Add utility to style gnome-terminal.

README.md

@@ -30,3 +30,11 @@ Run the following command:
 ```sh
 $ ln -s ~/dotfiles/tmux.conf ~/.tmux.conf
 ```
+
+## Configure gnome-terminal
+
+Run the following command:
+
+```sh
+$ ~/dotfiles/style-gnome-terminal.sh gruvbox8
+```

style-gnome-terminal.sh

@@ -0,0 +1,242 @@
+#!/bin/bash
+# vim: tw=80 ts=2 sw=2:
+
+set -eu
+
+ROOT_DCONF_DIR='/org/gnome/terminal/legacy/profiles:/'
+
+# ansi_colors COLOR1 ... COLOR16
+function ansi_colors() {
+  echo -n "['$1'"
+  for i in {2..16}; do    
+    echo -n ",'${!i}'"
+  done
+  echo "]"
+}
+
+# colorscheme NAME FG_COLOR BG_COLOR ANSI_COLORS
+function colorscheme() {
+  NAME="$1"
+  FG_COLOR="$2"
+  BG_COLOR="$3"
+  ANSI_COLORS="$4"
+
+  echo "${NAME};${FG_COLOR};${BG_COLOR};${ANSI_COLORS}"
+}
+
+function unpack_colorscheme_field(){
+  PACKED="$1"
+  FIELD="$2"
+  echo "${PACKED}" | cut -d ';' -f "${FIELD}"
+}
+
+# colorscheme_name COLORSCHEME
+function colorscheme_name() {
+  unpack_colorscheme_field "$1" 1
+}
+
+# colorscheme_fg_color COLORSCHEME
+function colorscheme_fg_color() {
+  unpack_colorscheme_field "$1" 2
+}
+
+# colorscheme_bg_color COLORSCHEME
+function colorscheme_bg_color() {
+  unpack_colorscheme_field "$1" 3
+}
+
+# colorscheme_ansi_colors COLORSCHEME
+function colorscheme_ansi_colors() {
+  unpack_colorscheme_field "$1" 4
+}
+
+GRUVBOX8_COLORSCHEME=$(colorscheme "gruvbox8" \
+    "#ebdbb2" \
+    "#1d2021" \
+    $(ansi_colors \
+        "#1d2021" \
+        "#cc241d" \
+        "#98971a" \
+        "#d79921" \
+        "#458588" \
+        "#b16286" \
+        "#689d6a" \
+        "#a89984" \
+        "#928374" \
+        "#fb4934" \
+        "#b8bb26" \
+        "#fabd2f" \
+        "#83a598" \
+        "#d3869b" \
+        "#8ec07c" \
+        "#ebdbb2"
+  )
+)
+
+COLORSCHEMES=(
+  "${GRUVBOX8_COLORSCHEME}"
+)
+
+# log ARGS...
+# echo for stderr
+function log() {
+  echo 1>&2 "$@"
+}
+
+# die ARGS...
+# log then exit with an error code
+function die() {
+  log "$@"
+  exit 1
+}
+
+function get_profile_property() {
+  PROFILE="$1"
+  PROPERTY="$2" 
+
+  dconf read "${PROFILE}${PROPERTY}"
+}
+
+# get_profile_name PROFILE
+# Echoes the human-readable name for a gnome-terminal profile subdirectory.
+function get_profile_name() {
+  get_profile_property "$1" "visible-name"
+}
+
+# choose_number BASE_PROMPT MIN MAX
+# Asks the user to choose a number between MIN and MAX, inclusive.
+# BASE_PROMPT should not end in a newline.
+function choose_number() {
+  PROMPT="$1"
+  MIN_NUMBER="$2"
+  MAX_NUMBER="$3"
+  while true; do
+    read -p "$1 [${MIN_NUMBER} to ${MAX_NUMBER}]: " CHOSEN_NUMBER
+    if [ "${CHOSEN_NUMBER}" -lt "${MIN_NUMBER}" ]; then
+      continue
+    fi
+    if [ "${CHOSEN_NUMBER}" -gt "${MAX_NUMBER}" ]; then
+      continue
+    fi
+
+    echo "${CHOSEN_NUMBER}"
+    break
+  done
+}
+
+# choose_profile
+# Echoes the path to a valid gnome-terminal profile to modify.
+function choose_profile() {
+  # Build an array of profile subdirectories.
+  PROFILES=()
+  for PROFILE_SUBDIR in $(dconf list "${ROOT_DCONF_DIR}"); do
+    PROFILES+=("${ROOT_DCONF_DIR}${PROFILE_SUBDIR}")
+  done
+  NUM_PROFILES="${#PROFILES[@]}"
+  
+  if [ "${NUM_PROFILES}" -eq 0 ]; then
+    die "Error: found no gnome-terminal profiles to style."
+  fi
+
+  if [ "${NUM_PROFILES}" -eq 1 ]; then
+    PROFILE="${PROFILES[0]}"
+    PROFILE_NAME=$(get_profile_name "${PROFILE}")
+    log "Found single gnome-terminal profile ${PROFILE_NAME}, using it."
+    echo "${PROFILE}"
+    return
+  fi
+
+  log "Available gnome-terminal profiles:"
+  
+  for i in $(seq 1 "${NUM_PROFILES}"); do
+    PROFILE="${PROFILES[$(($i - 1))]}"
+    PROFILE_NAME=$(get_profile_name "${PROFILE}")
+    log "  #$i: ${PROFILE_NAME}"
+  done
+
+  choose_number "Choose a profile" 1 "${NUM_PROFILES}"
+}
+
+# find_colorscheme COLORSCHEME_NAME
+# Echoes the colorscheme if it exists.
+# Dies otherwise with a useful message.
+function find_colorscheme() {
+  COLORSCHEME_NAME="$1"
+
+  NAMES=()
+  for COLORSCHEME in "${COLORSCHEMES[@]}"; do
+    NAME=$(colorscheme_name ${COLORSCHEME})
+    NAMES+=("${NAME}")
+
+    if [ "${NAME,,}" == "${NAME,,}" ]; then
+      echo "${COLORSCHEME}"
+      return
+    fi
+  done
+
+  log "Error: no such colorscheme '${COLORSCHEME_NAME}'. Options are:"
+  for NAME in "${NAMES[@]}"; do
+    log " - ${NAME}"
+  done
+  exit 1
+}
+
+# apply_colorscheme PROFILE COLORSCHEME
+# Applies the given packed colorscheme to the given gnome-terminal profile.
+function apply_colorscheme() {
+  PROFILE="$1"
+  COLORSCHEME="$2"
+
+  FG_COLOR=$(colorscheme_fg_color "${COLORSCHEME}")
+  BG_COLOR=$(colorscheme_bg_color "${COLORSCHEME}")
+  ANSI_COLORS=$(colorscheme_ansi_colors "${COLORSCHEME}")
+
+  dconf write "${PROFILE}foreground-color" "'${FG_COLOR}'"
+  dconf write "${PROFILE}background-color" "'${BG_COLOR}'"
+  dconf write "${PROFILE}palette" "${ANSI_COLORS}"
+}
+
+function main() {
+  if [ "$#" -le 0 ]; then
+    die "USAGE: style-gnome-terminal COLORSCHEME_NAME"
+  fi
+
+  # TODO: Subcommands:
+  # 
+  # Profiles:
+  # 
+  #  - profile list
+  #  - profile show NAME_OR_ID
+  # 
+  # Styling:
+  #
+  # These all take an optional [profile NAME_OR_ID] clause to specify a profile
+  # by name or UUID. If unspecified, the program searches for profiles. If there
+  # exists a single profile, the program uses it. Otherwise, an interactive
+  # choice is presented to the user.
+  #
+  #  - font get
+  #  - font set FONT
+  #  - foreground-color get
+  #  - foreground-color set COLOR
+  #  - background-color get
+  #  - background-color set COLOR
+  #  - palette get
+  #  - palette set COLORS
+  #  - colorscheme show NAME
+  #  - colorscheme apply NAME
+  #
+  # The colorscheme subcommand should probably read colorschemes from files
+  # instead, for easier integration with other people's colorschemes. Otherwise
+  # all colorschemes need to be defined in this script. The main question is the
+  # file format. We'd like something easy enough to write, that does not execute
+  # arbitrary code (rules our source-ing .sh files containing variables), that
+  # does not require onerous dependencies to parse.
+
+  COLORSCHEME_NAME="$1"
+  COLORSCHEME=$(find_colorscheme "${COLORSCHEME_NAME}")
+  PROFILE=$(choose_profile)
+  apply_colorscheme "${PROFILE}" "${COLORSCHEME}"
+}
+
+main "$@"