Add version filtering support

There are some plugins that return prerelease versions.
Some other plugins don't return a unique list.

This change allows for ensuring lists are unique before passing it to
fzf.
It also allows for passing in custom filter commands.

Author: reegnz

README.md

@@ -2,19 +2,49 @@
 
 [asdf](https://github.com/asdf-vm/asdf) + [fzf](https://github.com/junegunn/fzf) = asdfzf!
 
-
 ## Installation
 
 Put the script on your path, eg.:
 
-```
+```sh
 mkdir -p ~/bin
-cp asdfzf ~/bin
-chmod +x ~/bin/asdfzf
+cd ~/bin
+wget https://raw.githubusercontent.com/reegnz/asdfzf/master/asdfzf
+chmod +x asdfzf
 ```
 
 ## Usage
 
 The asdfzf command hides asdf commands behind an fzf interactive selection interface.
 
 There are no arguments. Just run `asdfzf` and that's it!
+
+### Custom version filters per tool
+
+You can influence versions that display during install.
+
+Precedence of environment variables is:
+* ASDFZF_VERSION_FILTER_COMMAND_pluginname
+* ASDFZF_VERSION_KEEP_pluginname
+* ASDFZF_VERSION_FILTER_COMMAND
+* ASDFZF_VERSION_KEEP
+
+#### ASDFZF_VERSION_KEEP
+
+`ASDFZF_VERSION_KEEP=semver-no-prerelease` will keep versions that are
+not semver prerelease versions.
+
+`ASDFZF_VERSION_KEEP_kubectl=semver-only-prerelease` will only show semver
+prerelease versions
+
+#### ASDFZF_VERSION_KEEP_pluginname
+
+Same as `ASDFZF_VERSION_KEEP` but limited to a given plugin only.
+
+#### ASDFZF_VERSION_FILTER_COMMAND
+
+Allows for providing a custom shell command to filter the version strings.
+
+#### ASDFZF_VERSION_FILTER_COMMAND_pluginname
+
+Same as `ASDFZF_VERSION_FILTER_COMMAND` but limited to a given plugin only.

asdfzf

@@ -1,140 +1,192 @@
 #!/usr/bin/env bash
-
 set -euo pipefail
 
 __list_installed_plugins() {
-    asdf plugin-list 2>/dev/null | sort 
+    asdf plugin-list 2>/dev/null | sort
+}
+
+__select_installed_plugin() {
+    __list_installed_plugins | fzf
+}
+
+__color_installed() {
+    awk '
+        BEGIN {
+            green="\033[32m";
+            red="\033[31m";
+            reset="\033[0m";
+        }
+        /(installed)/{
+            print green $0 reset;
+            next;
+        }
+        {
+            print red $0 reset;
+        }'
 }
 
 __list_all_plugins() {
     join -t ' ' -a 1 \
-        <(asdf plugin-list-all 2>/dev/null | awk '{print $1}' | sort) \
-        <(__list_installed_plugins | awk '{print $1 " (installed)"}' | sort) |\
-        awk '
-            BEGIN {
-                green="\033[32m";
-                red="\033[31m";
-                reset="\033[0m";
-            }
-            /(installed)/{
-                print green $0 reset;
-                next;
-            }
-            {
-                print red $0 reset
-            }'
+        <( asdf plugin-list-all 2>/dev/null | awk '{print $1}' | sort ) \
+        <( __list_installed_plugins | awk '{print $1 " (installed)"}' | sort ) |
+        __color_installed
 }
 
+
+__list_current() {
+    asdf current 2>&1 | awk '{ print $1,$2 }' | column -t
+}
+
+
 __select_available_plugins() {
-    plugins=`__list_all_plugins`
-    cat <(echo "$plugins" | grep "installed") \
-        <(echo "$plugins" | grep -v "installed") | \
-    fzf -m --tac --ansi | awk '{print $1}'
+    plugins=$( __list_all_plugins )
+    cat <( echo "$plugins" | grep "installed" ) \
+        <( echo "$plugins" | grep -v "installed" ) |
+    fzf -m --tac --ansi | awk '{ print $1 }'
 }
 
 __select_installed_plugins() {
-    plugins=`__list_all_plugins`
-    cat <(echo "$plugins" | grep -v "installed") \
-        <(echo "$plugins" | grep "installed") | \
-    fzf -m --tac --ansi | awk '{print $1}'
+    plugins=$( __list_all_plugins )
+    cat <( echo "$plugins" | grep -v "installed" ) \
+        <( echo "$plugins" | grep "installed" ) |
+    fzf -m --tac --ansi | awk '{ print $1 }'
+}
+
+__version_filter() {
+    # Allow user-defined command to filter versions.
+    # Custom commands are either per tool with ASDFZF_VERSION_FILTER_COMMAND_plugin
+    # where plugin is the name of the plugin that installs the tool
+    # or defined globally with ASDFZF_VERSION_FILTER_COMMAND
+    #
+    # builtin filters are also selectable with ASDFZF_VERSION_FILTER_plugin
+    # and ASDFZF_VERSION_FILTER for global selection
+
+    varname="ASDFZF_VERSION_FILTER_COMMAND_$1"
+    if [[ -n "${!varname:-}" ]]; then
+        echo "${!varname}"
+        return
+    fi
+    varname="ASDFZF_VERSION_KEEP_$1"
+    if [[ -n "${!varname:-}" ]]; then
+        filter="${!varname}"
+    fi
+    if [[ -z "${filter:-}" ]]; then
+        if [[ -n "${ASDFZF_VERSION_FILTER_COMMAND:-}" ]]; then
+            echo "$ASDFZF_VERSION_FILTER_COMMAND"
+            return
+        fi
+        filter="${ASDFZF_VERSION_KEEP:-all}"
+    fi
+    case "$filter" in
+        all)
+            echo "cat"
+            ;;
+        semver-no-prerelease)
+            echo "sed -E -n '/^[0-9]+(\.[0-9]+)*(\+[0-9A-Za-z\.-]+)*$/p'"
+            ;;
+        semver-only-prerelease)
+            echo "sed -E -n '/^[0-9]+(\.[0-9]+)*-[0-9A-Za-z\.-]+(\+[0-9A-Za-z\.-]+)*/p'"
+            ;;
+        *)
+            echo "Unknown version filter: $filter" >&2
+            exit 1
+            ;;
+    esac
 }
 
 __list_all_versions() {
+    version_filter=$( __version_filter "$1" )
     join -t ' ' -a 1 \
-        <(asdf list-all $1 2>/dev/null | awk '{print $1}' | sort) \
-        <(asdf list $1 2>/dev/null | awk '{print $1 " (installed)"}' | sort) | \
-        sort -V | \
-        awk '
-            BEGIN {
-                green="\033[32m";
-                red="\033[31m";
-                reset="\033[0m";
-            }
-            /(installed)/{
-                print green $0 reset;
-                next;
-            }
-            {
-                print red $0 reset
-            }'
+        <( asdf list-all "$1" 2>/dev/null | awk '{print $1}' | eval "$version_filter" | sort ) \
+        <( asdf list "$1" 2>/dev/null | awk '{print $1}' | eval "$version_filter" | awk '{print $1 " (installed)"}' | sort ) | \
+        sort -V |
+        __color_installed
 }
 
 __list_installed_versions() {
-    __list_all_versions $1 | grep 'installed'
+    __list_all_versions "$1" | grep 'installed'
 }
 
 __select_installed_version() {
-    __list_installed_versions $1 | \
-    fzf --tac --ansi --no-sort | \
-    awk '{print $1}'
+    __list_installed_versions "$1" |
+    fzf --tac --ansi --no-sort |
+    awk '{ print $1 }'
 
 }
 
 __select_available_versions() {
-    versions=`__list_all_versions $1`
+    versions=$( __list_all_versions "$1" )
     cat <(echo "$versions" | grep "installed") \
         <(echo "$versions" | grep -v "installed") |\
-    fzf -m --tac --ansi --no-sort | awk '{print $1}'
+    fzf -m --tac --ansi --no-sort | awk '{ print $1 }'
 }
 
 __select_installed_versions() {
-    versions=`__list_all_versions $1`
+    versions=$( __list_all_versions "$1" )
     cat <(echo "$versions" | grep -v "installed") \
         <(echo "$versions" | grep "installed") |\
-    fzf -m --tac --ansi --no-sort | awk '{print $1}'
+    fzf -m --tac --ansi --no-sort | awk '{ print $1 }'
 }
 
 __get_current_version() {
     set +e
-    asdf current terraform | awk '{print $1}'
+    asdf current terraform | awk '{ print $1 }'
     set -e
 }
 
+__multi() {
+    xargs -t -r -n 1 "$@"
+}
+
 _install() {
-    plugin=`__list_installed_plugins | fzf`
-    __select_available_versions $plugin | xargs -t -r -n 1 asdf install $plugin
+    plugin=$( __select_installed_plugin )
+    __select_available_versions "$plugin" | __multi asdf install "$plugin"
 }
 
 _uninstall() {
-    plugin=`__list_installed_plugins | fzf`
-    __select_installed_versions $plugin | xargs -t -r -n 1 asdf uninstall $plugin
+    plugin=$( __select_installed_plugin )
+    __select_installed_versions "$plugin" | __multi asdf uninstall "$plugin"
 }
 
 _plugin-add() {
-    __select_available_plugins | xargs -t -r -n 1 asdf plugin-add
+    __select_available_plugins | __multi asdf plugin-add
 }
 
 _plugin-remove() {
-    __select_installed_plugins | xargs -t -r -n 1 asdf plugin-remove
+    __select_installed_plugins | __multi asdf plugin-remove
 }
 
+
 _list() {
-    plugin=`__list_installed_plugins | fzf`
-    __list_all_versions $plugin | grep installed
+    plugin=$( __select_installed_plugin )
+    __list_all_versions "$plugin" | grep installed
 }
 
 _list-all() {
-    plugin=`__list_installed_plugins | fzf`
-    __list_all_versions $plugin
+    plugin=$( __select_installed_plugin )
+    __list_all_versions "$plugin"
 }
 
 _global() {
-    plugin=`__list_installed_plugins | fzf`
-    __select_installed_version $plugin | xargs -t -r -n 1 asdf global $plugin
+    plugin=$( __select_installed_plugin )
+    version=$( __select_installed_version "$plugin" )
+    asdf global "$plugin" "$version"
 }
 
 _local() {
-    plugin=`__list_installed_plugins | fzf`
-    __select_installed_version $plugin | xargs -t -r -n 1 asdf local $plugin
+    plugin=$( __select_installed_plugin )
+    version=$( __select_installed_version "$plugin" )
+    asdf local "$plugin" "$version"
 }
 
 _current() {
-    asdf current 2>&1 | awk '{print $1,$2}' | column -t | fzf
+     __list_current | fzf
 }
 
 
-main() {
-    operation=$(cat <<-EOF | fzf
+
+__list_operations() {
+    cat <<-EOF
 install
 uninstall
 plugin-add
@@ -145,8 +197,15 @@ local
 global
 current
 EOF
-)
-    _$operation
+}
+
+__select_operation() {
+    __list_operations | fzf
+}
+
+main() {
+    operation=$(__select_operation)
+    "_$operation"
 }
 
 main