again.' >&2
   exit 1
 fi
 
-_fetch_sources(){
-  wget -O /tmp/nanorc.zip https://github.com/galenguyer/nano-syntax-highlighting/archive/master.zip
+_fetch_sources() {
+  br=$(_find_suitable_branch)
   mkdir -p ~/.nano/
+  cd ~/.nano/
 
-  cd ~/.nano/ || exit
+  wget -O "/tmp/nanorc.zip" "https://github.com/galenguyer/nano-syntax-highlighting/archive/${br}.zip"
   unzip -o "/tmp/nanorc.zip"
-  mv nano-syntax-highlighting-master/* ./
-  rm -rf nano-syntax-highlighting-master
-  rm /tmp/nanorc.zip
+  mv "nano-syntax-highlighting-${br}"/* ./
+  rm -rf "nano-syntax-highlighting-${br}"
+  rm -f "/tmp/nanorc.zip"
 }
 
-_update_nanorc(){
+_update_nanorc() {
   touch $NANORC_FILE
-
   # add all includes from ~/.nano/nanorc if they're not already there
   while read -r inc; do
       if ! grep -q "$inc" "${NANORC_FILE}"; then
@@ -28,25 +29,68 @@ _update_nanorc(){
   done < ~/.nano/nanorc
 }
 
-_update_nanorc_lite(){
+_update_nanorc_lite() {
   sed -i '/include "\/usr\/share\/nano\/\*\.nanorc"/i include "~\/.nano\/*.nanorc"' "${NANORC_FILE}"
 }
 
+_version_str_to_num() {
+  if [ -z "$1" ]; then
+    return
+  fi
+  printf "$1" | awk -F . '{printf("%d%02d%02d", $1, $2, $3)}'
+}
+
+_find_suitable_branch() {
+  # find the branch that is suitable for local nano
+  verstr=$(nano --version 2>/dev/null | awk '/GNU nano/ {print ($3=="version")? $4: substr($5,2)}')
+  ver=$(_version_str_to_num "$verstr")
+  if [ -z "$ver" ]; then
+    echo "Cannot determine nano's version, fallback to master" >&2
+    echo "master"
+    return
+  fi
+  branches=(
+    pre-6.0
+    pre-5.0
+    pre-4.5
+    pre-2.9.5
+    pre-2.6.0
+    pre-2.3.3
+    pre-2.1.6
+  )
+  target="master"
+  # find smallest branch that is larger than ver
+  for b in "${branches[@]}"; do
+    num=$(_version_str_to_num "${b#*pre-}")
+    if (( ver < num )); then
+      target="${b}"
+    else
+      break
+    fi
+  done
+  echo "$target"
+}
+
+
 NANORC_FILE=~/.nanorc
 
 case "$1" in
  -l|--lite)
-   UPDATE_LITE=1;;
+   UPDATE_LITE=1
+ ;;
+ --find_suitable_branch)
+  _find_suitable_branch
+  exit 0
+ ;;
  -h|--help)
    echo "Install script for nanorc syntax highlights"
    echo "Call with -l or --lite to update .nanorc with secondary precedence to existing .nanorc includes"
    exit 0
  ;;
 esac
 
-_fetch_sources;
-if [ "$UPDATE_LITE" ];
-then
+_fetch_sources
+if [ "$UPDATE_LITE" ]; then
   _update_nanorc_lite
 else
   _update_nanorc

readme.md

@@ -13,13 +13,13 @@ There are three ways to install this repo.
 Copy the following code to download and run the installer script:
 
 ```sh
-curl https://raw.githubusercontent.com/galenguyer/nano-syntax-highlighting/master/install.sh | sh
+curl https://raw.githubusercontent.com/galenguyer/nano-syntax-highlighting/master/install.sh | bash
 ```
 
 If your machine doesn't have `curl` command, use this code:
 
 ```sh
-wget https://raw.githubusercontent.com/galenguyer/nano-syntax-highlighting/master/install.sh -O- | sh
+wget https://raw.githubusercontent.com/galenguyer/nano-syntax-highlighting/master/install.sh -O- | bash
 ```
 
 This automatically unpacks all the `.nanorc` files to `~/.nano`.

tool/create-branches.sh

@@ -16,7 +16,7 @@ if [ "${BASH_VERSINFO[0]}" -lt 4 ]; then
     exit 1
 fi
 
-# to ensure this list enumerates all created branches
+# NOTE: remember to also sync with install.sh
 declare -A branches=(
     [pre-6.0]=pre-6.0
     [pre-5.0]=pre-5.0

tool/switch-branch.sh

@@ -1,43 +1,9 @@
 #! /usr/bin/env bash
 
-function version_to_num() {
-    if [[ -z "$1" ]]; then
-        return
-    fi
-    awk -F . '{printf("%d%02d%02d", $1, $2, $3)}' <<<"$1"
-}
+base="$(dirname "$0")/../"
+branch=$("$base/install.sh" --find_suitable_branch)
+verstr=$(nano --version 2>/dev/null | awk '/GNU nano/ {print ($3=="version")? $4: substr($5,2)}')
 
-
-NANO_VER=$(version_to_num "$(nano --version 2>/dev/null | awk '/version/ {print $4}')")
-
-if [[ -z "${NANO_VER}" ]]; then
-    printf "Cannot determine nano's version\n" >&2
-    exit 1
-fi
-
-echo "Found nano version ${NANO_VER} ($(nano --version | awk '/version/ {print $4}'))"
-
-# fetch the available "pre*" branches
-git fetch --prune origin
-branches=()
-
-#mapfile -t branches <<<"$(git branch -l -r --format='%(refname:short)' "origin/pre-*")"
-while IFS= read -r line; do
-    branches+=("$line")
-done < <(git for-each-ref --format='%(refname:short)' 'refs/remotes/origin/pre-*')
-
-# choose the suitable branch
-target="master"
-
-for b in "${branches[@]}"; do
-    num=$(version_to_num "${b#*/pre-}")
-
-    if ((NANO_VER < num)); then
-        target="${b}"
-        break
-    fi
-done
-
-echo "Switching to branch ${target}"
-
-git checkout "${target}"
+echo "Current nano version: ${verstr}"
+echo "Switching to ${branch}"
+git checkout "${branch}"