Fix update.zsh.erb for renamed HEAD remote branch

We need to fetch all branches first to handle the scenario when the HEAD
remote branch was renamed. Recently repositories started changing their
HEAD branch names from master to main.
Fixes #424

CHANGELOG.md

@@ -7,7 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
-_No unreleased changes._
+### Fixed
+- "Not a valid ref: refs/remotes/origin/main" error when the repository's default
+  branch was renamed to main.
 
 ## [1.4.1] - 2021-02-17
 

src/tools/update.zsh.erb

@@ -19,6 +19,10 @@ if [[ ${URL} != $(command git config --get remote.origin.url) ]]; then
   print -u2 -PR ${CLEAR_LINE}"%F{red}<%= error %>%B${MODULE}:%b URL does not match. Expected ${URL}. Will not try to update.%f"
   return 1
 fi
+if ! ERR=$(command git fetch -pq origin 2>&1); then
+  print -u2 -PR ${CLEAR_LINE}"%F{red}<%= error %>%B${MODULE}:%b Error during git fetch%f"$'\n'${(F):-  ${(f)^ERR}}
+  return 1
+fi
 if [[ ${TYPE} == tag ]]; then
   if [[ ${REV} == $(command git describe --tags --exact-match 2>/dev/null) ]]; then
     if (( PRINTLEVEL > 0 )) print -PR ${CLEAR_LINE}"<%= okay %>%B${MODULE}:%b Already up to date"
@@ -32,10 +36,6 @@ elif [[ -z ${REV} ]]; then
   fi
   REV=${$(command git symbolic-ref --short refs/remotes/origin/HEAD)#origin/} || return 1
 fi
-if ! ERR=$(command git fetch -pq origin ${REV} 2>&1); then
-  print -u2 -PR ${CLEAR_LINE}"%F{red}<%= error %>%B${MODULE}:%b Error during git fetch%f"$'\n'${(F):-  ${(f)^ERR}}
-  return 1
-fi
 if [[ ${TYPE} == branch ]]; then
   LOG_REV=${REV}@{u}
 else

src/zimfw.zsh.erb

@@ -6,7 +6,7 @@ class Zim
     @home = "${ZDOTDIR:-${HOME}}"
     @min_zsh_version = "5.2"
     @startup_files_glob = ".z(shenv|profile|shrc|login|logout)"
-    @version = "1.4.1"
+    @version = "1.4.2-SNAPSHOT"
     @ellipsis = " ..."
     @okay = "%F{green})%f "
     @warn = "! "

zimfw.zsh

@@ -319,7 +319,7 @@ _zimfw_compile() {
 }
 
 _zimfw_info() {
-  print -R 'zimfw version: '${_zversion}' (built at 2021-02-17 23:25:22 UTC, previous commit is 12dab4e)'
+  print -R 'zimfw version: '${_zversion}' (built at 2021-02-19 19:42:09 UTC, previous commit is ddfba96)'
   print -R 'ZIM_HOME:      '${ZIM_HOME}
   print -R 'Zsh version:   '${ZSH_VERSION}
   print -R 'System info:   '$(command uname -a)
@@ -366,7 +366,7 @@ _zimfw_upgrade() {
 }
 
 zimfw() {
-  local -r _zversion='1.4.1'
+  local -r _zversion='1.4.2-SNAPSHOT'
   local -r zusage="Usage: %B${0}%b <action> [%B-q%b|%B-v%b]
 
 Actions:
@@ -452,6 +452,10 @@ if [[ \${URL} != \$(command git config --get remote.origin.url) ]]; then
   print -u2 -PR \${CLEAR_LINE}\"%F{red}x %B\${MODULE}:%b URL does not match. Expected \${URL}. Will not try to update.%f\"
   return 1
 fi
+if ! ERR=\$(command git fetch -pq origin 2>&1); then
+  print -u2 -PR \${CLEAR_LINE}\"%F{red}x %B\${MODULE}:%b Error during git fetch%f\"$'\n'\${(F):-  \${(f)^ERR}}
+  return 1
+fi
 if [[ \${TYPE} == tag ]]; then
   if [[ \${REV} == \$(command git describe --tags --exact-match 2>/dev/null) ]]; then
     if (( PRINTLEVEL > 0 )) print -PR \${CLEAR_LINE}\"%F{green})%f %B\${MODULE}:%b Already up to date\"
@@ -465,10 +469,6 @@ elif [[ -z \${REV} ]]; then
   fi
   REV=\${\$(command git symbolic-ref --short refs/remotes/origin/HEAD)#origin/} || return 1
 fi
-if ! ERR=\$(command git fetch -pq origin \${REV} 2>&1); then
-  print -u2 -PR \${CLEAR_LINE}\"%F{red}x %B\${MODULE}:%b Error during git fetch%f\"$'\n'\${(F):-  \${(f)^ERR}}
-  return 1
-fi
 if [[ \${TYPE} == branch ]]; then
   LOG_REV=\${REV}@{u}
 else